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0000-0003-4295-9730
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Optical Physics | Photonics, Optoelectronics and Optical Communications | Optics And Opto-Electronic Physics | Nanotechnology | Classical and Physical Optics | Quantum Optics And Lasers | Nanophotonics | Nanoscale Characterisation | Atomic And Molecular Physics | Curatorial and Related Studies | Photonics and Electro-Optical Engineering (excl. Communications) | Optical Properties of Materials | Nanochemistry and Supramolecular Chemistry | Theory and Design of Materials | Signal Transduction | Optical Physics Not Elsewhere Classified | Instruments And Techniques | Communications Technologies | Functional Materials | Physical Chemistry not elsewhere classified | Engineering/Technology Instrumentation | Fine Arts (Incl. Sculpture And Painting) | Medical Biotechnology Diagnostics (incl. Biosensors) | Condensed Matter Physics—Structural Properties | Optical properties of materials | Evolutionary biology | Broadband Network Technology | Macromolecular and Materials Chemistry | Optical And Photonic Systems | Biological physics | Materials Conservation | Other Physical Sciences | Materials Engineering Not Elsewhere Classified | Biological adaptation | Film And Video | Quantum Optics | Nanobiotechnology
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Physical Sciences | Physical sciences | Scientific instrumentation | Human Diagnostics | National Security | Expanding Knowledge in Technology | Expanding Knowledge in the Chemical Sciences | Telecommunications | Preserving movable cultural heritage | The creative arts | Emerging Defence Technologies | Crime Prevention | Information and Communication Services not elsewhere classified | Fabricated metal products not elsewhere classified | Health not elsewhere classified | Computer hardware and electronic equipment not elsewhere classified | Understanding other countries | Communication Networks and Services not elsewhere classified | Industrial instrumentation | Medical instrumentation | Photographic equipment | Medical Instruments | Expanding Knowledge in Engineering | Expanding Knowledge in the Biological Sciences |
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Publications
Single Cell Volume Measurement by Quantitative Phase Microscopy (QPM): A Case Study of Erythrocyte Morphology
Publisher: S. Karger AG
Date: 2006
DOI: 10.1159/000094124
Abstract: The measurement of the volume of intact, viable cells presents challenging problems in many areas of experimental and diagnostic science involved in the evaluation of cellular morphology, growth and function. This investigation details the implementation of a recently developed quantitative phase microscopy (QPM) method to measure the volume of erythrocytes under a range of osmotic conditions. QPM is a computational approach which utilizes simple bright field optics to generate cell phase maps which, together with knowledge of the cellular refractive index, may be used to measure cellular volume. Rat erythrocytes incubated in imidazole-buffered solutions (22 degrees C) of graded tonicity were analysed using QPM (n=10 cells/group, x63, 0.8 NA objective). Erythrocyte refractive index (1.367) was measured using a combination of phase and morphological data obtained from cells adopting spherical geometry under hypotonic conditions. Phase-computed volume increased with decreasing solution osmolality: 42.8 +/- 2.4, 48.7 +/- 2.3, 62.6 +/- 2.3, 90.8 +/- 7.7 microm3 in solutions of 540, 400, 240, and 170 mosmol/kg respectively. These volume changes were associated with crenated, bi-concave and spherical morphological states associated with increasing tonicity. This investigation demonstrates that QPM is a valid, simple and non-destructive approach for measuring cellular phase properties and volume. QPM cell volume analysis represents a significant advance in viable cell experimental capability and provides for acquisition of 'real-time' data - an option not previously available using other approaches.
An investigation of evanescent wave-induced fluorescence spectroscopy for exploring high refractive index media
Publisher: IOP Publishing
Date: 14-12-2022
Abstract: Evanescent wave-induced fluorescence spectroscopy (EWIFS) is a widely used technique for probing the interfacial behavior of different complex media in investigations of s les in the physical, chemical, and biological sciences. This technique takes advantage of the sharply decaying evanescent field, established following total internal reflection (TIR) at the interface of two media, for spatially identifying the photoluminescence characteristics of the s le. The generation of the evanescent field requires the refractive index of the second medium to be lower than that of the first, so a major disadvantage of this increasingly widely used spectroscopic technique is the inability to exploit the advantages of EWIFS to image a s le with a higher refractive index than the incident substrate medium. A proposed configuration in which a thin, low refractive index intermediate layer is established between the TIR substrate and a high refractive index s le is investigated. We illustrate that this arrangement does not afford the desired advantages of evanescent field-induced fluorescence measurements for investigating high refractive index media.
Atomic force microscopy for the determination of refractive index profiles of optical fibers and waveguides: A quantitative study
Publisher: AIP Publishing
Date: 15-09-1997
DOI: 10.1063/1.366103
Abstract: The use of preferential etching and atomic force microscopy to measure refractive index profiles of optical fibers is investigated. Both the etch rate and the position of lateral features are shown to be independent of etch time. An elliptical core fiber was studied and the resultant profile was found to be in qualitative agreement with the preform index profile. It is shown, however, that the ellipticity of the core has changed during the drawing process. The method was extended to fluorine and germanium doped planar waveguides and the results correlated with the fabrication process.
Coherence transport through imperfect x-ray optical systems
Publisher: The Optical Society
Date: 22-09-2003
DOI: 10.1364/OE.11.002323
Abstract: The latest generation of synchrotron sources, so-called third generation sources, are able to produce copious amounts of coherent radiation. However it has become evident that the experimental systems that have been developed are unable to fully utilize the coherent flux. This has led to a perception that coherence is lost while the radiation is transported down the beamline. However it is well established that the degree of coherence must be preserved, or increased, by an experimental system, and so this apparent "decoherence" must have its origin in the nature of the measurement process. In this paper we use phase space methods to present an argument that the loss of useful coherent flux can be attributed to unresolved speckle in the x-ray beam.
Three-dimensional refractive index reconstruction with quantitative phase tomography
Publisher: Wiley
Date: 2007
DOI: 10.1002/JEMT.20520
Abstract: Optical tomography based on quantitative phase microscopy is used to determine nondestructively and with high spatial resolution the three-dimensional (3D) refractive index distributions within optical fiber devices. After obtaining a series of phase images of the fiber as it is rotated around its longitudinal axis at regularly-spaced angular positions, filtered backprojection is used to reconstruct a 3D map of the refractive index. The 3D refractive index distribution of the join region between two fusion spliced optical fibers is reconstructed with accuracy better than 10(-3).
