ORCID Profile
0000-0002-3943-5947
Current Organisation
University of Melbourne
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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.
Nanotechnology | Photonics, Optoelectronics and Optical Communications | Nanophotonics | Nanoscale Characterisation | Classical and Physical Optics | Nanobiotechnology | Nanochemistry and Supramolecular Chemistry
Expanding Knowledge in the Chemical Sciences | Scientific Instruments | Human Diagnostics | Communication Networks and Services not elsewhere classified | Expanding Knowledge in Technology |
Publisher: Optica Publishing Group
Date: 16-05-2005
Abstract: We present a deterministic method to generate modified helical beams which create optical vortices with desired dark core intensity patterns in the far-field. The experiments are implemented and verified by a spatial light modulator (SLM), which imprints a phase function onto the incident wavefront of a TEM00 laser mode to transform the incident beam into a modified helical beam. The phase function can be calculated once a specific dark core shape of an optical vortex is required. The modified helical beam is exploited in optical manipulation with verification of its orbital angular momentum experimentally.
Publisher: Springer Science and Business Media LLC
Date: 13-03-2015
DOI: 10.1038/LSA.2015.30
Publisher: Optica Publishing Group
Date: 06-07-2007
DOI: 10.1364/AO.46.004680
Abstract: As a proof of concept, we experimentally demonstrate multiplexing of free-space optical signals in multiple channels labeled with different states of orbital angular momentum. The multiplexing process is carried out by a dynamic liquid-crystal spatial light modulator, while the phase function is calculated by an iterative algorithm. A binary litude computer-generated hologram serves as a demultiplexer.
Publisher: American Chemical Society (ACS)
Date: 17-05-2017
Publisher: Optica Publishing Group
Date: 02-10-2007
DOI: 10.1364/OL.32.002927
Abstract: We demonstrate that it is possible to generate high-order optical vortices from a single phase wedge by applying an incident beam with an annular intensity distribution. Various topological charges of optical vortices are realized by a static phase wedge when the position and radius of the annular illumination are changed accordingly.
Publisher: Optica Publishing Group
Date: 05-2006
Abstract: Phase-only elements are generally more desirable than complex- litude-modulated elements not only because of the higher diffraction efficiency but the readier implementation and fabrication. A novel iterative algorithm is proposed for generating multiple helical modes by a single phase-only element. A superposition of four helical modes is demonstrated experimentally by using a spatial light modulator.
Publisher: IOP Publishing
Date: 05-09-2012
DOI: 10.1088/0957-4484/23/38/385204
Abstract: A novel phase modulation method for dynamic manipulation of surface plasmon polaritons (SPPs) with a phase engineered optical vortex (OV) beam illuminating on nanoslits is experimentally demonstrated. Because of the unique helical phase carried by an OV beam, dynamic control of SPP multiple focusing and standing wave generation is realized by changing the OV beam's topological charge constituent with the help of a liquid-crystal spatial light modulator. Measurement of SPP distributions with near-field scanning optical microscopy showed an excellent agreement with numerical predictions. The proposed phase modulation technique for manipulating SPPs features has seemingly dynamic and reconfigurable advantages, with profound potential for development of SPP coupling, routing, multiplexing and high-resolution imaging devices on plasmonic chips.
Publisher: AIP Publishing
Date: 03-11-2008
DOI: 10.1063/1.3005636
Abstract: A method for generating and controlling dynamic surface plasmon patterns by highly focused “cogwheel-shaped” beams is studied theoretically and experimentally. The “cogwheel” beams are formed by collinear superposition of two Laguerre–Gaussian beams with equal but opposite topological charges. It is shown that the patterned surface plasmons can be reconfigured locally with advantages over patterned metallic islands.
