ORCID Profile
0000-0003-2322-9775
Current Organisation
University of South Australia
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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)
Nuclear physics | Communications Technologies | Nuclear and plasma physics | Law and society and socio-legal research | Mineral processing/beneficiation | Coding and Information Theory | Optical Fibre Communications |
ANZSRC Socio-Economic Objective (SEO)
Fixed Line Data Networks and Services | Network Infrastructure Equipment | Expanding Knowledge in Engineering |
Related Links
Publications
Development of an optical fiber‐based redox monitoring system for tissue metabolism
Publisher: Wiley
Date: 25-01-2022
Abstract: An optical redox ratio can potentially be used to report on the dynamics of cell and tissue metabolism and define altered metabolic conditions for different pathologies. While there are methods to measure the optical redox ratio, they are not particularly suited to real‐time in situ or in vivo analysis. Here, we have developed a fiber‐optic system to measure redox ratios in cells and tissues and two mathematical models to enable real‐time, in vivo redox measurements. The optical redox ratios in tissue explants are correlated directly with endogenous NADH/FAD fluorescence emissions. We apply the mathematical models to the two‐photon microscopy data and show consistent results. We also used our fiber‐optic system to measure redox in different tissues and show consistent results between the two models, hence demonstrating proof‐of‐principle. This innovative redox monitoring system will have practical applications for defining different metabolic disease states.
Efficient excitation of surface plasmons in metal nanorods using large longitudinal component of high index nano fibers
Publisher: The Optical Society
Date: 28-06-2011
DOI: 10.1364/OE.19.013464
Effect of the finite extinction ratio of an electro-optic modulator on the performance of distributed probe-pump Brillouin sensorsystems
Publisher: Optica Publishing Group
Date: 15-08-2003
DOI: 10.1364/OL.28.001418
Abstract: The effect of the finite extinction ratio of an electro-optic modulator (EOM) on the Brillouin frequency measurement of a distributed Brillouin-based fiber optic sensor is studied. An EOM with a finite extinction ratio limits the application of Brillouin optical time domain analysis in a distributed Brillouin-based fiber optic sensor. This results in confusion in specifying the location of the strained region and in error in detecting the Brillouin frequency and hence in strain and temperature measurement.
Bragg waveguides with low-index liquid cores
Publisher: The Optical Society
Date: 19-12-2012
DOI: 10.1364/OE.20.000048
Suspended Core Fibers for the Transmission of Cylindrical Vector Modes
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-12-2016
Strong Magnetic Response of Optical Nanofibers
Publisher: American Chemical Society (ACS)
Date: 23-05-2016
Nonlinear self-polarization flipping in silicon sub-wavelength waveguides: distortion, loss, dispersion, and noise effects
Publisher: The Optical Society
Date: 31-10-2014
DOI: 10.1364/OE.22.027643
Design concepts for the Cherenkov Telescope Array CTA: an advanced facility for ground-based high-energy gamma-ray astronomy
Publisher: Springer Science and Business Media LLC
Date: 23-11-2011
Lead-germanate glasses and fibers: a practical alternative to tellurite for nonlinear fiber applications
Publisher: The Optical Society
Date: 27-08-2013
DOI: 10.1364/OME.3.001488
Light confinement within nanoholes in nanostructured optical fibers
Publisher: The Optical Society
Date: 30-11-2010
DOI: 10.1364/OE.18.026018
Emerging nonlinear optical fibers: Fabrication and access to new properties
Publisher: IEEE
Date: 2009
Towards new fiber optic sensors based on the vapor deposited conducting polymer PEDOT: Tos
Publisher: The Optical Society
Date: 04-11-2019
DOI: 10.1364/OME.9.004517
Simulation of the distributed fiber optic pump-probe Brillouin sensor
Publisher: SPIE
Date: 16-11-2004
DOI: 10.1117/12.567410
A full vectorial model for pulse propagation in emerging waveguides with subwavelength structures part ii: Stimulated Raman Scattering
Publisher: Optica Publishing Group
Date: 06-07-2009
DOI: 10.1364/OE.17.011565
Abstract: The significance of full vectorial pulse propagation through emerging waveguides has not been investigated. Here we report the development of a generalised vectorial model of nonlinear pulse propagation due to the effects of Stimulated Raman Scattering (SRS) in optical waveguides. Unlike standard models, this model does not use the weak guidance approximation, and thus accurately models the modal Raman gain of optical waveguides in the strong guidance regime. Here we develop a vectorial-based nonlinear Schrödinger Eq. (VNSE) to demonstrate how the standard model fails in certain regimes, with up to factors of 2.5 enhancement in Raman gain between the VNSE and the standard model. Using the VNSE we are able to explore opportunities for tailoring of the modal Raman gain spectrum to achieve effects such as gain flattening through design of the optical fiber.