Index mapping for fibers with symmetric and asymmetric refractive index profiles
Publisher: The Optical Society
Date: 07-07-2008
DOI: 10.1364/OE.16.010912
Abstract: The application of phase imaging to refractive index profiling of an optical fiber slice is described. It is shown that the refractive index profile of axially symmetric and asymmetric optical fibers can be obtained from quantitative phase image of thin transverse optical fiber slices. Although this method requires careful and time consuming s le preparation, one advantage of this technique is that it can be applied to a wide range of optical fibers. In this paper results for both symmetric and non-symmetric fibers are presented and good agreement with the industry-standard refracted near-field technique demonstrated.
Optical properties of silver composite metamaterials
Publisher: Elsevier BV
Date: 05-2007
Planar focusing elements using spatially varying near-resonant aperture arrays
Publisher: Optica Publishing Group
Date: 18-05-2010
DOI: 10.1364/OE.18.011683
In‐Plane Detection of Guided Surface Plasmons for High‐Speed Optoelectronic Integrated Circuits
Publisher: Wiley
Date: 24-11-2017
Tunable nonlocal metasurfaces based on graphene for analogue optical computation
Publisher: Optica Publishing Group
Date: 28-04-2023
DOI: 10.1364/OME.484494
Abstract: Meta-optical devices have recently emerged as ultra-compact candidates for real-time computation in the spatial domain. The use of meta-optics for applications in image processing and wavefront sensing could enable an order of magnitude increase in processing speed and data throughput, while simultaneously drastically reducing the footprint of currently available solutions to enable miniaturisation. Most research to date has focused on static devices that can perform a single operation. Dynamically tunable devices, however, offer increased versatility. Here we propose graphene covered subwavelength silicon carbide gratings as electrically tunable optical computation and image processing devices at mid-infrared wavelengths.
Optical Janus Effect in Large Area Multilayer Plasmonic Films
Publisher: Wiley
Date: 28-01-2022
Abstract: Plasmonic and other nanoparticles have attracted considerable interest for their role in structural coloration. The optical “Janus” effect, where the color of light reflected from a partially transmitting film depends on whether the device is viewed from the substrate or the coating side, is observed using a variety of nanostructured films. Herein, the optical Janus effect produced by homogeneous thin‐film structures comprising only four layers of three different materials with a total thickness less than is demonstrated. An asymmetric Fabry–Perot (FP) nanocavity is formed with a dielectric film bounded by two different metal films of nanoscale thickness. The semitransparent device has a transmitted color that is independent of the viewing direction. A broad color palette is available through the selection of various thicknesses and film materials. In addition to the directional optical effect, the device possesses iridescence properties and can generate images by selective removal of regions of one of the metallic films using simple photolithography. From a manufacturing perspective, this device is scalable and holds significant promise for applications in architecture, producing decorative features, and the development of overt and covert security features.
Refractive index profiling of axially symmetric optical fibers: a new technique
Publisher: The Optical Society
Date: 2005
Abstract: We present a new technique for determining the refractive index profiles of axially symmetric optical fibers based on imaging phase gradients introduced into a transmitted optical field by a fiber s le. An image of the phase gradients within the field is obtained using a new non-interferometric technique based on bright field microscopy. This provides sufficient information to reconstruct the refractive index profile using the inverse Abel transform. The technique is robust, rapid and possesses high spatial resolution and we demonstrate its application to the reconstruction of the refractive index profiles of a single-mode and a multimode optical fiber.
Non-Destructive Three-Dimensional Optical Imaging of a Fiber Bragg Grating
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2014
Vanadium Dioxide based tunable plasmonic antennas
Publisher: IEEE
Date: 12-2012
Phase-sensitive imaging techniques applied to optical fibre characterisation
Publisher: Institution of Engineering and Technology (IET)
Date: 2006
Non-destructive three-dimensional index profiling of optical fibres and photonic devices
Publisher: IEEE
Date: 07-2006
Algorithm‐Designed Plasmonic Nanotweezers: Quantitative Comparison by Theory, Cathodoluminescence, and Nanoparticle Trapping
Publisher: Wiley
Date: 09-07-2021
Abstract: Plasmonic apertures permit optical fields to be concentrated into sub‐wavelength regions. This enhances the optical gradient force, enabling the precise trapping of nanomaterials such as quantum dots, proteins, and DNA molecules at modest laser powers. Double nanoholes, coaxial apertures, bowtie apertures, and other structures have been studied as plasmonic nanotweezers, with the design process generally comprising intuition followed by electromagnetic simulations with parameter sweeps. Here, instead, a computational algorithm is used to design plasmonic apertures for nanoparticle trapping. The resultant apertures have highly irregular shapes that, in combination with ring couplers also optimized by algorithm, are predicted to generate trapping forces more than an order of magnitude greater than those from the double nanohole design used as the optimization starting point. The designs are realized by fabricating precision apertures with a helium/neon ion microscope and are studied them by cathodoluminescence and optical trapping. It is shown that, at every laser intensity, the algorithm‐designed apertures can trap particles more tightly than the double nanohole.
Characterization of the coherence properties of different optical sources
Publisher: Springer Science and Business Media LLC
Date: 16-06-2017
Optical image processing with metasurface dark modes
Publisher: The Optical Society
Date: 22-08-2018
Real-Time Phase Imaging with an Asymmetric Transfer Function Metasurface
Publisher: American Chemical Society (ACS)
Date: 30-04-2022
Quantitative phase amplitude microscopy IV: imaging thick specimens
Publisher: Wiley
Date: 04-2004
Investigation of dopant profiles in erbium doped optical fibres by ion microprobe and fluorescence confocal microscopy
Publisher: IEEE
Date: 07-2006
Refractive index measurement in viable cells using quantitative phase-amplitude microscopy and confocal microscopy
Publisher: Wiley
Date: 2005
DOI: 10.1002/CYTO.A.20134
Abstract: The refractive index (RI) of cellular material provides fundamental biophysical information about the composition and organizational structure of cells. Efforts to describe the refractive properties of cells have been significantly impeded by the experimental difficulties encountered in measuring viable cell RI. In this report we describe a procedure for the application of quantitative phase microscopy in conjunction with confocal microscopy to measure the RI of a cultured muscle cell specimen. The experimental strategy involved calculation of cell thickness by using confocal optical sectioning procedures, construction of a phase map of the same cell using quantitative phase microscopy, and selection of cellular regions of interest to solve for the cell RI. Mean cell thickness and phase values for six cell regions (five cytoplasmic and one nuclear) were determined. The average refractive index calculated for cytoplasmic and nuclear regions was 1.360 +/- 0.004. The uncertainty in the final RI value represents the technique measurement error. The methodology we describe for viable cell RI measurement with this prototype cell has broad generic application in the study of cell growth and functional responses. The RI value we report may be used in optical analyses of cultured cell structure and morphology.