Publisher: SPIE
Date: 22-12-2015
DOI: 10.1117/12.2202567
Publisher: Optica Publishing Group
Date: 23-07-2007
DOI: 10.1364/OL.32.002170
Abstract: A generalized model of a double-wedge phase element containing two side-by-side parallel phase r s with arbitrary slope angles is proposed. We study the diffracted optical field of a double-wedge element in terms of orbital angular momentum states. Analytical calculations reveal how the radius and position of the illuminating laser beam affect the composition of orbital angular momentum generated by the phase wedges.
Publisher: Proceedings of the National Academy of Sciences
Date: 15-12-2014
Abstract: As powerful semiconductor laser sources open up new possibilities for the realization of compact and versatile spectroscopy and detection systems, monolithic control of the laser output characteristics becomes essential. Whereas engineering of spectral characteristics and beam shape has reached a high level of maturity, manipulation of the polarization state remains challenging. We present a method for monolithic control of the degree of circular polarization by aperture antennas forming a surface-emitting grating on a semiconductor laser cavity and demonstrate its realization for a terahertz quantum cascade laser. Our approach is not limited to the terahertz regime and paves the way to an increased functionality and customizability of monolithic laser sources for a variety of applications (e.g., vibrational circular dichroism spectroscopy).
Publisher: American Chemical Society (ACS)
Date: 27-10-2020
Publisher: American Chemical Society (ACS)
Date: 21-09-2017
Abstract: Lateral transition-metal dichalcogenide and their heterostructures have attracted substantial attention, but there lacks a simple approach to produce large-scaled optoelectronic devices with graded composition. In particular, the incorporation of substitution and doping into heterostructure formation is rarely reported. Here, we demonstrate growth of a composition graded doped lateral WSe
Publisher: Optica Publishing Group
Date: 15-12-2005
DOI: 10.1364/OL.30.003266
Abstract: We propose a highly efficient approach to generating multihelix beams that contain more than one helical mode, and the power distribution over helical modes is adjustable. A multihelix beam embedded with three collinear helical modes is demonstrated by use of a spatial light modulator.
Publisher: Optica Publishing Group
Date: 06-2006
DOI: 10.1364/OL.31.001600
Abstract: We propose a design for a phase mask for generating an optical vortex with suppressed sidelobes in the focal plane where the radius of the intensity ring is variable. A radial modulation added to conventional phase mask exp(iltheta) projects the light diffracted from different annular zones into a single intensity ring in the focal plane.
Publisher: Springer Science and Business Media LLC
Date: 26-02-2016
DOI: 10.1038/LSA.2016.34
Abstract: The Fourier transform (FT), a cornerstone of optical processing, enables rapid evaluation of fundamental mathematical operations, such as derivatives and integrals. Conventionally, a converging lens performs an optical FT in free space when light passes through it. The speed of the transformation is limited by the thickness and the focal length of the lens. By using the wave nature of surface plasmon polaritons (SPPs), here we demonstrate that the FT can be implemented in a planar configuration with a minimal propagation distance of around 10 μm, resulting in an increase of speed by four to five orders of magnitude. The photonic FT was tested by synthesizing intricate SPP waves with their Fourier components. The reduced dimensionality in the minuscule device allows the future development of an ultrafast on-chip photonic information processing platform for large-scale optical computing.