Subwavelength fiber: Enhanced THz Magnetic Source
Publisher: IEEE
Date: 09-2018
Impact of EOM extinction ratio on the Brillouin frequency measurement of distributed fiber optic sensors
Publisher: SPIE
Date: 12-12-2003
DOI: 10.1117/12.543842
Investigation of a fibre-coupled beryllium oxide (BeO) ceramic luminescence dosimetry system
Publisher: Elsevier BV
Date: 11-2014
A novel approach to Bragg fibre bandgap analysis: Stratified planar anti-resonant reflecting optical waveguides
Publisher: IEEE
Date: 07-2008
High stability supercontinuum generation in lead silicate SF57 photonic crystal fibers
Publisher: IOP Publishing
Date: 2013
Nonlinear material diagnostics using filled nanostructured fibres
Publisher: IEEE
Date: 07-2006
Low loss, low dispersion T-ray transmission in Microwires
Publisher: IEEE
Date: 05-2007
Fluorescence-based sensing with optical nanowires: A generalized model and experimental validation
Publisher: Optica Publishing Group
Date: 21-04-2010
DOI: 10.1364/OE.18.009474
Record nonlinearity in optical fibre
Publisher: Institution of Engineering and Technology (IET)
Date: 2008
DOI: 10.1049/EL:20083094
Black hole lightning due to particle acceleration at subhorizon scales
Publisher: American Association for the Advancement of Science (AAAS)
Date: 28-11-2014
Abstract: Supermassive black holes with masses of millions to billions of solar masses are commonly found in the centers of galaxies. Astronomers seek to image jet formation using radio interferometry but still suffer from insufficient angular resolution. An alternative method to resolve small structures is to measure the time variability of their emission. Here we report on gamma-ray observations of the radio galaxy IC 310 obtained with the MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov) telescopes, revealing variability with doubling time scales faster than 4.8 min. Causality constrains the size of the emission region to be smaller than 20% of the gravitational radius of its central black hole. We suggest that the emission is associated with pulsar-like particle acceleration by the electric field across a magnetospheric gap at the base of the radio jet.
Direct probing of evanescent field for characterization of porous terahertz fibers
Publisher: AIP Publishing
Date: 21-03-2011
DOI: 10.1063/1.3568892
Abstract: We develop a technique based on a micromachined photoconductive probe-tip to characterize a terahertz (THz) porous fiber. Losses less than 0.08 cm−1 are measured in the frequency range from 0.2 to 0.35 THz, with the minimum of 0.003 cm−1 at 0.24 THz. Normalized group velocity greater than 0.8, which corresponds to dispersion values in between −1.3 and −0.5 ps/m/μm for 0.2& f& .35 THz are obtained. Moreover, we directly measure the evanescent electric field as a function of frequency. Good agreement between the measured curves and expected theoretical values indicates the low invasiveness of the applied probe-tip.
Recent progress in theory of nonlinear pulse propagation in subwavelength waveguides
Publisher: IEEE
Date: 08-2012
Fabrication and supercontinuum generation in dispersion flattened bismuth microstructured optical fiber
Publisher: The Optical Society
Date: 10-10-2011
DOI: 10.1364/OE.19.021135
Steady-state and travelling wave solutions with nonlinear polarization attraction
Publisher: The Optical Society
Date: 29-04-2016
Nonlinear Self-Flipping of Polarization States in Asymmetric Waveguides
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2012
Dipole emitters in fiber: Interface effects, collection efficiency and optimization
Publisher: The Optical Society
Date: 09-08-2011
DOI: 10.1364/OE.19.016182
Cross mode and polarization mixing in third and one-third harmonic generation in multi-mode waveguides
Publisher: The Optical Society
Date: 04-02-2015
Bandgaps and antiresonances in integrated-ARROWs and Bragg fibers; a simple model
Publisher: Optica Publishing Group
Date: 21-10-2008
DOI: 10.1364/OE.16.017935
Abstract: We consider the spectral properties of dielectric waveguides with low refractive index cores and binary layered claddings, such as Bragg fibers and integrated-ARROWs. We show that the full, nontrivial, 2-D spectrum of Bloch bands (hence bandgaps) of such claddings correspond, in structure and topology, to the dispersion properties of both constituent layer types quantitatively demonstrating an intimate relationship between the bandgap and antiresonance guidance mechanisms. The dispersion functions of these layers, and the interactions thereof, thus form what we coin the Stratified Planar Anti-Resonant Reflecting OpticalWaveguide (SPARROW) model, capable of quantitative, analytic, descriptions of many nontrivial bandgap and antiresonance properties. The SPARROW model is useful for the spectral analysis and design of Bragg fibers and integrated-ARROWs with cores of arbitrary refractive index (equal to or less than the lowest cladding index). Both waveguide types are of interest for sensing and microfluidic applications due to their natural ability to guide light within low-index cores, permitting low-loss guidance within a large range of gases and liquids. A liquid-core Bragg fiber is discussed as an ex le, demonstrating the applicability of the SPARROW model to realistic and important waveguide designs.
Evaluation of a real-time optically stimulated luminescence beryllium oxide (BeO) fibre-coupled dosimetry system with a superficial 140 kVp X-ray beam.
Publisher: Elsevier BV
Date: 09-2019
DOI: 10.1016/J.EJMP.2019.08.021
Abstract: The purpose of this study was to investigate the potential of real-time optically stimulated luminescence (rtOSL) measurements of a beryllium oxide (BeO) ceramic fibre-coupled luminescence dosimetry system. By pulsing the stimulation laser during the exposure to ionizing radiation, an rtOSL dose-rate measurement can be obtained which could be stem effect free. A portable rtOSL BeO ceramic fibre-coupled dosimetry system is presented and characterized using a constant dose-rate superficial 140 kVp X-ray beam. The rtOSL was measured for dose-rates between 0.29 and 3.88 Gy/min, controlled by varying the source to surface distance. After correcting for OSL decay during the exposure, a linear dose-rate response of the change in rtOSL (ΔrtOSL) was observed. The ΔrtOSL was also observed to be stem effect free.