Deconstructed beetles: Bilayered composite materials produce green coloration with remarkably high near-infrared reflectance
Publisher: Elsevier BV
Date: 06-2023
Complete recovery of synchrotron wave fields using phase-space tomography and its applications in X-ray imaging
Publisher: IEEE
Date: 07-2006
Thin film notch filters as platforms for biological image processing
Publisher: Springer Science and Business Media LLC
Date: 18-03-2023
DOI: 10.1038/S41598-023-31528-5
Abstract: Many image processing operations involve the modification of the spatial frequency content of images. Here we demonstrate object-plane spatial frequency filtering utilizing the angular sensitivity of a commercial spectral bandstop filter. This approach to all-optical image processing is shown to generate real-time pseudo-3D images of transparent biological and other s les, such as human cervical cancer cells. This work demonstrates the potential of non-local, non-interferometric approaches to image processing for uses in label-free biological cell imaging and dynamical monitoring.
High-resolution phase imaging of phase singularities in the focal region of a lens
Publisher: The Optical Society
Date: 03-2002
DOI: 10.1364/OL.27.000345
Abstract: Subwavelength-resolution phase images of phase dislocations at the focal region of a 20x , 0.4-N.A. lens have been obtained by use of an optical fiber interferometer with a tapered probe in one arm. A phase-stepping algorithm is used to determine a quantitative value of the phase at each point in the scan, clearly showing the presence of edge dislocations between the Airy rings of the diffraction pattern near the lens focus, as well as four isolated screw-type singularties caused by astigmatism in the lens.
A General Method for Direct Assembly of Single Nanocrystals
Publisher: Wiley
Date: 28-05-2022
Abstract: Controlled nanocrystal assembly is a pre‐requisite for incorporation of these materials into solid state devices. Many assembly methods have been investigated which target precise nanocrystal positioning, high process controllability, scalability, and universality. However, most methods are unable to achieve all of these goals. Here, surface templated electrophoretic deposition (STED) is presented as a potential assembly method for a wide variety of nanocrystals. Controlled positioning and deposition of a wide range of nanocrystals into arbitrary spatial arrangements − including gold nanocrystals of different shapes and sizes, magnetic nanocrystals, fluorescent organic nanoparticles, and semiconductor quantum dots − is demonstrated. Nanoparticles with diameters nm are unable to be deposited due to their low surface charge and strong Brownian motion (low Péclet number). It is shown that this limit can be circumvented by forming clusters of nanocrystals or by silica coating nanocrystals to increase their effective size.
Tunable optical antennas enabled by the phase transition in vanadium dioxide
Publisher: The Optical Society
Date: 04-11-2013
DOI: 10.1364/OE.21.027503
Abstract: Optical antennas, subwavelength metallic structures resonating at visible frequencies, are a relatively new branch of antenna technology being applied in science, technology and medicine. Dynamically tuning the resonances of these antennas would increase their range of application and offer potential increases in plasmonic device efficiencies. Silver nanoantenna arrays were fabricated on a thin film of the phase change material vanadium dioxide (VO(2)) and the resonant wavelength of these arrays was modulated by increasing the temperature of the substrate above the critical temperature (approximately 68 °C). Depending on the array, wavelength modulation of up to 110 nm was observed.
Photoinduced Electron Transfer in the Strong Coupling Regime: Waveguide–Plasmon Polaritons
Publisher: American Chemical Society (ACS)
Date: 10-03-2016
DOI: 10.1021/ACS.NANOLETT.6B00310
Abstract: Reversible exchange of photons between a material and an optical cavity can lead to the formation of hybrid light-matter states where material properties such as the work function [ Hutchison et al. Adv. Mater. 2013 , 25 , 2481 - 2485 ], chemical reactivity [ Hutchison et al. Angew. Chem., Int. Ed. 2012 , 51 , 1592 - 1596 ], ultrafast energy relaxation [ Salomon et al. Angew. Chem., Int. Ed. 2009 , 48 , 8748 - 8751 Gomez et al. J. Phys. Chem. B 2013 , 117 , 4340 - 4346 ], and electrical conductivity [ Orgiu et al. Nat. Mater. 2015 , 14 , 1123 - 1129 ] of matter differ significantly to those of the same material in the absence of strong interactions with the electromagnetic fields. Here we show that strong light-matter coupling between confined photons on a semiconductor waveguide and localized plasmon resonances on metal nanowires modifies the efficiency of the photoinduced charge-transfer rate of plasmonic derived (hot) electrons into accepting states in the semiconductor material. Ultrafast spectroscopy measurements reveal a strong correlation between the litude of the transient signals, attributed to electrons residing in the semiconductor and the hybridization of waveguide and plasmon excitations.
Periodic array of nanoholes on gold-coated optical fiber end-faces for surface plasmon resonance liquid refractive index sensing
Publisher: SPIE
Date: 31-01-2012
DOI: 10.1117/12.915938
Cathodoluminescence as a probe of the optical properties of resonant apertures in a metallic film
Publisher: Beilstein Institut
Date: 18-05-2018
DOI: 10.3762/BJNANO.9.140
Abstract: Here we present the results of an investigation of resonances of azimuthal trimer arrangements of rectangular slots in a gold film on a glass substrate using cathodoluminescence (CL) as a probe. The variation in the CL signal collected from specific locations on the s le as a function of wavelength and the spatial dependence of emission into different wavelength bands provides considerable insight into the resonant modes, particularly sub-radiant modes, of these apertures. By comparing our experimental results with electromagnetic simulations we are able to identify a Fabry–Pérot mode of these cavities as well as resonances associated with the excitation of surface plasmon polaritons on the air–gold boundary. We obtain evidence for the excitation of dark (also known as sub-radiant) modes of apertures and aperture ensembles.
Quantitative phase microscopy: A new tool for investigating the structure and function of unstained live cells
Publisher: Wiley
Date: 12-2004
DOI: 10.1111/J.1440-1681.2004.04100.X
Abstract: 1. The optical transparency of unstained live cell specimens limits the extent to which information can be recovered from bright-field microscopic images because these specimens generally lack visible litude-modulating components. However, visualization of the phase modulation that occurs when light traverses these specimens can provide additional information. 2. Optical phase microscopy and derivatives of this technique, such as differential interference contrast (DIC) and Hoffman modulation contrast (HMC), have been used widely in the study of cellular materials. With these techniques, enhanced contrast is achieved, which is useful in viewing specimens, but does not allow quantitative information to be extracted from the phase content available in the images. 3. An innovative computational approach to phase microscopy, which provides mathematically derived information about specimen phase-modulating characteristics, has been described recently. Known as quantitative phase microscopy (QPM), this method derives quantitative phase measurements from images captured using a bright-field microscope without phase- or interference-contrast optics. 4. The phase map generated from the bright-field images by the QPM method can be used to emulate other contrast image modes (including DIC and HMC) for qualitative viewing. Quantitative phase microscopy achieves improved discrimination of cellular detail, which permits more rigorous image analysis procedures to be undertaken compared with conventional optical methods. 5. The phase map contains information about cell thickness and refractive index and can allow quantification of cellular morphology under experimental conditions. As an ex le, the proliferative properties of smooth muscle cells have been evaluated using QPM to track growth and confluency of cell cultures. Quantitative phase microscopy has also been used to investigate erythrocyte cell volume and morphology in different osmotic environments. 6. Quantitative phase microscopy is a valuable, new, non-destructive, non-interventional experimental tool for structural and functional cellular investigations.