Publisher: Wiley
Date: 22-09-2023
Abstract: Metasurfaces consisting of planar subwavelength structures with minimal thickness are appealing to emerging technologies such as integrated optics and photonic chips for their small footprint and compatibility with sophisticated planar nanofabrication techniques. However, reduced dimensionality due to the two‐dimensional nature of a metasurface poses challenges to the adaptation of a few useful methods that have found great success with conventional optics in three‐dimensional space. For instance, Bragg diffraction is the foundation of the well‐established technique of phase‐coded multiplexing in volume holography. It relies on interference among the scattered waves from multiple layers across the thickness of a s le. In this work, despite losing the dimension in thickness, a metasurface is devised to experimentally demonstrate phase‐coded multiplexing by replacing free‐space light with a surface wave in its output. The in‐plane interference along the propagation of the surface wave resembles the Bragg diffraction, thus enabling phase‐coded multiplexing in the two‐dimensional design. An ex le of code‐based all optical routing is also achieved by using a multiplexed metasurface, which could find applications in photonic data processing and communications. This article is protected by copyright. All rights reserved
Publisher: Wiley
Date: 15-04-2019
Abstract: Simultaneous broadband and high efficiency merits of designer metasurfaces are currently attracting widespread attention in the field of nanophotonics. However, contemporary metasurfaces rarely achieve both advantages simultaneously. For the category of transmissive metadevices, plasmonic or conventional dielectric metasurfaces are viable for either broadband operation with relatively low efficiency or high efficiency at only a selection of wavelengths. To overcome this limitation, dielectric nanoarcs are proposed as a means to accomplish two advantages. Continuous nanoarcs support different electromagnetic resonant modes at localized areas for generating phase retardation. Meanwhile, the geometric nature of nanoarc curvature endows the nanoarcs with full phase coverage of 0-2π due to the Pancharatnam-Berry phase principle. Experimentally incorporated with the chiral-detour phase principle, a few compelling functionalities are demonstrated, such as chiral beamsplitting, broadband holography, and helicity-selective holography. The continuous nanoarc metasurfaces prevail over plasmonic or dielectric discretized building block strategies and the findings lead to novel designs of spin-controllable metadevices.
Publisher: The Optical Society
Date: 04-01-2012
DOI: 10.1364/OE.20.001060
Publisher: The Optical Society
Date: 12-11-2014
Publisher: AIP Publishing
Date: 02-01-2012
DOI: 10.1063/1.3673334
Abstract: A flat optical device that generates optical vortices with a variety of topological charges is demonstrated. This device spatially modulates light beams over a distance much smaller than the wavelength in the direction of propagation by means of an array of V-shaped plasmonic antennas with sub-wavelength separation. Optical vortices are shown to develop after a sub-wavelength propagation distance from the array, a feature that has major potential implications for integrated optics.
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.
Publisher: AIP Publishing
Date: 17-03-2008
DOI: 10.1063/1.2890058
Abstract: We demonstrate that surface plasmon polaritons can be generated by optical vortex beams at normal incidence focused on a metal surface. The surface plasmon resonant angle can be modulated by the radius of the optical vortex beam in the case of different metal/dielectric interface configurations. Our experiments show that the fluorescence in the vicinity of the metal film surface can effectively be excited and detected within the inner ring of the optical vortex beams due to the localized surface plasmon polaritons.
Publisher: Springer Science and Business Media LLC
Date: 21-05-2015
DOI: 10.1038/SREP10529
Abstract: Metasurfaces are promising two-dimensional metamaterials that are engineered to provide unique properties or functionalities absent in naturally occurring homogeneous surfaces. Here, we report a type of metasurface for tailored reconstruction of surface plasmon waves from light. The design is based on an array of slit antennas arranged in a way that it matches the complex field distribution of the desired surface plasmon wave. The approach is generic so that one can readily create more intricate designs that selectively generate different surface plasmon waves through simple variation of the wavelength or the polarization state of incident light. The ultra-thin metasurface demonstrated in this paper provides a versatile interface between the conventional free-space optics and a two-dimensional platform such as surface plasmonics.
Publisher: American Chemical Society (ACS)
Date: 06-09-2017
Publisher: The Optical Society
Date: 18-12-2014
DOI: 10.1364/OE.22.032016
Publisher: AIP Publishing
Date: 15-08-2006
DOI: 10.1063/1.2260823
Abstract: Particles optically trapped and rotated in fluidic medium by a vortex beam receive a torque exerted by orbital angular momentum of the beam. Size and shape of the trapped particles are found to affect the rotation remarkably e.g., a lump of particles is easier to be set in rotation than a single particle, and a row of particles stuck to each other will rotate faster than isolated particles. Influences of the size and arranging manner of a group of particles on the rotation are investigated analytically and experimentally.
