ORCID Profile
0000-0001-6973-9231
Current Organisation
University of Technology Sydney
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: SPIE
Date: 26-09-2007
DOI: 10.1117/12.736284
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2013
Publisher: Springer Science and Business Media LLC
Date: 25-11-2019
DOI: 10.1038/S41598-019-53621-4
Abstract: Knowledge of the distribution of the aspect ratios (ARs) in a chemically-synthesized colloidal solution of Gold Nano Rods (GNRs) is an important measure in determining the quality of synthesis, and consequently the performance of the GNRs generated for various applications. In this work, an algorithm has been developed based on the Bellman Principle of Optimality to readily determine the AR distribution of synthesized GNRs in colloidal solutions. This is achieved by theoretically fitting the longitudinal plasmon resonance of GNRs obtained by UV-visible spectroscopy. The AR distribution obtained from the use of the algorithm developed have shown good agreement with those theoretically generated one as well as with the previously reported results. After bench-marking, the algorithm has been applied to determine the mean and standard deviation of the AR distribution of two GNRs solutions synthesized and examined in this work. The comparison with experimentally derived results from the use of expensive Transmission Electron Microscopic images and Dynamic Light Scattering technique shows that the algorithm developed offers a fast and thus potentially cost-effective solution to determine the quality of the synthesized GNRs specifically needed for many potential applications for the advanced sensor systems.
Publisher: The Electromagnetics Academy
Date: 2013
DOI: 10.2528/PIER13012305
Publisher: Laser Institute of America
Date: 17-04-2020
DOI: 10.2351/1.5135001
Abstract: This work presents the design and optimization of a cascade nano-laser using CH3NH3PbI3 perovskite. Due to increasing threshold gain with decreasing device size and high Auger losses, the use of perovskite as the active medium in the cascade nano-laser was proposed, as the material possesses a high emission rate in the visible wavelength region, with relative ease of device fabrication. By optimizing the thickness of the perovskite, its width, and the thickness of the silica used, photonic and plasmonic modes were created, which were further considered to permit the generation of lasing, using their respective Purcell factors. The pump wavelength considered was 400 nm, with the laser emission then at 537 nm. For suitability of plasmonic lasing, a Purcell factor FP of 1.22 is reported here, with no possibility for photonic lasing due to its FP value being less than 1 in this design. However, mode-crossing effects were observed in the plasmonic mode at λ = 400 nm for two designs: at a silica thickness of 27.5 nm with perovskite thickness and width of 100 and 300 nm, respectively, and at a silica thickness of 30 nm with perovskite thickness and width of 95 and 300 nm, respectively. These mode-crossing effects can be further analyzed to use these devices in the design of potential new sensor systems, mainly for gas and chemical sensing, exploiting the refractive index sensing capability as a means to determine the concentration of the gases, or other chemicals, under study.
Publisher: AIP
Date: 2012
DOI: 10.1063/1.4772164
Publisher: SPIE
Date: 25-04-2008
DOI: 10.1117/12.782348
Publisher: The Optical Society
Date: 26-10-2015
Publisher: IOP Publishing
Date: 07-2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR00619J
Abstract: Low surface roughness and large metal grain sizes improve the sensitivity of a plasmonic nanohole array sensor.
Publisher: IOP Publishing
Date: 12-2014
Publisher: OSA
Date: 2016
Publisher: Informa UK Limited
Date: 04-09-2014
Publisher: Springer Science and Business Media LLC
Date: 10-04-2019
DOI: 10.1038/S41598-019-39692-3
Abstract: A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2012
Publisher: OSA
Date: 2012
Publisher: SPIE
Date: 30-04-2010
DOI: 10.1117/12.849391
Publisher: Springer Science and Business Media LLC
Date: 05-09-2007
Publisher: Optica Publishing Group
Date: 06-2004
Abstract: A new method for solving the wave equation is presented that is nonparaxial and can be applied to wide-angle beam propagation. It shows very good stability characteristics in the sense that relatively larger step sizes can be taken. An implementation by use of the collocation method is presented in which only simple matrix multiplications are involved and no numerical matrix diagonalization or inversion is needed. The method is hence faster and is also highly accurate.