Quantitative phase tomography
Publisher: Elsevier BV
Date: 03-2000
Material effects on V-nanoantenna performance
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4NR06650B
Abstract: Aluminum V-antennas on silicon display significant alterations to their plasmon resonances due to the presence of the optically-dense silicon substrate and adjacent antennas, as well as a high sensitivity to the substrate's native oxide layer. The effect of the aluminium band-gap is also shown to affect the V-antennas’ resonances.
Metal-free scanning optical microscopy with a fractal fiber probe
Publisher: Optica Publishing Group
Date: 29-01-2009
DOI: 10.1364/OE.17.001772
Abstract: Scanning Near-field Optical Microscopy (SNOM) is the leading instrument used to image optical fields on the nanometer scale. A metal-coating is typically applied to SNOM probes to define a subwavelength aperture and minimize optical leakage, but the presence of such coatings in the near field of the s le can often cause a substantial change in the s le emission properties. For the first time, the authors demonstrate near-field imaging on a metal substrate with a metal-free probe made from a novel structured optical fiber, designed to maximize optical throughput and potentially remove the need for the metal.
Nanophotonics enhanced coverslip for phase imaging in biology
Publisher: Springer Science and Business Media LLC
Date: 08-05-2021
DOI: 10.1038/S41377-021-00540-7
Abstract: The ability to visualise transparent objects such as live cells is central to understanding biological processes. Here we experimentally demonstrate a novel nanostructured coverslip that converts phase information to high-contrast intensity images. This compact device enables real-time, all-optical generation of pseudo three-dimensional images of phase objects on transmission. We show that by placing unstained human cancer cells on the device, the internal structure within the cells can be clearly seen. Our research demonstrates the significant potential of nanophotonic devices for integration into compact imaging and medical diagnostic devices.
Metasurfaces, dark modes, and high NA illumination
Publisher: The Optical Society
Date: 11-10-2018
Ultracompact Camera Pixel with Integrated Plasmonic Color Filters
Publisher: Wiley
Date: 17-09-2019
<title>Imaging of near-field diffraction patterns with subwavelength resolution in the optical region</title>
Publisher: SPIE
Date: 02-1992
DOI: 10.1117/12.134884
Metasurfaces with Asymmetric Optical Transfer Functions for Optical Signal Processing
Publisher: American Physical Society (APS)
Date: 07-2019
Optical tomographic reconstruction of ion beam induced refractive index changes in silica
Publisher: AIP Publishing
Date: 29-10-2007
DOI: 10.1063/1.2794785
Abstract: Refractive index changes induced by ion beam implantation can be used to produce photonic devices such as waveguides. Here, we relate the measured three-dimensional changes in refractive index produced by ion beam implantation to modeling of the implantation process. We use a quantitative phase microscopic method in conjunction with a tomographic reconstruction process to determine the change in the refractive index distribution within a silica optical fiber that has been selectively implanted with 2.4MeV H+ ions. The index profile is compared with numerical simulations of the ion vacancy and ionization using the stopping range of ions in matter program.
Quantitative polarized phase microscopy for birefringence imaging
Publisher: Optica Publishing Group
Date: 2007
DOI: 10.1364/OE.15.017690
Abstract: A novel application of quantitative phase imaging under linearly polarized light is introduced for studying unstained anisotropic live cells. The method is first validated as a technique for mapping the two-dimensional retardation distribution of a well-characterized optical fiber and is then applied to the characterization of unstained isolated cardiac cells. The experimental retardation measurements are in very good agreement with the established Brace-Köhler method, and additionally provide spatially resolved cell birefringence and phase data.
Probing the erbium ion distribution in silica optical fibers with fluorescence based measurements
Publisher: Elsevier BV
Date: 11-2011
Phase space density measurement of interfering X-rays
Publisher: Elsevier BV
Date: 06-2005
Correlated imaging visibility using a parametric downconversion source seeded with partially coherent stimulation
Publisher: Optica Publishing Group
Date: 14-05-2009
Plasmonic Near-Complete Optical Absorption and Its Applications
Publisher: Wiley
Date: 02-05-2019
Fabrication, modeling, and direct evanescent field measurement of tapered optical fiber sensors
Publisher: AIP Publishing
Date: 04-1999
DOI: 10.1063/1.369695
Abstract: Tapered optical fibers have been fabricated using a flame elongation technique. The evanescent field distribution surrounding the taper region has been measured directly using a scanning near field optical microscope and results are found to be in good agreement with predictions made using a finite difference beam propagation method.
Precision measurement of the electromagnetic fields in the focal region of a high-numerical-aperture lens using a tapered fiber probe
Publisher: The Optical Society
Date: 08-2002
Abstract: We present a measurement of the intensity around the focus of a N.A.-0.95 lens using a tapered optical fiber probe. An asymmetry introduced by the vector nature of the incident polarized light is evident, although it is inconsistent with that predicted theoretically by considering the magnitude squared of the electric field. The sensitivity of the probe to different components of the electromagnetic field is considered, and it is shown that the measurement is consistent with vector diffraction theory when the probe properties are taken into account.
Switchable polarization rotation of visible light using a plasmonic metasurface
Publisher: AIP Publishing
Date: 29-11-2016
DOI: 10.1063/1.4968840
Abstract: A metasurface comprising an array of silver nanorods supported by a thin film of the phase change material vanadium dioxide is used to rotate the primary polarization axis of visible light at a pre-determined wavelength. The dimensions of the rods were selected such that, across the two phases of vanadium dioxide, the two lateral localized plasmon resonances (in the plane of the metasurface) occur at the same wavelength. Illumination with linearly polarized light at 45° to the principal axes of the rod metasurface enables excitation of both of these resonances. Modulating the phase of the underlying substrate, we show that it is possible to reversibly switch which axis of the metasurface is resonant at the operating wavelength. Analysis of the resulting Stokes parameters indicates that the orientation of the principal linear polarization axis of the reflected signal is rotated by 90° around these wavelengths. Dynamic metasurfaces such as these have the potential to form the basis of an ultra-compact, low-energy multiplexer or router for an optical signal.