Nonlinear polarization bistability in optical nanowires
Publisher: The Optical Society
Date: 15-02-2011
DOI: 10.1364/OL.36.000588
Highly-efficient fluorescence sensing using microstructured optical fibres; side-access and thin-layer configurations
Publisher: SPIE
Date: 14-04-2008
DOI: 10.1117/12.785887
Small core optical waveguides are more nonlinear than expected: experimental confirmation
Publisher: Optica Publishing Group
Date: 12-11-2009
DOI: 10.1364/OL.34.003577
Radiated and guided optical waves of a magnetic dipole-nanofiber system
Publisher: Springer Science and Business Media LLC
Date: 05-03-2019
DOI: 10.1038/S41598-018-38115-Z
Abstract: Nanophotonics–photonic structures with subwavelength features–allow accessing high intensity and localized electromagnetic field and hence is an ideal platform for investigating and exploiting strong lightmatter interaction. In particular, such a strong light-matter interaction requires investigating the interaction of a magnetic dipole with the electromagnetic field– a less-explored topic, which has usually been ignored within the framework of electric dipole approximation. Motivated by recent advances in the emerging field of multipolar nanophotonics, here we develop an analytical model that provides a new insight into analyzing a magnetic dipole and a nanofiber. This method enables us to examine the effect of second term in the multipolar expansion of light-matter interaction, magnetic dipole approximation , with in idual guided and radiation modes of the nanofiber. This is a critical key in developing nanophotonic integrated devices based on magnetic nature of light for super-imaging, biosensing, and optical computing.
Subpeaks in the Brillouin loss spectra of distributed fiber-optic sensors
Publisher: Optica Publishing Group
Date: 15-05-2005
DOI: 10.1364/OL.30.001099
Abstract: Subpeaks in the Brillouin loss spectra of distributed fiber-optic sensors were observed for what is believed to be the first time and studied. We discovered that the Fourier spectrum of the pulsed signal and the off-resonance oscillation both contributed to subpeaks. The off-resonance oscillation at frequency /v - vB/ is the oscillation in the Brillouin time domain when beat frequency v of the two counterpropagating laser beams does not match local Brillouin frequency vB. This study is important in differentiating the subpeaks from actual strain-temperature peaks.
Design and verification of an external radiobiological beam port on a 16.5 MeV GE PETtrace proton cyclotron.
Publisher: Wiley
Date: 25-12-2019
DOI: 10.1002/MP.13935
Abstract: Protons and heavy ions are considered to be ideal particles for use in external beam radiotherapy due to the superior properties of the dose distribution. While a photon (x-ray) beam delivers considerable dose to healthy tissues around the tumor, a proton beam that is delivered with sufficient energies has: a low entrance dose (the dose in front of the tumor) a high-dose region within the tumor, known as the Bragg peak and, no exit dose beyond the tumor. Proton therapy is the next major step in advancing radiotherapy treatment. The purpose of this project was to adapt an existing radioisotope production cyclotron, a General Electric (GE) PETtrace, to enable radiobiological studies using proton beams. During routine use the PETtrace delivers 16.5 MeV protons to target with beam currents in the range of 10-100 µA resulting in dose rates in the order of kGy/s. To achieve the aim of the project the dose rate had to be reduced to the Gy/min range, without attenuating the proton energy below 5 MeV. This paper covers the design, construction and validation of the beam port. Monte Carlo simulations were performed, using GEANT4, SRIM and PACE4 to design the beam port and optimize its components. Once the beam port was fabricated, validation experiments were performed using EBT3 and HD-V2 Gafchromic™ films, and a Keithley 6485 pico ere meter. The external beam port was successfully modeled, designed and fabricated. By using a 0.25 mm thick gold foil and a brass pin-hole collimator the beam was spread from a narrow full beam diameter of 10 mm to a wide beam with a 5% flatness area in the center of the beam that had a diameter of ~20 mm. In using this system the dose rate was reduced from kGy/s to ~30 Gy/min.
Nonlinear polarization self-flipping and optical switching
Publisher: IEEE
Date: 08-2011
Efficient third and one-third harmonic generation in nonlinear waveguides
Publisher: The Optical Society
Date: 28-01-2013
DOI: 10.1364/OL.38.000329
High Index and Subwavelength Optical waveguides, New Fundamentals and Applications for Nonlinear Signal Processing
Publisher: IEEE
Date: 07-2014
DOI: 10.1109/SUM.2014.71
Dipole-fiber system: from single photon source to metadevices
Publisher: Springer Science and Business Media LLC
Date: 03-2018
Simple binary stack analysis via a phase space transformation
Publisher: IEEE
Date: 08-2011
Experimental investigation of dispersion properties of THz porous fibers
Publisher: IEEE
Date: 09-2009
Towards hybrid diamond optical devices
Publisher: IEEE
Date: 06-2011
CFD and experimental study of convectional heat transfer in free falling particle curtains
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4825928
Highly-efficient fluorescence sensing using microstructured optical fibres; general model and experiment
Publisher: SPIE
Date: 14-04-2008
DOI: 10.1117/12.785997
A TRANSIENT, THREE-DIMENSIONAL MODEL OF STIMULATED BRILLOUIN SCATTERING
Publisher: World Scientific Pub Co Pte Lt
Date: 03-2001
DOI: 10.1142/S0218863501000401
Abstract: An efficient numerical 3-D model of transient stimulated Brillouin scattering (SBS) is reported. The model is used to examine the effects of transient phenomena on the efficiency of phase conjugation by SBS and the mode structure of the Stokes and pump pulse inside the SBS cell. The effect of parameters such as phonon lifetime, input pulse shape and input energy on the transient fidelity of SBS is investigated. A new transient phenomenon which causes SBS fidelity degradation at high focal intensity (short Rayleigh range) is examined.