Publisher: IEEE
Date: 2005
Publisher: The Optical Society
Date: 18-05-2012
DOI: 10.1364/AO.51.003104
Publisher: Elsevier BV
Date: 02-2003
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2006
Publisher: SPIE
Date: 30-04-2010
DOI: 10.1117/12.849389
Publisher: Springer International Publishing
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 29-04-2010
Publisher: Optica Publishing Group
Date: 31-05-2010
DOI: 10.1364/AO.49.003173
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2009
Publisher: Elsevier BV
Date: 07-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2012
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2012
Publisher: Springer Science and Business Media LLC
Date: 2006
Publisher: Informa UK Limited
Date: 07-2013
Publisher: Optica Publishing Group
Date: 20-07-2004
DOI: 10.1364/AO.43.004225
Abstract: The perfectly matched layer (PML) boundary condition is generally employed to prevent spurious reflections from numerical boundaries in wave propagation methods. However, PML requires additional computational resources. We have examined the performance of the PML by changing the distribution of s ling points and the PML's absorption profile with a view to optimizing the PML's efficiency. We used the collocation method in our study. We found that equally spaced field s ling points give better absorption of beams under both optimal and nonoptimal conditions for low PML widths. At high PML widths, unequally spaced basis points may be equally efficient. The efficiency of various PML absorption profiles, including new ones, has been studied, and we conclude that for better numerical efficiency it is important to choose an appropriate profile.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2009
Publisher: IEEE
Date: 10-2011
Publisher: The Optical Society
Date: 02-12-2011
DOI: 10.1364/AO.50.006505
Publisher: IOP Publishing
Date: 07-2020
Abstract: The ability to control the interaction of light and matter at the nanoscale is at the heart of the field of nanophotonics. This subdiffractional confinement of light can be achieved through the stimulation of surface polaritons, most notably surface plasmon polaritons (SPPs). However, the high optical losses and lack of tunability of conventional plasmonic materials have hindered major progress in this field. In the search for alternative low-loss and tunable materials, graphene and polar dielectric materials are viewed as potential alternatives to more common metal-based plasmonic materials. In particular, the possibility of combining the tunable nature of graphene SPPs with the high-quality factors and long lifetimes of surface phonon-polaritons (SPhPs) modes supported in polar dielectric materials (e.g. SiC) offers great promise for advanced nanophotonic applications. The combination of graphene SPPs and SPhPs supported in SiC is even more pertinent as this material system can be realized in the form of epitaxial graphene (EG), whereby sublimation of silicon from a SiC results in a surface reconstruction into a graphene surface termination. This offers an ideal technology platform for realizing hybrid SPP-SPhP modes. In this review, we outline advances in graphene plasmonics and the generation of SPhPs in polar materials, in the context of epitaxial graphene. We review recent attempts at realizing such coupling of graphene SPPs with phonon and SPhP modes in SiC, as well as covering such modes in other polar materials and conclude with an overview of advantages and challenges for further advancement of nanophotonics based on graphene on silicon carbide for on-chip light manipulation.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2011
Publisher: Springer Science and Business Media LLC
Date: 31-08-2017
DOI: 10.1038/S41598-017-10141-3
Abstract: This article presents four different plasmonic structures using Graphene which yielded an efficient plasmonic mode with low loss for Supercontinuum(SC) generation. At an operating wavelength of 1550 nm in these structures, we generated a multi-octave broadband SC spectrum ranging from 1.5 um–25 um at a low input peak power of 1 W. Due to pumping in the anomalous dispersion region with two Zero Dispersion Wavelengths (ZDWs) and the process of cross phase modulation with soliton fission, red-shifted dispersive waves were generated which led to large broadening from 1.5 um–25 um. Two other Supercontinua ranging from 1–10 um and 0.85–2.2 um also at low input peak powers of 2 W and 0.1 W respectively were generated. These three supercontinua are useful for applications in the fields of biomedical sensors, spectroscopy, fluorescence lifetime imaging and in the design of many other new optical devices. Furthermore, we have also discussed our results on behaviour of Graphene as a metal, even without the negative real value of dielectric constant.
Publisher: SPIE
Date: 29-12-2010
DOI: 10.1117/12.897890
Publisher: SPIE
Date: 18-06-2004
DOI: 10.1117/12.528179
Publisher: Optica Publishing Group
Date: 14-11-2008
DOI: 10.1364/OL.33.002716
Abstract: A golden spiral photonic crystal fiber (GS-PCF) design is presented in which air holes are arranged in a spiral pattern governed by the golden ratio, where the design has been inspired by the optimal arrangement of seeds found in nature. The birefringence and polarization properties of this fiber are analyzed using a vectorial finite-element method. The fiber that is investigated shows a large modal birefringence peak value of 0.016 at an operating wavelength of 1.55 microm and exhibits highly tuneable dispersion with multiple zero dispersion wavelengths and also large normal dispersion. The GS-PCF design has identical circular air holes that potentially simplify fabrication. In light of its properties, the GS-PCF could have application as a highly birefringent fiber and in nonlinear optics, and moreover the 2D chiral nature of the pattern could yield exotic properties.
Publisher: IEEE
Date: 09-2014
Publisher: SPIE
Date: 18-06-2004
DOI: 10.1117/12.528172
Publisher: OSA
Date: 2007
Publisher: Springer Science and Business Media LLC
Date: 27-08-2008
Publisher: AIP Publishing
Date: 06-2012
DOI: 10.1063/1.4726055
Abstract: An Equiangular Spiral Photonic Crystal Fiber (ES-PCF) design in Topas® for use in the Terahertz regime is presented. The design shows ultra low bending loss and very low confinement loss compared to conventional Hexagonal PCF (H-PCF). The ES-PCF has excellent modal confinement properties, together with several parameters to allow the optimization of the performance over a range of important characteristics. A full vector Finite Element simulation has been used to characterize the design which can be fabricated by a range of techniques including extrusion and drilling.
Publisher: IOP Publishing
Date: 08-2018
Publisher: Springer International Publishing
Date: 2017
Publisher: SPIE
Date: 09-02-2006
DOI: 10.1117/12.654779
Publisher: Optica Publishing Group
Date: 23-10-2009
DOI: 10.1364/AO.48.00G131
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2018
End Date: 2019
Funder: University of New South Wales Canberra
View Funded Activity