Characterisation of scattered fields in phase-space
Publisher: IEEE
Date: 07-2006
Refractive-index profiling of optical fibers with axial symmetry by use of quantitative phase microscopy
Publisher: The Optical Society
Date: 12-2002
DOI: 10.1364/OL.27.002061
Abstract: The application of quantitative phase microscopy to refractive-index profiling of optical fibers is demonstrated. Phase images of axially symmetric optical fibers immersed in index-matching fluid are obtained, and the inverse Abel transform is used to obtain the radial refractive-index profile. This technique is straightforward, nondestructive, repeatable, and accurate. Excellent agreement, to within approximately 0.0005, between this method and the index profile obtained with a commercial profiler is obtained.
Application of ESPI to painted canvas
Publisher: IEEE
Date: 07-2006
Reflections near 1030 nm from 1540 nm fibre Bragg gratings: Evidence of a complex refractive index structure
Publisher: Elsevier BV
Date: 12-2005
<title>Near-field probe interaction with an optical fiber taper</title>
Publisher: SPIE
Date: 13-10-1998
DOI: 10.1117/12.326809
Synchrotron beam coherence: A spatially resolved measurement
Publisher: The Optical Society
Date: 15-01-2005
DOI: 10.1364/OL.30.000204
Abstract: We report a precise and spatially resolved measurement of the complex degree of coherence of a one-dimensional 1.5-keV beam produced by a third-generation synchrotron source. The method of phase-space tomography is used, which requires only measurements of the x-ray intensity. We find that the field is statistically stationary to within experimental error, the correlations are very well approximated by a Gaussian distribution, and the measured coherence length is in excellent agreement with expectations.
Measurement of an elliptical fiber mode field using near-field microscopy
Publisher: AIP Publishing
Date: 06-1995
DOI: 10.1063/1.359255
Abstract: Near-field scanning optical microscopy is used to determine the field structure within a noncircularly symmetric optical fiber. The output from an elliptical core fiber is measured and found to be in good agreement with the field predicted using a point matching method and fiber parameters determined from the preform.
Hot-Carrier Organic Synthesis via the Near-Perfect Absorption of Light
Publisher: American Chemical Society (ACS)
Date: 26-09-2018
2‐nm‐Thick Indium Oxide Featuring High Mobility
Publisher: Wiley
Date: 25-02-2023
Abstract: Thin film transistors (TFTs) are key components for the fabrication of electronic and optoelectronic devices, resulting in a push for the wider exploration of semiconducting materials and cost‐effective synthesis processes. In this report, a simple approach is proposed to achieve 2‐nm‐thick indium oxide nanosheets from liquid metal surfaces by employing a squeeze printing technique and thermal annealing at 250 °C in air. The resulting materials exhibit a high degree of transparency ( %) and an excellent electron mobility of ≈96 cm 2 V −1 s −1 , surpassing that of pristine printed 2D In 2 O 3 and many other reported 2D semiconductors. UV‐detectors based on annealed 2D In 2 O 3 also benefit from this process step, with the photoresponsivity reaching 5.2 × 10 4 and 9.4 × 10 3 A W −1 at the wavelengths of 285 and 365 nm, respectively. These values are an order of magnitude higher than for as‐synthesized 2D In 2 O 3 . Utilizing transmission electron microscopy with in situ annealing, it is demonstrated that the improvement in device performances is due to nanostructural changes within the oxide layers during annealing process. This work highlights a facile and ambient air compatible method for fabricating high‐quality semiconducting oxides, which will find application in emerging transparent electronics and optoelectronics.
Simultaneous multidopant investigation of rare-earth-doped optical fibers by an ion microprobe
Publisher: The Optical Society
Date: 26-10-2006
DOI: 10.1364/OL.31.003258
Abstract: The relative distribution of five elements present in the core area of several optical fiber s les has been obtained by utilizing nanoscale-secondary ion mass spectrometry. A strong correlation between the rare-earth (RE) ion and aluminum was observed, consistent with aluminum's improving the solubility of the RE ion. The central dip in distribution was less severe than that observed for germanium, characteristic of the collapse process during fabrication of the fiber preform.
Contributed Review: A review of the investigation of rare-earth dopant profiles in optical fibers
Publisher: AIP Publishing
Date: 04-2016
DOI: 10.1063/1.4947066
Abstract: Rare-earth doped optical fibers have captivated the interest of many researchers around the world across the past three decades. The growth of this research field has been stimulated primarily through their application in optical communications as fiber lasers and lifiers, although rare-earth doped optical fiber based devices are now finding important uses in many other scientific and industrial areas (for ex le, medicine, sensing, the military, and material processing). Such wide commercial interest has provided a strong incentive for innovative fiber designs, alternative glass compositions, and novel fabrication processes. A prerequisite for the ongoing progress of this research field is developing the capacity to provide high resolution information about the rare-earth dopant distribution profiles within the optical fibers. This paper constitutes a comprehensive review of the imaging techniques that have been utilized in the analysis of the distribution of the rare-earth ion erbium within the core of optical fibers.
Optical investigation of the J-pole and Vee antenna families
Publisher: The Optical Society
Date: 14-01-2014
DOI: 10.1364/OE.22.001336
Dual resonance mechanisms facilitating enhanced optical transmission in coaxial waveguide arrays
Publisher: The Optical Society
Date: 11-04-2008
DOI: 10.1364/OL.33.000821
Abstract: We experimentally and computationally demonstrate high transmission through arrays of coaxial apertures with different geometries and arrangements in silver films. By studying both periodic and random arrangements of apertures, we were able to isolate transmission enhancement phenomena owing to surface plasmon effects from those owing to the excitation of cylindrical surface plasmons within the apertures themselves.
Comparison between a simulated and measured image of a fibre Bragg grating
Publisher: IEEE
Date: 07-2006
Large-Area Nanofabrication of Partially Embedded Nanostructures for Enhanced Plasmonic Hot-Carrier Extraction
Publisher: American Chemical Society (ACS)
Date: 25-02-2019
Modelling structural colour from helicoidal multi-layer thin films with natural disorder
Publisher: Optica Publishing Group
Date: 16-10-2023
DOI: 10.1364/OE.503881
Plasmonic Colour Filters Based on Coaxial Holes in Aluminium
Publisher: MDPI AG
Date: 04-04-2017
DOI: 10.3390/MA10040383
Mode profile modification of H+ ion beam irradiated waveguides using UV processing
Publisher: Elsevier BV
Date: 10-1998
X-ray imaging: a generalized approach using phase-space tomography
Publisher: The Optical Society
Date: 08-2005
Abstract: We discuss the role of coherence in x-ray imaging and consider how phase-space tomography can be used to extract information about partial coherence. We describe the application of phase-space tomography to x-ray imaging and recover the spatial coherence properties of a one-dimensional soft (1.5 keV) x-ray beam from a synchrotron undulator source. We present phase-space information from a Young's experiment and observe negative regions in the quasi-probability distribution. We show that, given knowledge of the coherence of the beam, we can use partially coherent diffraction data to recover fully coherent information, and we present some simple experimental demonstrations of this capability.
