ORCID Profile
0000-0002-9326-1589
Current Organisation
University of Western Australia
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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.
Microelectromechanical Systems (MEMS) | Photonics and Electro-Optical Engineering (excl. Communications) | Mechanical Engineering | Microelectronics and Integrated Circuits | Materials Engineering not elsewhere classified | Electrical and Electronic Engineering | Technology not elsewhere classified | Photodetectors, Optical Sensors and Solar Cells |
Environmentally Sustainable Plant Production not elsewhere classified | Emerging Defence Technologies | Expanding Knowledge in Engineering | Integrated Circuits and Devices | Mineral Exploration not elsewhere classified | National Security | Scientific Instruments | Expanding Knowledge in the Physical Sciences | Integrated Systems | Expanding Knowledge in Technology
Publisher: MDPI AG
Date: 08-08-2023
DOI: 10.3390/BIOM13081230
Abstract: Diabetes affects the structure of the blood vessel walls. Since the blood vessel walls are made of birefringent organized tissue, any change or damage to this organization can be evaluated using polarization-sensitive optical coherence tomography (PS-OCT). In this paper, we used PS-OCT along with the blood vessel wall birefringence index (BBI = thickness/birefringence2) to non-invasively assess the structural integrity of the human retinal blood vessel walls in patients with diabetes and compared the results to those of healthy subjects. PS-OCT measurements revealed that blood vessel walls of diabetic patients exhibit a much higher birefringence while having the same wall thickness and therefore lower BBI values. Applying BBI to diagnose diabetes demonstrated high accuracy (93%), sensitivity (93%) and specificity (93%). PS-OCT measurements can quantify small changes in the polarization properties of retinal vessel walls associated with diabetes, which provides researchers with a new imaging tool to determine the effects of exercise, medication, and alternative diets on the development of diabetes.
Publisher: SPIE
Date: 21-05-2014
DOI: 10.1117/12.2053505
Publisher: OSA
Date: 2017
Publisher: SPIE-Intl Soc Optical Eng
Date: 23-08-2023
Publisher: IEEE
Date: 12-2018
Publisher: AIP Publishing
Date: 26-03-2019
DOI: 10.1063/1.5075525
Abstract: This work presents a study of photostriction-based optical actuation in bilayer cantilevers made of silicon and germanium thin-films and follows previous work in this area on silicon cantilevers. This experimental and theoretical study examines the role of the silicon-germanium heterojunction in optical actuation. It is shown that the germanium layer dominates the mechanical response of the device, which can be exploited to achieve enhanced optical actuation in cantilevers.
Publisher: Optica Publishing Group
Date: 16-11-2022
DOI: 10.1364/OE.475649
Abstract: We report here the first demonstration of a cryogenic mid-wave infrared (MWIR) hyperspectral fixed-cavity Fabry-Perot filter based on a suspended tensile-strained single-layer 2-D subwavelength grating (SWG) mirror. Optical design optimization of the 2-D SWG mirror and parameter tolerance study are performed. For the first time, process control of grating air-hole sidewall angle and the grating air-hole fill-factor fabrication error caused by e-beam lithography electron-scattering effect is reported. At 80 K, namely the operating temperature of MWIR photodetectors, the as-fabricated suspended 2-D SWG mirror has achieved excellent surface flatness with a slight center-to-edge bowing of 15 nm over a 1-mm 2 large mirror area and a high average reflectivity of 0.97 across a wavelength range of 3.72-5 µm, which represents an unprecedentedly wide fractional bandwidth Δλ/λ c of 30%. The cryogenically cooled Fabry-Perot filter exhibits an unrivaled high spectral resolution of 10 nm that far exceeds the optical requirement for MWIR hyperspectral imaging applications.
Publisher: IEEE
Date: 12-2018
Publisher: SPIE
Date: 31-05-2005
DOI: 10.1117/12.603519
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2008
Publisher: Wiley
Date: 06-2004
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2005
Publisher: Springer Science and Business Media LLC
Date: 2014
DOI: 10.1557/OPL.2014.145
Abstract: We report on the preparation and characterization of crystalline bismuth oxide thin films via Biased Target Ion Beam Deposition method. A focused blue laser (405nm) is used to write an array of dots in the bismuth oxide thin film and demonstrate clear and circular recording marks in form of “bubbles” or “little volcanos” (FWHM ∼500nm). Results indicate excellent static recording characteristics, writing sensitivity and contrast. The recording mechanism is investigated and is believed to be related to laser-induced morphology change.