Publisher: Optica Publishing Group
Date: 03-10-2005
Abstract: We experimentally demonstrate optical rotation and manipulation of microscopic particles by use of optical vortex beams with fractional topological charges, namely fractional optical vortex beams, which are coupled in an optical tweezers system. Like the vortex beams with integer topological charges, the fractional optical vortex beams are also capable of rotating particles induced by the transfer of orbital angular momentum. However, the unique radial opening (low-intensity gap) in the intensity ring encompassing the dark core, due to the fractional nature of the beam, hinders the rotation significantly. The fractional vortex beam's orbital angular momentum and radial opening are exploited to guide and transport microscopic particles.
Publisher: American Chemical Society (ACS)
Date: 09-08-2013
DOI: 10.1021/NL402039Y
Abstract: We report a new type of holographic interface, which is able to manipulate the three fundamental properties of light (phase, litude, and polarization) over a broad wavelength range. The design strategy relies on replacing the large openings of conventional holograms by arrays of subwavelength apertures, oriented to locally select a particular state of polarization. The resulting optical element can therefore be viewed as the superposition of two independent structures with very different length scales, that is, a hologram with each of its apertures filled with nanoscale openings to only transmit a desired state of polarization. As an implementation, we fabricated a nanostructured holographic plate that can generate radially polarized optical beams from circularly polarized incident light, and we demonstrated that it can operate over a broad range of wavelengths. The ability of a single holographic interface to simultaneously shape the litude, phase, and polarization of light can find widespread applications in photonics.
Publisher: Springer Science and Business Media LLC
Date: 29-11-2006
Publisher: Optica Publishing Group
Date: 24-10-2008
DOI: 10.1364/OE.16.018451
Abstract: Following our recent experimental approach to excitation of surface plasmon polaritons induced by optical vortex beams [5], we report further analysis and verification of the surface plasmon interference pattern formed by locally excited standing surface plasmon polaritons in a metal/dielectric film. Our simulation model can be demonstrated by using angular spectrum representation. The generated standing interference pattern has potential as a resolution enhancement technique for sub-diffraction imaging.
Publisher: AIP Publishing
Date: 29-12-2008
DOI: 10.1063/1.3040697
Abstract: A composite microlens array (MLA) with two cascaded guiding axes has been fabricated to achieve a large lateral separation of an object with different refractive indices or sizes. The MLA projects a composite pattern formed by its focal spots into a microchamber for optical sorting in a microscopic system. This approach enables passive, high power, efficient, and continuous microfluidic sorting without requiring complicated optical assembly. Separation of particles with different refractive indices to a lateral angle of 40° is experimentally demonstrated with moderate laser power.
Publisher: AIP Publishing
Date: 30-07-2007
DOI: 10.1063/1.2760183
Abstract: The authors propose a low-pass 2f spatial filter for improving optical vortex beams in terms of circular geometry generated by a microfabricated wedge in free space. Compared with a conventional wedge, they are able to realize high-quality vortex beams with Q value close to 1 in free-space propagation. Physical mechanism behind the technique is found that it removes the diffraction artifacts as well as higher spatial frequency components of the quasivortex beams based on a wedge and hence the filtered beam is reconstructed with minimized distortions.
Publisher: Hindawi Limited
Date: 2015
DOI: 10.1155/2015/474730
Abstract: By combining different plasmonic nanostructures with conventional sensing configurations, chemical/biosensors with significantly enhanced device performance can be achieved. The fast development of plasmon-assisted devices benefits from the advance of nanofabrication technology. In this review, we first briefly show the experimental configurations for testing plasmon enhanced sensing signals and then summarize the classic nanogeometries which are extensively used in sensing applications. By design, dramatic increment of optical signals can be obtained and further applied to gas, refractive index and liquid sensing.