Simultaneous dual-contrast three-dimensional imaging in live cells via optical diffraction tomography and fluorescence
Publisher: The Optical Society
Date: 14-08-2019
DOI: 10.1364/PRJ.7.001042
Plasmonic lenses for wavefront control applications using two-dimensional nanometric cross-shaped aperture arrays
Publisher: The Optical Society
Date: 28-02-2011
Modeling of classical ghost images formed using pseudo-thermal light sources
Publisher: SPIE
Date: 13-09-2007
DOI: 10.1117/12.732246
Extraordinary optical transmission with coaxial apertures
Publisher: AIP Publishing
Date: 18-06-2007
DOI: 10.1063/1.2751120
Abstract: Recently it has been predicted that “cylindrical” surface plasmons (CSP’s) on cylindrical interfaces of coaxial ring apertures produce a different form of extraordinary optical transmission that extends to ever increasing wavelengths as the dielectric ring narrows. This letter presents experimental confirmation of this CSP assisted extraordinary transmission. Nanoarrays of submicron coaxial apertures are fabricated in a thin silver film on a glass substrate and far-field transmission spectra are measured. The experimental spectrum is in close agreement with predictions from finite-difference time-domain simulations and CSP dispersion theory. The role of cylindrical surface plasmons in producing extraordinary transmission is thus confirmed.
Thin film notch filters as platforms for biological image processing
Publisher: arXiv
Date: 2022
Plasmonic Lenses Formed by Two-Dimensional Nanometric Cross-Shaped Aperture Arrays for Fresnel-Region Focusing
Publisher: American Chemical Society (ACS)
Date: 19-04-2010
DOI: 10.1021/NL1009712
Abstract: We present the experimental demonstration of what are to our knowledge the first two-dimensional planar plasmonic lenses formed by an array of spatially varying cross-shaped apertures in a metallic film for Fresnel-region focusing. The design utilizes localized surface plasmon resonances occurring inside the apertures, accompanied by an aperture geometry dependent phase shift, to achieve the desired spatial phase modulation in the transmitted field. The performance of lenses with different design configurations was evaluated using a confocal scanning optical microscope, and the effects of diffraction on the optical response of these microscale devices are discussed.
Vanadium dioxide thickness effects on tunable optical antennas
Publisher: SPIE
Date: 07-12-2013
DOI: 10.1117/12.2033739
Evanescent field characterisation of tapered optical fibre sensors in liquid environments using near field scanning optical microscopy and atomic force microscopy
Publisher: Institution of Engineering and Technology (IET)
Date: 10-1999
Luminescence of a Transition Metal Complex Inside a Metamaterial Nanocavity
Publisher: Wiley
Date: 22-06-2017
Abstract: Modification of the local density of optical states using metallic nanostructures leads to enhancement in the number of emitted quanta and photocatalytic turnover of luminescent materials. In this work, the fabrication of a metamaterial is presented that consists of a nanowire separated from a metallic mirror by a polymer thin film doped with a luminescent organometallic iridium(III) complex. The large spin-orbit coupling of the heavy metal atom results in an excited state with significant magnetic-dipole character. The nanostructured architecture supports two distinct optical modes and their assignment achieved with the assistance of numerical simulations. The simulations show that one mode is characterized by strong confinement of the electric field and the other by strong confinement of the magnetic field. These modes elicit drastic changes in the emitter's photophysical properties, including dominant nanocavity-derived modes observable in the emission spectra along with significant increases in emission intensity and the total decay rate. A combination of simulations and momentum-resolved spectroscopy helps explain the mechanism of the different interactions of each optical mode supported by the metamaterial with the excited state of the emitter.
Fabrication of buried channel waveguides in fused silica by focused MeV ion-beam irradiation
Publisher: SPIE
Date: 10-01-1996
DOI: 10.1117/12.229968
Quantitative phase and refractive index analysis of optical fibers using differential interference contrast microscopy
Publisher: The Optical Society
Date: 26-09-2008
DOI: 10.1364/AO.47.005182
Abstract: A systematic and straightforward image processing method to extract quantitative phase and refractive index data from weak phase objects is presented, obtained using differential interference contrast (DIC) microscopy. The method is demonstrated on DIC images of optical fibers where a directional integration routine is applied to the DIC images to extract phase and refractive index information using the data obtained across the whole DIC image. By applying the inverse Abel transform to the resultant phase images, an accurate refractive index profile is obtained. The method presented here is compared to the refracted near-field technique, typically used to obtain the refractive index profile of optical fibers, and shows excellent agreement. It is concluded that through careful image processing procedures, DIC microscopy can be successfully implemented to obtain quantitative phase and refractive index information of optical fibers.
Meta-optical and thin film devices for all-optical information processing
Publisher: AIP Publishing
Date: 19-08-2021
DOI: 10.1063/5.0048758
Abstract: All-optical spatial frequency filtering has a long history with many applications now commonly replaced with digital alternatives. Although optical approaches are attractive in that they minimize energy requirements and images can be manipulated in real time, they are relatively bulky compared to the compact electronic devices that are now ubiquitous. With emerging interest in nanophotonic approaches to all-optical information processing, these approaches to enhancing images and performing phase visualization are attracting significant interest. Metasurfaces have been demonstrated as tailored alternatives to conventional spatial filters, but utilizing the spatial frequency sensitivity of these and thin film devices also has the potential to form the basis for ultracompact approaches to image processing. There are, however, significant challenges remaining to realize this promise. This review summarizes the current status of research in this rapidly growing field, places it in the context of the history of all-optical spatial filtering, and assesses prospects for future directions.
Modelling of classical ghost images obtained using scattered light
Publisher: IOP Publishing
Date: 24-08-2007
Indium tin oxide film characterization using the classical Hall Effect
Publisher: IEEE
Date: 12-2014
Experimental measurement of the four-dimensional coherence function for an undulator x-ray source
Publisher: American Physical Society (APS)
Date: 30-05-2007
Broadband chirality-coded meta-aperture for photon-spin resolving
Publisher: Springer Science and Business Media LLC
Date: 02-12-2015
DOI: 10.1038/NCOMMS10051
Abstract: The behaviour of light transmitted through an in idual subwavelength aperture becomes counterintuitive in the presence of surrounding ‘decoration’, a phenomenon known as the extraordinary optical transmission. Despite being polarization-sensitive, such an in idual nano-aperture, however, often cannot differentiate between the two distinct spin-states of photons because of the loss of photon information on light-aperture interaction. This creates a ‘blind-spot’ for the aperture with respect to the helicity of chiral light. Here we report the development of a subwavelength aperture embedded with metasurfaces dubbed a ‘meta-aperture’, which breaks this spin degeneracy. By exploiting the phase-shaping capabilities of metasurfaces, we are able to create specific meta-apertures in which the pair of circularly polarized light spin-states produces opposite transmission spectra over a broad spectral range. The concept incorporating metasurfaces with nano-apertures provides a venue for exploring new physics on spin-aperture interaction and potentially has a broad range of applications in spin-optoelectronics and chiral sensing.