Optimization of whispering gallery resonator design for biosensing applications
Publisher: The Optical Society
Date: 19-06-2015
DOI: 10.1364/OE.23.017067
Combining whispering gallery mode lasers and microstructured optical fibers: limitations, applications and perspectives for in-vivo biosensing
Publisher: Springer Science and Business Media LLC
Date: 12-05-2016
DOI: 10.1557/ADV.2016.342
Optimal light collection from diffuse sources: Application to optical fibre-coupled luminescence dosimetry
Publisher: The Optical Society
Date: 20-02-2014
DOI: 10.1364/OE.22.004559
Porous fibers: Low loss, low dispersion waveguides for terahertz transmission
Publisher: IEEE
Date: 09-2008
Kerr nonlinearity in small core optical fibres and nanowires: A generalised model, and application to microstructured fibres
Publisher: IEEE
Date: 07-2008
A full vectorial model for pulse propagation in emerging waveguides with subwavelength structures part I: Kerr nonlinearity
Publisher: Optica Publishing Group
Date: 05-02-2009
DOI: 10.1364/OE.17.002298
Abstract: The propagation of pulses through waveguides with sub-wavelength features, inhomogeneous transverse structure, and high index contrast cannot be described accurately using existing models in the presence of nonlinear effects. Here we report the development of a generalised full vectorial model of nonlinear pulse propagation and demonstrate that, unlike the standard pulse propagation formulation, the z-component of guided modes plays a key role for these new structures, and results in generalised definitions of the nonlinear coefficient gamma, Aeff , and mode orthognality. While new definitions reduce to standard definitions in some limits, significant differences are predicted, including a factor of approximately 2 higher value for gamma, for emerging waveguides and microstructured fibers.
Correlated Eigenvalues of Multi-Soliton Optical Communications
Publisher: Springer Science and Business Media LLC
Date: 25-04-2019
DOI: 10.1038/S41598-019-42510-5
Abstract: There is a fundamental limit on the capacity of fibre optical communication system (Shannon Limit). This limit can be potentially overcome via using Nonlinear Frequency Division Multiplexing. Dealing with noises in these systems is one of the most critical parts in implementing a practical system. In this paper, we discover and characterize the correlations among the NFT channels. It is demonstrated that the correlation is universal (i.e., independent of types of system noises) and can be exploited to maximize transmission throughput. We propose and experimentally confirm a noise model showing that end-to-end noise can be modelled as the accumulation of noise associated with each segment of optical communication which can be dealt with independently. Also, each point noise can be further decomposed into different components, some of which are more significant (and even dominating) than others. Hence, one can further approximate and simplify the noise model by focusing on the significant component.
Optimal light collection in BeO fiber optic dosimetry
Publisher: IEEE
Date: 08-2011
A new fitting method for spectral characterization of Brillouin-based distributed sensors
Publisher: SPIE
Date: 12-12-2003
DOI: 10.1117/12.543836
Enhancing the radiation efficiency of dye doped microresonators using coupling effects with a suspended core microstructured optical fiber
Publisher: SPIE
Date: 22-02-2013
DOI: 10.1117/12.2004157
A method for refractive index measurement of a liquid in a suspended core fiber using Brillouin dynamic grating
Publisher: Informa UK Limited
Date: 03-2013
Energy dependency of a water-equivalent fibre-coupled beryllium oxide (BeO) dosimetry system
Publisher: Elsevier BV
Date: 02-2015
A genetic algorithm based approach to fiber design for high coherence and large bandwidth supercontinuum generation
Publisher: Optica Publishing Group
Date: 09-10-2009
DOI: 10.1364/OE.17.019311
High accuracy temperature and strain measurement with cm spatial resolution for distributed Brillouin-based fiber optic sensors
Publisher: SPIE
Date: 16-11-2004
DOI: 10.1117/12.567509
Low loss, low dispersion and highly birefringent terahertz porous fibers
Publisher: Elsevier BV
Date: 2009
A Fibre-Optic Platform for Sensing Nitrate Using Conducting Polymers
Publisher: MDPI AG
Date: 28-12-2020
DOI: 10.3390/S21010138
Abstract: Monitoring nitrate ions is essential in agriculture, food industry, health sector and aquatic ecosystem. We show that a conducting polymer, poly(3,4-ethylenedioxythiophene) (PEDOT), can be used for nitrate sensing through a process in which nitrate ion uptake leads to oxidation of PEDOT and change of its optical properties. In this study, a new platform is developed in which a single-mode fibre coated at the tip with PEDOT is used for nitrate sensing. A crucial step towards this goal is introduction of carbonate exposure to chemically reduced PEDOT to a baseline value. The proposed platform exhibits the change in optical behaviour of the PEDOT layer at the tip of the fibre as it undergoes chemical oxidation and reduction (redox). The change in optical properties due to redox switching varies with the intensity of light back reflected by the fibre coated with PEDOT. The proposed platform during oxidation demonstrates linear response for the uptake of nitrate ions in concentrations ranging between 0.2 and 40 parts per million (ppm), with a regression coefficient R2=0.97 and a detection limit of 6.7 ppm. The procedure for redox switching is repeatable as the back reflection light intensity reaches ±1.5% of the initial value after reduction.