Publisher: Optica Publishing Group
Date: 20-02-2006
DOI: 10.1364/AO.45.001153
Abstract: We propose using a solitary kinoform-type spiral phase plate structure to generate an array of vortices located in a single beam. Kinoform-type spiral surfaces allow each wavelength component of the phase modulation value to be wrapped back to its 2 pi equivalent for optical vortices of high charge. This allows the surface-relief profiles of high-charge vortices to be microfabricated with the same physical height as spiral phase plates of unity-charged optical vortices. The m-charged optical vortex obtained interacts with the inherent coherent background, which changes the propagation dynamics of the optical vortex and splits the initial m charge into /m/ unity-charged optical vortices within the same beam. Compared to a hologram, a multistart spiral phase plate is more efficient in the use of available spatial frequencies and beam energy and also is computationally less demanding. Furthermore, using microfabrication techniques will allow for greater achievable tolerances in terms of smaller feature sizes.
Publisher: Optica Publishing Group
Date: 23-01-2006
Abstract: When two vortex beams with unequal topological charges superpose coherently, orbital angular momentum (OAM) in the two beams would not be cancelled out completely in the interference. The residual OAMs contained by the superposed beam are located at different concentric rings and may have opposite orientations owing to the difference of the charges. The residual OAM can be confirmed by the rotation of microparticles when difference between the charges of two interfering beams is large.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 06-2018
Abstract: Researchers report a reconfigurable and wavelength-independent platform for generating a tailored plasmonic field distribution.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CP00185D
Abstract: Silver nanorod array enabled homeotropic alignment of photoresponsive liquid crystals and polarization-insensitive optical tuning.
Publisher: AIP Publishing
Date: 17-07-2006
DOI: 10.1063/1.2226995
Abstract: We propose a method for producing a sequence of focused optical vortices along the propagation direction by using a spiral fractal zone plate. The generated beam possesses the optical vortices embedded at subsidiary foci as well as the major ones of the fractal zone plate. The experimental results are obtained in good agreement with the simulations.
Publisher: Wiley
Date: 06-04-2017
Publisher: The Optical Society
Date: 04-2013
DOI: 10.1364/OL.38.001182
Publisher: American Physical Society (APS)
Date: 31-08-2012
Publisher: Springer Science and Business Media LLC
Date: 07-05-2014
Publisher: The Optical Society
Date: 06-04-2011
DOI: 10.1364/OL.36.001341
Publisher: Frontiers Media SA
Date: 19-11-2014
Publisher: AIP Publishing
Date: 26-11-2012
DOI: 10.1063/1.4767646
Abstract: We show that perfect absorption can be achieved in a system comprising a single lossy dielectric layer of thickness much smaller than the incident wavelength on an opaque substrate by utilizing the nontrivial phase shifts at interfaces between lossy media. This design is implemented with an ultra-thin (∼λ/65) vanadium dioxide (VO2) layer on sapphire, temperature tuned in the vicinity of the VO2 insulator-to-metal phase transition, leading to 99.75% absorption at λ = 11.6 μm. The structural simplicity and large tuning range (from ∼80% to 0.25% in reflectivity) are promising for thermal emitters, modulators, and bolometers.
Publisher: Optica Publishing Group
Date: 23-04-2010
DOI: 10.1364/AO.49.002456
Publisher: AIP Publishing
Date: 22-10-2007
DOI: 10.1063/1.2802576
Abstract: The authors present experimental results of self-referenced spiral interference realized by a hollow spiral phase plate fabricated by electron beam lithography. Comparing with conventional interference systems, the proposed phase element provides a simple and robust approach to obtaining spiral interference fringes in a self-referenced interferometric way. Experimental implementation confirms that the element can be employed as an external tool kit for simple modification of existing optical microscopes to interferometers.