Publisher: SPIE
Date: 13-05-2011
DOI: 10.1117/12.883601
Publisher: Springer Science and Business Media LLC
Date: 11-10-2023
Publisher: Optica Publishing Group
Date: 28-11-2005
Abstract: The design, micro-fabrication, and electronic and optical performance of a tuneable short-wavelength infrared Fabry-Pérot microresonator on a mercury cadmium telluride photoconductor is presented. The maximum processing temperature of 125 degrees C has negligible effect on the electronic and optical performance of photoconductor test structures. Maximum responsivity, effective carrier lifetime and detectivity are 60x103 VW-1, 2x10-5 s and 8x1010 cmHz1/2W-1, respectively. The maximum effective carrier lifetime and specific detectivity are in good agreement with the theoretical maxima. Uncooled device operation is possible since responsivity is observed not to improve with thermo-electric cooling. Spectral tuning of the micro-filters is demonstrated over the wavelength range 1.7 to 2.2 mum using drive voltages up to 8 V, with the full-width-half-maximum of the resonance approximately 100 nm. Membrane deflection can be up to 40% of the cavity width.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2015
Publisher: IEEE
Date: 12-2012
Publisher: SPIE
Date: 23-04-2010
DOI: 10.1117/12.850589
Publisher: IEEE
Date: 12-2006
Publisher: IEEE
Date: 12-2013
Publisher: SPIE
Date: 21-04-2006
DOI: 10.1117/12.662539
Publisher: Elsevier BV
Date: 02-2019
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2019
Publisher: Optica Publishing Group
Date: 03-10-2022
DOI: 10.1364/OME.471630
Abstract: We report the first study of the effects of grating fill-factor variation and sidewall angle on 2-D subwavelength grating shortwave infrared mirrors, and the first development of a geometry compensation approach to correct for the grating fill-factor patterning error caused by EBL proximity effect and a plasma etching process based on CHF 3 passivation to control grating sidewall angle. Mirrors with a large grating air-hole diameter-to-pitch ratio of 0.954 and vertical sidewall angle of 89.8° are demonstrated with an average reflectivity of 99% over an ultrabroad wavelength range of 560 nm (1.92-2.48 µm), which represents an unprecedented fractional bandwidth of 26%.
Publisher: IEEE
Date: 12-2014
Publisher: Wiley
Date: 12-09-2022
Abstract: Evolving from past black‐and‐white images, through present red‐green‐blue spectral colors, future remote imaging systems promise spectroscopic functionalities extending well beyond the visible wavelengths. This allows real‐time spectral information to be gathered from multiple wavelength bands that is applicable to numerous remote sensing spectroscopy/imaging applications and aids target recognition. This paper reviews the wavelength tunable microelectromechanical systems (MEMS) optical filter technologies developed for the important infrared and the emerging terahertz wavelength bands of the electromagnetic spectrum with the fabrication effort being enabled by the Western Australian Node of the Australian National Fabrication Facility. A low size, weight and power (SWaP) platform solution is demonstrated delivering mechanically robust, field‐portable, spectroscopic, chem/bio sensing suitable for deployment in remote sensing and imaging applications.