Enhanced fluorescence sensing using microstructured optical fibers: A comparison of forward and backward collection modes
Publisher: Optica Publishing Group
Date: 24-06-2008
DOI: 10.1364/OL.33.001473
Abstract: A general model of excitation and fluorescence recapturing by the forward and backward modes of filled microstructured optical fibers (MOFs) is presented. We also present experimental results for both backward and forward fluorescence recapturing within a MOF as a function of fiber length and demonstrate a good qualitative agreement between the numerical model and experimental results. We demonstrate higher efficiency of fluorescence recapturing into backward modes in comparison with that of forward modes.
Cleaving of Extremely Porous Polymer Fibers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2009
Enhancement of stimulated Brillouin scattering of higher-order acoustic modes in single-mode optical fiber
Publisher: Optica Publishing Group
Date: 15-10-2005
DOI: 10.1364/OL.30.002685
Abstract: Solving the elastic wave equation exactly for a GeO2-doped silica fiber with a steplike distribution of the longitudinal and shear velocities and density, we have obtained the dispersion, attenuation, and fields of the leaky acoustic modes supported by the fiber. We have developed a model for stimulated Brillouin scattering of these modes in a pump-probe configuration and provided their Brillouin gains and frequencies for an extended range of core sizes and GeO2 doping. Parameter ranges close to cutoff of the acoustic modes and pump depletion enhance the ratio of higher-order peaks to the main peak in the Brillouin spectrum and are suitable for simultaneous strain-temperature sensing.
Unified theory of whispering gallery multilayer microspheres with single dipole or active layer sources
Publisher: The Optical Society
Date: 09-03-2017
DOI: 10.1364/OE.25.006192
Porous fibre: A novel THz waveguide
Publisher: IEEE
Date: 07-2008
Terahertz Waveguides and Materials
Publisher: IEEE
Date: 09-2006
Determining the geometric parameters of microbubble resonators from their spectra
Publisher: The Optical Society
Date: 05-12-2016
Single photon emission from nanodiamond in tellurite glass
Publisher: IEEE
Date: 08-2011
Terahertz dielectric waveguides
Publisher: The Optical Society
Date: 27-06-2013
DOI: 10.1364/AOP.5.000169
Self-formed cavity quantum electrodynamics in coupled dipole cylindrical-waveguide systems
Publisher: The Optical Society
Date: 02-05-2014
DOI: 10.1364/OE.22.011301
Highly nonlinear and dispersion-flattened fiber design for ultrafast phase-sensitive amplification
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2012
Nonlinear fibre design for broadband phase sensitive amplification
Publisher: IEEE
Date: 08-2011
Diamond in Tellurite Glass: a New Medium for Quantum Information
Publisher: Wiley
Date: 20-04-2011
Magnetically sensitive nanodiamond-doped tellurite glass fibers
Publisher: Springer Science and Business Media LLC
Date: 19-01-2018
DOI: 10.1038/S41598-018-19400-3
Abstract: Traditional optical fibers are insensitive to magnetic fields, however many applications would benefit from fiber-based magnetometry devices. In this work, we demonstrate a magnetically sensitive optical fiber by doping nanodiamonds containing nitrogen vacancy centers into tellurite glass fibers. The fabrication process provides a robust and isolated sensing platform as the magnetic sensors are fixed in the tellurite glass matrix. Using optically detected magnetic resonance from the doped nanodiamonds, we demonstrate detection of local magnetic fields via side excitation and longitudinal collection. This is a first step towards intrinsically magneto-sensitive fiber devices with future applications in medical magneto-endoscopy and remote mineral exploration sensing.
Optimizing the bandwidth and coherence of supercontinuum in soft glass microstructured fibers
Publisher: IEEE
Date: 05-2008
Emerging Nonlinear Optical Fibers: Revised Fundamentals, Fabrication and Access to Extreme Nonlinearity
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2009
Nonreciprocity in optical fiber radiation modes induced by spin–momentum locking
Publisher: Elsevier BV
Date: 05-2023
Enhancing the radiation efficiency of dye doped whispering gallery mode microresonators
Publisher: The Optical Society
Date: 18-09-2013
DOI: 10.1364/OE.21.022566
Polymer based whispering gallery mode laser for biosensing applications
Publisher: AIP Publishing
Date: 19-01-2015
DOI: 10.1063/1.4905931
Abstract: Whispering gallery mode lasers are of interest for a wide range of applications and especially biological sensing, exploiting the dependence of the resonance wavelengths on the surrounding refractive index. Upon lasing, the Q factors of the resonances are greatly improved, enabling measurements of wavelength shifts with increased accuracy. A way forward to improve the performance of the refractive index sensing mechanism is to reduce the size of the optical resonator, as the refractive index sensitivity is inversely proportional to the resonator dimensions. However, as the lasing threshold is believed to depend on the Q factor among other parameters, and the reduction of the microresonator size results in lower Q, this poses additional challenges for reaching the lasing threshold. In this letter, we demonstrate lasing in 10 μm diameter dye doped polystyrene microspheres in aqueous solution, the smallest polystyrene microsphere lasers ever reported in these conditions. We also investigate the dependence of the lasing threshold on the Q factor by changing the refractive index surrounding the sphere, highlighting a much stronger dependency than initially reported.