Fabrication of long-period fiber gratings by use of focused ion-beam irradiation
Publisher: Optica Publishing Group
Date: 06-2001
DOI: 10.1364/OL.26.000765
Abstract: Long-period gratings have been made in nonphotosensitive optical fibers by irradiation of the core of a fiber with a focused beam of high-energy protons. The irradiated fibers exhibit relatively low loss, even before thermal annealing, and possess strongly wavelength-dependent transmission. The absence of a mask provides the opportunity to tailor the grating to a desired profile, and a variety of grating profiles were explored. The profile most resembling a sinusoid was found to produce the cleanest transmission spectra.
Phase retrieval with the transport-of-intensity equation: matrix solution with use of Zernike polynomials
Publisher: Optica Publishing Group
Date: 09-1995
The plasmonic J-pole antenna
Publisher: AIP Publishing
Date: 21-01-2013
DOI: 10.1063/1.4775382
Abstract: The plasmonic J-pole antenna is the nanoscale version of a radio frequency design, consisting of a half wavelength arm connected to a quarter wavelength feed pair. Here, we report on an optical J-pole antenna that displays both a dipole (1015 nm) and quadrupole resonance (653 nm). The excitation of the quadrupole resonance is optimum at an angle of incidence directly related to the geometry of the antenna, demonstrating the flexibility of the design. The J-pole antenna shows great promise for enhancing and shaping the angular emission pattern of quantum emitters.
Micro-characterisation of erbium-doped fibers using a Raman confocal microscope
Publisher: The Optical Society
Date: 2005
Abstract: We demonstrate the application of a Fluorescence Intensity Confocal Optical Microscopy technique to the determination of the relative erbium ion distribution in optical fibers. As well as being able to acquire two dimensional profiles of the relative erbium ion distribution, this method can also provide valuable information on a sub-micron level regarding physical and optogeometric parameters of the examined s les.
Tuning of Plasmonic Resonances in the Near Infrared Spectrum Using a Double Coaxial Aperture Array
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2018
Imaging through turbid media based on wave transport model approach
Publisher: Optica Publishing Group
Date: 11-12-2008
DOI: 10.1364/OE.16.021389
Sub-wavelength characterisation of optical focal structures
Publisher: Elsevier BV
Date: 1998
Modeling of gold circular sub-wavelength apertures on a fiber endface for refractive index sensing?
Publisher: Springer Science and Business Media LLC
Date: 10-07-2012
Hot Carrier Extraction with Plasmonic Broadband Absorbers
Publisher: American Chemical Society (ACS)
Date: 21-03-2016
Abstract: Hot charge carrier extraction from metallic nanostructures is a very promising approach for applications in photocatalysis, photovoltaics, and photodetection. One limitation is that many metallic nanostructures support a single plasmon resonance thus restricting the light-to-charge-carrier activity to a spectral band. Here we demonstrate that a monolayer of plasmonic nanoparticles can be assembled on a multistack layered configuration to achieve broadband, near-unit light absorption, which is spatially localized on the nanoparticle layer. We show that this enhanced light absorbance leads to ∼40-fold increases in the photon-to-electron conversion efficiency by the plasmonic nanostructures. We developed a model that successfully captures the essential physics of the plasmonic hot electron charge generation and separation in these structures. This model also allowed us to establish that efficient hot carrier extraction is limited to spectral regions where (i) the photons have energies higher than the Schottky junctions and (ii) the absorption of light is localized on the metal nanoparticles.
Black Gold: Broadband, High Absorption of Visible Light for Photochemical Systems
Publisher: Wiley
Date: 28-11-2017
Quantitative optical phase microscopy
Publisher: The Optical Society
Date: 06-1998
DOI: 10.1364/OL.23.000817
Abstract: We present a new method for the extraction of quantitative phase data from microscopic phase s les by use of partially coherent illumination and an ordinary transmission microscope. The technique produces quantitative images of the phase profile of the s le without phase unwrapping. The technique is able to recover phase even in the presence of litude modulation, making it significantly more powerful than existing methods of phase microscopy. We demonstrate the technique by providing quantitatively correct phase images of well-characterized test s les and show that the results obtained for more-complex s les correlate with structures observed with Nomarski differential interference contrast techniques.
Complete characterization of a high-numerical-aperture small-core fiber with subwavelength resolution using atomic force microscopy and near-field scanning optical microscopy
Publisher: SPIE-Intl Soc Optical Eng
Date: 07-2003
DOI: 10.1117/1.1576221
Nanometers to centimeters: Novel optical nano-antennas, with an eye to scaled production
Publisher: SPIE
Date: 14-03-2016
DOI: 10.1117/12.2210769
Phase-space Tomographic Characterization of the Spatial Coherence Properties of Scattered Fields
Publisher: OSA
Date: 2005
Surface plasmon hybridization and exciton coupling
Publisher: American Physical Society (APS)
Date: 09-07-2012
Investigation of erbium dopant distribution in silica optical fibers with fluorescence-based measurements using a near-field scanning microscope
Publisher: SPIE-Intl Soc Optical Eng
Date: 05-12-2014
Quantitative investigation of the refractive-index modulation within the core of a fiber Bragg grating
Publisher: Optica Publishing Group
Date: 2006
DOI: 10.1364/OE.14.010332
Abstract: A comparison is made between the modeled and experimentally determined microscopic images of a type I Bragg grating produced in the core of an optical fiber using the ultraviolet irradiation of a phase mask. The simulated image of the refractive-index distribution, which assumes a linear relationship between the irradiation intensity and the refractive-index change, is in good agreement with the measured image.
Field characterization of a D-shaped optical fiber using scanning near-field optical microscopy
Publisher: AIP Publishing
Date: 15-07-1997
DOI: 10.1063/1.365608
Abstract: Scanning near-field optical microscopy is used to measure the mode profile and evanescent field of a Ge-doped D-shaped optical fiber. The structure of the fiber is determined by differential etching followed by an investigation of the resultant topography with an atomic force microscope. This information is then used to theoretically model the expected behavior of the fiber and it is shown that the theoretical results are in excellent agreement with the experimentally observed field.