Publisher: The Optical Society
Date: 29-07-2013
DOI: 10.1364/OL.38.002783
Publisher: Springer Science and Business Media LLC
Date: 17-06-2016
DOI: 10.1038/SREP28062
Abstract: Colour filters based on nano-apertures in thin metallic films have been widely studied due to their extraordinary optical transmission and small size. These properties make them prime candidates for use in high-resolution colour displays and high accuracy bio-sensors. The inclusion of polarization sensitive plasmonic features in such devices allow additional control over the electromagnetic field distribution, critical for investigations of polarization induced phenomena. Here we demonstrate that cross-shaped nano-apertures can be used for polarization controlled color tuning in the visible range and apply fundamental theoretical models to interpret key features of the transmitted spectrum. Full color transmission was achieved by fine-tuning the periodicity of the apertures, whilst keeping the geometry of in idual apertures constant. We demonstrate this effect for both transverse electric and magnetic fields. Furthermore we have been able to demonstrate the same polarization sensitivity even for nano-size, sub-wavelength sets of arrays, which is paramount for ultra-high resolution compact colour displays.
Publisher: The Optical Society
Date: 16-05-2013
Publisher: Springer Science and Business Media LLC
Date: 11-12-2012
DOI: 10.1038/NCOMMS2293
Abstract: Metallic components such as plasmonic gratings and plasmonic lenses are routinely used to convert free-space beams into propagating surface plasmon polaritons and vice versa. This generation of couplers handles relatively simple light beams, such as plane waves or Gaussian beams. Here we present a powerful generalization of this strategy to more complex wave-fronts, such as vortex beams that carry orbital angular momentum, also known as topological charge. This approach is based on the principle of holography: the coupler is designed as the interference pattern of the incident vortex beam and focused surface plasmon polaritons. We have integrated these holographic plasmonic interfaces into commercial silicon photodiodes, and demonstrated that such devices can selectively detect the orbital angular momentum of light. This holographic approach is very general and can be used to selectively couple free-space beams into any type of surface wave, such as focused surface plasmon polaritons and plasmonic Airy beams.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 19-04-2013
Abstract: Surface plasmons are light-induced collective electronic excitations in a metal that offer the possibility of manufacturing optoelectronic devices at nanometer scale. Before such shrinking can be achieved, the propagation direction and lifetime of the plasmonic excitations have to be controlled (see the Perspective by Miroshnichenko and Kivshar ). Rodríguez-Fortuño et al. (p. 328 ) show how this is done using polarized light. Alternatively, using an array of metallic nanoantennae (in this case, slits) patterned into a thin gold film, Lin et al. (p. 331 ) present a further improvement on current plasmonic coupling schemes that has the potential to encode information contained in both the intensity and polarization of light.
Publisher: American Chemical Society (ACS)
Date: 23-07-2019
Publisher: Optica Publishing Group
Date: 20-08-2008
DOI: 10.1364/OE.16.013599
Abstract: A multi-element design scheme is proposed to produce optical vortices of large spectrum width. The key component within the approach is a radially modulated spiral phase plate. Apart from a conventional spiral phase plate having an azimuthal phase function, the proposed element possesses an additional change of phase in the radial direction.
Publisher: The Optical Society
Date: 05-12-2013
DOI: 10.1364/OL.38.005296
Publisher: Optica Publishing Group
Date: 06-07-2009
DOI: 10.1364/OE.17.011315
Abstract: Polymer refractive microstructures are fabricated on metallic thin films and employed to modulate surface plasmons (SPs) propagations in a refractive manner. SP waves converging with different focal lengths and erging effects are realized by the refractive structures. Authors investigated the modulation effect on SP waves as a function of different thicknesses and different shapes of the polymer micro-structures based on the effective refractive index model, where imaging properties of the SPs are observed experimentally by detecting the leaky radiation intensity of the SPs.
Location: Singapore
Start Date: 04-2013
End Date: 04-2016
Amount: $374,852.00
Funder: Australian Research Council
View Funded ActivityStart Date: 08-2015
End Date: 04-2017
Amount: $700,000.00
Funder: Australian Research Council
View Funded Activity