Novel low-loss bandgaps in all-silica Bragg fibers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2008
New frontiers in nano-scale highly nonlinear photonic circuits for System on System (SoS) Integration
Publisher: IEEE
Date: 2009
Symmetry breaking in directional coupling to radiation modes of a nanfofiber by dipole emission
Publisher: OSA
Date: 2018
Sensing with suspended-core optical fibers
Publisher: Elsevier BV
Date: 12-2010
Theoretical study of liquid-immersed exposed-core microstructured optical fibers for sensing
Publisher: Optica Publishing Group
Date: 04-06-2008
DOI: 10.1364/OE.16.009034
Abstract: The absorption and fluorescence sensing properties of liquid-immersed exposed-core microstructured optical fibers are explored for the regime where these structures act as supported nanowires with direct access to the sensing environment. For absorption-based sensing we demonstrate that the amount of power propagating in the sensing region of the exposed-core fiber can compete with that of traditional MOFs. For fluorescence-based sensing, we see that in addition to the enhanced fluorescence capture efficiency already predicted for small-core, high refractive index contrast fibers, an improvement of up to 29% can be gained by using liquid-immersed exposed-core fibers. Additionally, calculation of the losses associated with interfaces between filled and unfilled sections predict significant benefit in using high refractive index substrate glasses for liquid-immersed exposed-core fiber sensing. This work demonstrates that, for fiber dimensions of interest, the exposed-core fiber is an attractive new sensor technology.
Evaluation of a real-time BeO ceramic fiber-coupled luminescence dosimetry system for dose verification of high dose rate brachytherapy
Publisher: Wiley
Date: 09-10-2015
DOI: 10.1118/1.4931968
Abstract: The authors evaluate the capability of a beryllium oxide (BeO) ceramic fiber-coupled luminescence dosimeter, named radioluminescence/optically stimulated luminescence (RL/OSL) BeO FOD, for dosimetric verification of high dose rate (HDR) treatments. The RL/OSL BeO FOD is capable of RL and OSL measurements. The RL/OSL BeO FOD is able to be inserted in 6F proguide needles, used in interstitial HDR treatments. Using a custom built Perspex phantom, 6F proguide needles could be submerged in a water tank at 1 cm separations from each other. A second background fiber was required to correct for the stem effect. The stem effect, dose linearity, reproducibility, depth-dose curves, and angular and temperature dependency of the RL/OSL BeO FOD were characterised using an Ir-192 source. The RL/OSL BeO FOD was also applied to the commissioning of a 10 mm horizontal Leipzig applicator. Both the RL and OSL were found to be reproducible and their percentage depth-dose curves to be in good agreement with those predicted via TG-43. A combined uncertainty of 7.9% and 10.1% (k=1) was estimated for the RL and OSL, respectively. For the 10 mm horizontal Leipzig applicator, measured percentage depth doses were within 5% agreement of the published reference calculations. The output at the 3 mm prescription depth for a 1 Gy delivery was verified to be 0.99±0.08 Gy and 1.01±0.10 Gy by the RL and OSL, respectively. The use of the second background fiber under the current setup means that the two fibers cannot fit into a single 6F needle. Hence, use of the RL is currently not adequate for the purpose of in vivo brachytherapy dosimetry. While not real-time, the OSL is shown to be adequate for in vivo brachytherapy dosimetry.
Microwire fibers for low-loss THz transmission
Publisher: SPIE
Date: 27-12-2006
DOI: 10.1117/12.695785
Brillouin spectral deconvolution method for centimeter spatial resolution and high-accuracy strain measurement in Brillouin sensors
Publisher: Optica Publishing Group
Date: 04-2005
DOI: 10.1364/OL.30.000705
Abstract: Combining a dc and a short pulse (approximately 1 ns) as the probe beam in the pump-probe configuration of Brillouin-based distributed sensors allows us to represent the Brillouin spectrum as a top Lorentzian-like portion and a bottom Gaussian-like portion. Because of the interaction of these two parts, the Lorentzian-like portion carries spatial information that can be extracted within centimeter spatial resolution. Using this information, we develop a spectrum deconvolution method, which considers the location correlation of the strain distribution, to find the number of Brillouin peaks and their frequencies in the top Lorentzian-like portion and hence achieve accurate strain information. An optimum level of dc to pulse power for the best signal and position detection capability is discussed.