Characterization of optical fibers using near-field scanning optical microscopy
Publisher: AIP Publishing
Date: 15-03-1994
DOI: 10.1063/1.356212
Abstract: A method of determining the field distribution within an optical fiber of arbitrary refractive index profile using near-field scanning optical microscopy is described. The 3D intensity distribution emerging from the end of a cleaved fiber is measured by scanning a subwavelength aperture through the distribution, and the field within the fiber is inferred from this information. In the case of a single-mode step-index fiber, results are found to agree with a Gaussian modal distribution.
Collective excitation of plasmonic hot-spots for enhanced hot charge carrier transfer in metal/semiconductor contacts
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR01592H
Abstract: We show how a combination of near- and far-field coupling of the localised surface plasmon resonances in aluminium nanoparticles deposited on TiO2 films greatly enhances the visible light photocatalytic activity of the semiconductor material. We demonstrate two orders of magnitude enhancement in the rate of decomposition of methylene blue under visible light illumination when the surface of TiO2 films is decorated with gratings of Al nanoparticle dimers.
Partially coherent fields, the transport-of-intensity equation, and phase uniqueness
Publisher: Optica Publishing Group
Date: 09-1995
Optical properties of nanoscale annular array metamaterials
Publisher: SPIE
Date: 31-08-2006
DOI: 10.1117/12.679210
Selective near-perfect absorbing mirror as a spatial frequency filter for optical image processing
Publisher: AIP Publishing
Date: 10-2019
DOI: 10.1063/1.5113650
Abstract: Spatial frequency filtering is a fundamental enabler of information processing methods in biological and technical imaging. Most filtering methods, however, require either bulky and expensive optical equipment or some degree of computational processing. Here, we experimentally demonstrate real-time, on-chip, all-optical spatial frequency filtering using a thin-film perfect absorber structure. We experimentally demonstrate edge enhancement of an litude image and conversion of phase gradients to intensity modulation in an image. The device is used to demonstrate enhancement of an image of pond algae.
Plasmonic nanoresonant materials
Publisher: SPIE
Date: 21-12-2007
DOI: 10.1117/12.772641
High spatial resolution optical fibre mode profiling
Publisher: Institution of Engineering and Technology (IET)
Date: 2004
DOI: 10.1049/EL:20040543
Plasmene Metasurface Absorbers: Electromagnetic Hot Spots and Hot Carriers
Publisher: American Chemical Society (ACS)
Date: 22-01-2019
A generalized approach to characterize optical properties of natural objects
Publisher: Oxford University Press (OUP)
Date: 25-09-2022
DOI: 10.1093/BIOLINNEAN/BLAC064
Abstract: To understand the ersity of ways in which natural materials interact with light, it is important to consider how their reflectance changes with the angle of illumination or viewing and to consider wavelengths beyond the visible. Efforts to characterize these optical properties, however, have been h ered by heterogeneity in measurement techniques, parameters and terminology. Here, we propose a standardized set of measurements, parameters and terminology to describe the optical properties of natural objects based on spectrometry, including angle-dependent effects, such as iridescence and specularity. We select a set of existing measurements and parameters that are generalizable to any wavelength range and spectral shape, and we highlight which subsets of measures are relevant to different biological questions. As a case study, we have applied these measures to 30 species of Christmas beetles, in which we observed previously unrealized ersity in visible and near-infrared reflectance. As expected, reflection of short wavelengths was associated with high spectral purity and angle dependence. In contrast to simple, artificial structures, iridescence and specularity were not strongly correlated, highlighting the complexity and modularity of natural materials. Species did not cluster according to spectral parameters or genus, suggesting high lability of optical properties. The proposed standardization of measures and parameters will improve our understanding of biological adaptations for manipulating light by facilitating the systematic comparison of complex optical properties, such as glossy or metallic appearances and visible or near-infrared iridescence.
Refractive index profile of a multi-step fibre using differential interference contrast microscopy
Publisher: IEEE
Date: 06-2007
The Dark Side of Plasmonics
Publisher: American Chemical Society (ACS)
Date: 08-07-2013
DOI: 10.1021/NL401656E
Abstract: Plasmonic dark modes are pure near-field modes that can arise from the plasmon hybridization in a set of interacting nanoparticles. When compared to bright modes, dark modes have longer lifetimes due to their lack of a net dipole moment, making them attractive for a number of applications. We demonstrate the excitation and optical detection of a collective dark plasmonic mode from in idual plasmonic trimers. The trimers consist of triangular arrangements of gold nanorods, and due to this symmetry, the lowest-energy dark plasmonic mode can interact with radially polarized light. The experimental data presented confirm the excitation of this mode, and its assignment is supported with an electrostatic approximation wherein these dark modes are described in terms of plasmon hybridization. The strong confinement of energy in these modes and their associated near fields hold great promise for achieving strong coupling to single photon emitters.
<title>Investigation of optical fields using near-field optical techniques</title>
Publisher: SPIE
Date: 06-09-1995
DOI: 10.1117/12.218699
Three-dimensional phase imaging with a scanning optical-fiber interferometer
Publisher: The Optical Society
Date: 06-1999
DOI: 10.1364/AO.38.003508
Abstract: We describe a quantitative method for measuring the phase of a propagating wave field in three dimensions by use of a scanning optical-fiber interferometer. Because phase modulation in the reference arm is exploited, this technique is insensitive to large variations in the intensity of the field being studied and is therefore highly suitable for measurement of phase within spatially confined optical beams. It uses only a single detector and is not reliant on lock-in electronics. The technique is applied to the measurement of the near field of a cleaved optical fiber and is shown to produce results in good agreement with theory.
Plasmonic Edge States: An Electrostatic Eigenmode Description
Publisher: American Chemical Society (ACS)
Date: 16-06-2017
Noninterferometric characterization of partially coherent scalar wave fields and application to scattered light
Publisher: Optica Publishing Group
Date: 18-09-2007
A localized surface plasmon resonance-based optical fiber sensor with sub-wavelength apertures
Publisher: AIP Publishing
Date: 04-11-2013
DOI: 10.1063/1.4829530
Near-Perfect Absorption of Light by Coherent Plasmon–Exciton States
Publisher: American Chemical Society (ACS)
Date: 03-05-2021
Fluorimetric analysis of the constituent dyes within daylight fluorescent pigments: Implications for display and preservation of daylight fluorescent artwork
Publisher: Informa UK Limited
Date: 05-2013
Atom-scale ptychographic electron diffractive imaging of boron nitride cones
Publisher: American Physical Society (APS)
Date: 14-02-2012
Direct Assembly of Vertically Oriented, Gold Nanorod Arrays
Publisher: Wiley
Date: 29-10-2020
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