Publisher: IEEE
Date: 12-2018
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2017
Publisher: SPIE
Date: 07-07-2005
DOI: 10.1117/12.624884
Publisher: Elsevier BV
Date: 2024
Publisher: SPIE
Date: 07-12-2013
DOI: 10.1117/12.2034955
Publisher: Springer Science and Business Media LLC
Date: 08-08-2008
Publisher: IEEE
Date: 12-2018
Publisher: IEEE
Date: 12-2018
Publisher: SPIE
Date: 05-05-2006
DOI: 10.1117/12.673010
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2015
Publisher: SPIE
Date: 31-08-2006
DOI: 10.1117/12.685469
Publisher: IEEE
Date: 12-2012
Publisher: IEEE
Date: 12-2013
Publisher: Springer Science and Business Media LLC
Date: 16-11-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2015
Publisher: SPIE-Intl Soc Optical Eng
Date: 04-01-2022
Publisher: Springer Science and Business Media LLC
Date: 06-2005
Publisher: SPIE
Date: 2012
DOI: 10.1117/12.919060
Publisher: SPIE
Date: 09-10-2019
DOI: 10.1117/12.2534282
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2017
Publisher: IEEE
Date: 05-2011
Publisher: IEEE
Date: 12-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2017
Publisher: SPIE
Date: 07-12-2013
DOI: 10.1117/12.2033755
Publisher: Springer Science and Business Media LLC
Date: 28-08-2017
DOI: 10.1038/MICRONANO.2017.33
Abstract: The realization of high-performance tunable absorbers for terahertz frequencies is crucial for advancing applications such as single-pixel imaging and spectroscopy. Based on the strong position sensitivity of metamaterials’ electromagnetic response, we combine meta-atoms that support strongly localized modes with suspended flat membranes that can be driven electrostatically. This design maximizes the tunability range for small mechanical displacements of the membranes. We employ a micro-electro-mechanical system technology and successfully fabricate the devices. Our prototype devices are among the best-performing tunable THz absorbers demonstrated to date, with an ultrathin device thickness (~1/50 of the working wavelength), absorption varying between 60% and 80% in the initial state when the membranes remain suspended, and fast switching speed (~27 μs). The absorption is tuned by an applied voltage, with the most marked results achieved when the structure reaches the snap-down state. In this case, the resonance shifts by % of the linewidth (14% of the initial resonance frequency), and the absolute absorption modulation measured at the initial resonance can reach 65%. The demonstrated approach can be further optimized and extended to benefit numerous applications in THz technology.
Publisher: Institution of Engineering and Technology
Date: 2019
DOI: 10.1049/CP.2019.1242
Publisher: SPIE
Date: 07-2012
DOI: 10.1117/12.531272
Publisher: Elsevier BV
Date: 2012
Publisher: Optica Publishing Group
Date: 15-01-2003
DOI: 10.1364/OL.28.000117
Abstract: We propose and demonstrate a novel technique, which we term bifocal optical coherence refractometry, for the rapid determination of the refractive index of a turbid medium. The technique is based on the simultaneous creation of two closely spaced confocal gates in a s le. The optical path-length difference between the gates is measured by means of low-coherence interferometry and used to determine the refractive index. We present experimental results for the refractive indices of milk solutions and of human skin in vivo. As the axial scan rate determines the acquisition time, which is potentially of the order of tens of milliseconds, the technique has potential for in vivo refractive-index measurements of turbid biological media under dynamic conditions.
Publisher: IEEE
Date: 08-2007
Publisher: Wiley
Date: 29-10-2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2015
Publisher: Optica Publishing Group
Date: 15-11-2000
DOI: 10.1364/OL.25.001645
Abstract: We propose and demonstrate a novel detection technique, based on a modified electronic phase-locked loop, for Doppler optical coherence tomography. The technique permits real-time simultaneous reflectivity and continuous, bidirectional velocity mapping in turbid media over a wide velocity range with minimal sensitivity penalty compared with conventional optical coherence tomography, which is a major advance over current postprocessing and discrete parallel detection techniques.
Publisher: Optica Publishing Group
Date: 23-06-2021
DOI: 10.1364/BOE.426079
Abstract: A new method based on polarization-sensitive optical coherence tomography (PS-OCT) is introduced to determine the polarization properties of human retinal vessel walls, in vivo . Measurements were obtained near the optic nerve head of three healthy human subjects. The double pass phase retardation per unit depth (DPPR/UD), which is proportional to the birefringence, is higher in artery walls, presumably because of the presence of muscle tissue. Measurements in surrounding retinal nerve fiber layer tissue yielded lower DPPR/UD values, suggesting that the retinal vessel wall tissue near the optic nerve is not covered by retinal nerve fiber layer tissue (0.43°/µm vs. 0.77°/µm, respectively). Measurements were obtained from multiple artery-vein pairs, to quantify the different polarization properties. Measurements were taken along a section of the vessel wall, with changes in DPPR/UD up to 15%, while the vessel wall thickness remained relatively constant. A stationary scan pattern was applied to determine the influence of involuntary eye motion on the measurement, which was significant. Measurements were also analyzed by two examiners, with high inter-observer agreement. The measurement repeatability was determined with measurements that were acquired during multiple visits. An improvement in accuracy can be achieved with an ultra-broad-bandwidth PS-OCT system since it will provide more data points in-depth, which reduces the influence of discretization and helps to facilitate better fitting of the birefringence data.