Design and optimization of fiber optical parametric oscillators for femtosecond pulse generation
Publisher: Optica Publishing Group
Date: 29-07-2010
DOI: 10.1364/OE.18.017294
Material candidates for optical frequency comb generation in microspheres
Publisher: The Optical Society
Date: 28-05-2015
DOI: 10.1364/OE.23.014784
Using CFD to derive reduced order models for heat transfer in particle curtains
Publisher: Inderscience Publishers
Date: 2015
A fibre optic fluorescence sensor to measure redox level in tissues
Publisher: SPIE
Date: 02-01-2018
DOI: 10.1117/12.2283352
A Unified Model for Active Multilayer Microsphere Resonators
Publisher: OSA
Date: 2016
Enhanced terahertz magnetic dipole response by subwavelength fiber
Publisher: AIP Publishing
Date: 06-02-2018
DOI: 10.1063/1.5010348
Abstract: Dielectric sub-wavelength particles have opened up a new platform for realization of magnetic light. Recently, we have demonstrated that a dipole emitter by a sub-wavelength fiber leads to an enhanced magnetic response. Here, we experimentally demonstrate an enhanced magnetic dipole source in the terahertz frequency range. By placing the fiber next to the hole in a metal screen, we find that the radiation power can be enhanced more than one order of magnitude. The enhancement is due to the excitation of the Mie-type resonances in the fiber. We demonstrate that such a system is equivalent to a double-fiber system excited by a magnetic source. This coupled magnetic dipole and optical fiber system can be considered a unit cell of metasurfaces for manipulation of terahertz radiation and is a proof-of-concept of a possibility to achieve enhanced radiation of a dipole source in proximity of a sub-wavelength fiber. It can also be scaled down to optical frequencies opening up promising avenues for developing integrated nanophotonic devices such as nanoantennas or lasers on fibers.
Electric and magnetic response of a coupled dipole-nanofiber system
Publisher: OSA
Date: 2016
THz porous fibers: design, fabrication and experimental characterization
Publisher: Optica Publishing Group
Date: 29-07-2009
DOI: 10.1364/OE.17.014053
Abstract: Porous fibers have been identified as a means of achieving low losses, low dispersion and high birefringence among THz polymer fibers. By exploiting optical fiber fabrication techniques, two types of THz polymer porous fibers--spider-web and rectangular porous fibers--with 57% and 65% porosity have been fabricated. The effective refractive index measured by terahertz time domain spectroscopy shows a good agreement between the theoretical and experimental results indicating a lower dispersion for THz porous fiber compared to THz microwires. A birefringence of 0.012 at 0.65 THz is also reported for rectangular porous fiber.
Evaluating the use of Silica and PMMA Optical Fibres as Proton Beam Monitors
Publisher: IOP Publishing
Date: 10-2020
DOI: 10.1088/1742-6596/1662/1/012029
Abstract: Recent reports have shown both poly (methyl methacrylate) (PMMA) and silica optical fibres to be ionization quenching free, making them possibly very useful dosimeters for proton beams. In this study, the response from PMMA and silica optical fibres to therapeutic proton beams are evaluated. The light output was recorded from both optical fibres, exposed to varying dose-rates of 0.5 Gy/min to 20 Gy/min from a 235 MeV isochronous cyclotron. The PMMA optical fibre was observed to have a linear dose-rate response, and a constant light emission for a constant dose-rate exposure. However, in the case of the silica optical fibres, the light output was observed to increase during a constant dose-rate exposure. If uncorrected, this accumulated dose sensitivity observed in the silica optical fibres can result in erroneous measurements.
Nonlinear optics in emerging waveguides: Revised fundamentals and implications
Publisher: Cambridge University Press
Date: 04-2010
Dependence of the Brillouin frequency shift on strain and temperature in a photonic crystal fiber
Publisher: Optica Publishing Group
Date: 07-2004
DOI: 10.1364/OL.29.001485
Abstract: The dependence of the Brillouin frequency shift on strain in a photonic crystal fiber (PCF) was measured at a wavelength of 1320 nm for the first time to the authors' knowledge. Together with measurements of the dependence of the Brillouin frequency shift on temperature in the PCF, we demonstrate the feasibility of the highly precise simultaneous measurement of temperature and strain by use of the PCF in a distributed Brillouin sensing system with a spatial resolution of 15 cm.
Understanding the contribution of mode area and slow light to the effective Kerr nonlinearity of waveguides
Publisher: The Optical Society
Date: 26-07-2013
DOI: 10.1364/OE.21.018558
Method for predicting whispering gallery mode spectra of spherical microresonators
Publisher: The Optical Society
Date: 10-04-2015
DOI: 10.1364/OE.23.009924
Full vectorial analysis of polarization effects in optical nanowires
Publisher: The Optical Society
Date: 14-06-2012
DOI: 10.1364/OE.20.014514
Plasmonic materials for metal–insulator–semiconductor–insulator–metal nanoplasmonic waveguides on silicon-on-insulator platform
Publisher: Elsevier BV
Date: 12-2013
Real-time in vivo dose measurement using ruby-based fibre optic dosimetry during internal radiation therapy
Publisher: Springer Science and Business Media LLC
Date: 03-07-2023
DOI: 10.1007/S13246-023-01288-7
Abstract: In vivo dosimetry (IVD) in a commonly used liver cancer treatment of selective internal radiation therapy (SIRT) has been done based on the post-treatment image-based dosimetry approach. Real-time IVD is necessary to verify the dose delivery and detect errors during the treatment for better patient outcomes. This study aims to develop a fibre optic dosimeter (FOD) for in vivo real-time dose rate measurement during internal beta radiation therapy, e.g., SIRT. A ruby fibre optic probe was prepared and studied the radioluminescence (RL) characteristics, including its major challenge of stem effect arising from Cherenkov radiation and luminescence from the irradiated fibre. The stem signal was suppressed adequately using the stem removal technique of optical filtering, and only 2.3 ± 1.1% stem signal was contributed to the measured RL signal. A linear dose rate response was observed during the exposure of the ruby probe to varying dose rates using a 6 MeV electron beam and a positron-emitting radionuclide fluorine-18. The ruby exhibited a temporally non-constant RL signal, which increased the RL signal by 0.84 ± 0.29 counts/sec 2 during the irradiation of the maximum dose rate used in this study of 9 Gy/min for 2 min. The ability of ruby FOD to measure the absolute dose rate with sufficient stem effect suppression and the linear RL dose rate response indicates its suitability for real-time IVD during internal beta radiation therapy. Future work will investigate the time-dependent RL characteristic of ruby and validate post-treatment image-based dosimetry using ruby-based FOD.
Balancing global city with global village
Publisher: Elsevier BV
Date: 12-1998
DOI: 10.1016/S0197-3975(98)00013-7
Abstract: The discourse on habitat and human settlements is increasingly dominated by that of the global, mega-city. If the aim of those of us in the human settlements field are to improve our understanding of and action on habitat and human settlements, this, often exclusive, focus is a mistake. Our habitat is better understood and acted upon as a network of interwoven settlements and surrounding countryside, large and small, themselves interwoven within our larger ecosystem. In this network the habitat of our smaller settlements (smaller cities, towns, villages) and rural areas and our global village also plays a critical role. The assumption can be challenged that urbanization and the mega-city are the critical issues of habitat and human settlements. Evidence suggests that with some rurbanization there is also counter urbanization, the ruralization of cities, and, perhaps most important, a growing urbanization as city-country interactions intensify. Habitat for all and habitat for a healthy, sustainable planet demands our openness to these new concepts and realities. It demands an integrated, balanced, approach which helps a wide range of living settlement nodes, large and small, to nurture each other. Global City and Global Village must go hand in hand. Our planetary and human health depends on it.
Fabrication and properties of lead-germanate glasses for high nonlinearity fibre applications
Publisher: Institution of Engineering and Technology
Date: 2013
DOI: 10.1049/CP.2013.1361
Enhancement of fluorescence-based sensing using microstructured optical fibres
Publisher: Optica Publishing Group
Date: 2007
DOI: 10.1364/OE.15.017891
Abstract: We develop a generic model of excitation and fluorescence recapturing within filled microstructured optical fibres (MOFs) with arbitrary structure and demonstrate that the light-matter overlap alone does not determine the optimal fibre choice. Fibre designs with sub-wavelength features and high-index glasses exhibit localised regions of high intensity, and we show that these regions can lead to approximately two orders of magnitude enhancement of fluorescence recapturing. Here we show how this regime can be exploited for sensing and demonstrate experimentally in-fibre excitation and fluorescence recapturing within a filled, solid-core MOF.
Dielectric resonator nanoantennas at visible frequencies
Publisher: The Optical Society
Date: 11-01-2013
DOI: 10.1364/OE.21.001344
The effect of subwavelength guidance on mode propagation and dispersion in high index optical waveguides
Publisher: IEEE
Date: 12-2010
Novel polymer functionalization method for exposed-core optical fiber
Publisher: The Optical Society
Date: 03-07-2014
DOI: 10.1364/OME.4.001515
Modification of well-aligned carbon nanotubes with dihexadecyl hydrogen phosphate: application to highly sensitive nanomolar detection of simvastatin
Publisher: Springer Science and Business Media LLC
Date: 10-12-2013
Dipole-fiber systems: radiation field patterns, effective magnetic dipoles, and induced cavity modes
Publisher: SPIE
Date: 22-12-2015
DOI: 10.1117/12.2204783
Optical fibre coated with diamond nanocrystal: Novel sensing architecture
Publisher: IEEE
Date: 08-2011
Light enhancement within nanoholes in high index contrast nanowires
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2011
CW pre-injection of pump-probe Brillouin sensors for high spatial and strain (temperature)resolutions
Publisher: SPIE
Date: 23-05-2005
DOI: 10.1117/12.624265
Characterisation of a real-time fibre-coupled beryllium oxide (BeO) luminescence dosimeter in X-ray beams
Publisher: Elsevier BV
Date: 06-2013
Modeling of stimulated Brillouin scattering in microstructured fibers
Publisher: SPIE
Date: 16-11-2004
DOI: 10.1117/12.567548
Porous fibers: a novel approach to low loss THz waveguides
Publisher: Optica Publishing Group
Date: 02-06-2008
DOI: 10.1364/OE.16.008845
Abstract: We propose a novel class of optical fiber with a porous transverse cross-section that is created by arranging sub-wavelength air-holes within the core of the fiber. These fibers can offer a combination of low transmission loss and high mode confinement in the THz regime by exploiting the enhancement of the guided mode field that occurs within these sub-wavelength holes. We evaluate the properties of these porous fibers and quantitatively compare their performance relative to that of a solid core air cladded fiber (microwire). For similar loss values, porous fibers enable improved light confinement and reduced distortion of a broadband pulse compared to microwires.
Low loss, low dispersion T-ray transmission in microwires
Publisher: IEEE
Date: 05-2007
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