Publisher: SPIE
Date: 17-05-2013
DOI: 10.1117/12.2018431
Publisher: Optica Publishing Group
Date: 15-12-2003
DOI: 10.1364/OE.11.003503
Abstract: We demonstrate tomographic imaging of the refractive index of turbid media using bifocal optical coherence refractometry (BOCR). The technique, which is a variant of optical coherence tomography, is based on the measurement of the optical pathlength difference between two foci simultaneously present in a medium of interest. We describe a new method to axially shift the bifocal optical pathlength that avoids the need to physically relocate the objective lens or the s le during an axial scan, and present an experimental realization based on an adaptive liquid-crystal lens. We present experimental results, including video clips, which demonstrate refractive index tomography of a range of turbid liquid phantoms, as well as of human skin in vivo.
Publisher: OSA
Date: 2014
Publisher: IEEE
Date: 12-2012
Publisher: Elsevier BV
Date: 10-2019
DOI: 10.1016/J.ULTRAMIC.2019.05.011
Abstract: The most common readout technique used in atomic force microscopy (AFM) is based on optical beam deflection (OBD), which relies on monitoring deflection of the cantilever probe by measuring the position of the laser beam reflected from the free end of the AFM cantilever. Although systems using the OBD readout can achieve subnanometre displacement resolution and video rate imaging speeds, its main limitation is size, which is difficult to minimise, thus limiting multiprobe imaging capability. Currently, system miniaturisation has been accommodated by adopting on-chip electrical readout solutions, often at the expense of measurement sensitivity. To date, no cost-effective AFM readout solution exists without sacrificing either measurement sensitivity, system miniaturisation, or multiprobe array scalability. In this paper we present an AFM probe with integrated on-chip optical interferometric readout based on silicon photonics. Our AFM probe combines the advantages of subnanometre resolution of optical readouts with on-chip miniaturisation. The adopted approach determines deflection of the cantilever using an integrated on-chip photonics waveguide by monitoring the separation between the sensing cantilever and an interrogating grating. The implemented methodology provides ultimate interferometric resolution and sensitivity, on-chip miniaturisation, and array scalability, which makes possible ultrafast multiprobe-array AFM imaging. Using a Digital Instruments D3000 AFM retrofitted with our cantilever probe and integrated readout, we report sub-nanometre AFM topography images obtained on reference s les. We demonstrate RMS static AFM noise level of 19 pm, outperforming the operation of this system in its standard, optical beam deflection configuration (51 pm). The noise spectrum measurements of our probe indicate that the integrated readout is shot noise limited, achieving a deflection noise density (DND) of 36fm/Hz.
Publisher: IEEE
Date: 12-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2015
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2015
Publisher: IEEE
Date: 09-2013
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2006
Publisher: Elsevier BV
Date: 12-2017
Publisher: SPIE-Intl Soc Optical Eng
Date: 19-05-2022
Publisher: QIRT Council
Date: 2012
Publisher: IEEE
Date: 08-2018
Publisher: Institution of Engineering and Technology (IET)
Date: 1999
DOI: 10.1049/EL:19990989
Publisher: SPIE
Date: 27-04-2007
DOI: 10.1117/12.718969
Publisher: Springer Science and Business Media LLC
Date: 07-01-2022
Start Date: 12-2016
End Date: 12-2017
Amount: $510,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 02-2012
End Date: 02-2015
Amount: $600,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2016
End Date: 05-2019
Amount: $400,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 08-2012
End Date: 12-2015
Amount: $490,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 10-2022
End Date: 10-2024
Amount: $580,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2016
End Date: 12-2017
Amount: $610,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2013
End Date: 12-2015
Amount: $200,000.00
Funder: Australian Research Council
View Funded Activity