ORCID Profile
0000-0002-2887-4979
Current Organisation
University of Sydney
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Electrical and Electronic Engineering | Photonics and Electro-Optical Engineering (excl. Communications) |
Expanding Knowledge in Engineering | Communication Networks and Services not elsewhere classified | Expanding Knowledge in Technology
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2017
Publisher: IEEE
Date: 07-2016
Publisher: Optica Publishing Group
Date: 02-09-2022
DOI: 10.1364/OE.469529
Abstract: We measure the photothermal nonlinear response in suspended cubic silicon carbide (3C-SiC) and 3C-SiC-on-insulator (SiCOI) microring resonators. Bi-stability and thermo-optic hysteresis is observed in both types of resonators, with the suspended resonators showing a stronger response. A photothermal nonlinear index of 4.02×10 −15 m 2 /W is determined for the suspended resonators, while the SiCOI resonators demonstrate one order of magnitude lower photothermal nonlinear index of 4.32×10 −16 m 2 /W. Cavity absorption and temperature analysis suggest that the differences in thermal bi-stability are due to variations in waveguide absorption, likely from crystal defect density differences throughout the epitaxially grown layers. Furthermore, coupled mode theory model shows that the strength of the optical bi-stability, in suspended and SiCOI resonators can be engineered for high power or nonlinear applications.
Publisher: Informa UK Limited
Date: 03-03-2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2020
Publisher: IEEE
Date: 15-11-2021
Publisher: IEEE
Date: 10-2011
Publisher: Wiley
Date: 27-11-2021
Abstract: Herein, the impact and spin‐coating process of Nafion thin films on photonic nanowaveguide structures fabricated via a complementary metal–oxide–semiconductor compatible process for the first time is investigated. Particularly, the effect of Nafion thin films (≈23–776 nm) on microring resonators (MRRs) with compact waveguide sizes (480 nm by 220 nm and 380 nm by 220 nm) is focused on, where the microring provides enhanced interactions between the Nafion and light, which is related to Nafion thin‐film properties such as the refractive index, water uptake, and swelling. The results demonstrate small, compact, and cost‐effective MRR devices to characterize Nafion thin film and high‐resolution on‐chip humidity sensing for real‐time and continuous measurements.
Publisher: Institution of Engineering and Technology (IET)
Date: 2011
DOI: 10.1049/EL.2011.0449
Publisher: The Optical Society
Date: 25-02-2016
DOI: 10.1364/OE.24.004730
Publisher: IEEE
Date: 06-2015
Publisher: MDPI AG
Date: 04-01-2019
DOI: 10.3390/APP9010163
Abstract: Microwave photonics, based on optical filtering techniques, are attractive for wideband signal processing and high-performance sensing applications, since it brings significant benefits to the fields by overcoming inherent limitations in electronic approaches and by providing immunity to electromagnetic interference. Recent developments in optical filtering based microwave photonics techniques are presented in this paper. We present single sideband modulation schemes to eliminate dispersion induced power fading in microwave optical links and to provide high-resolution spectral characterization functions, single passband microwave photonic filters to address the challenges of eliminating the spectral periodicity in microwave photonic signal processors, and review the approaches for high-performance sensing through implementing microwave photonics filters or optoelectronic oscillators to enhance measurement resolution.
Publisher: The Optical Society
Date: 22-03-2019
DOI: 10.1364/OL.44.001662
Publisher: Wiley
Date: 02-01-2019
DOI: 10.1002/MOP.31655
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2014
Publisher: IEEE
Date: 08-2017
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C7F_1
Abstract: Recent advances in microwave photonic sensing techniques are presented in the paper with a focus on the usage of optoelectronic oscillators, microwave photonic interferometry configuration, and microwave photonic filters to enhance sensing performance. © 2020 The Authors
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C7F_3
Abstract: We demonstrate an integrated photonic crystal microring resonator sensor incorporating microwave photonic filtering technique. The results show 114-fold improvement in the resolution for temperature sensing and 50 dB notch rejection enhancement for magnetic field detection. © 2020 The Authors
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-10-2016
Publisher: The Optical Society
Date: 04-2013
DOI: 10.1364/OL.38.001164
Publisher: IEEE
Date: 12-2012
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2017
Publisher: SPIE-Intl Soc Optical Eng
Date: 20-10-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2015
Publisher: IEEE
Date: 09-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-12-2021
Publisher: IEEE
Date: 07-2015
Publisher: SPIE
Date: 14-02-2018
DOI: 10.1117/12.2521515
Publisher: IEEE
Date: 10-2019
Publisher: OSA
Date: 2019
Publisher: The Optical Society
Date: 10-02-2015
DOI: 10.1364/OE.23.004033
Publisher: Optica Publishing Group
Date: 14-09-2022
DOI: 10.1364/OE.466362
Abstract: We present the design, fabrication, and characterization of cascaded silicon-on-insulator photonic crystal microring resonators (PhCMRRs) for dual-parameter sensing based on a multiple resonances multiple modes (MRMM) technique. Benefitting from the slow-light effect, the engineered PhCMRRs exhibit unique optical field distributions with different sensitivities via the excitation of dielectric and air modes. The multiple resonances of two distinct modes offer new possibilities for enriching the sensing receptors with additional information about environmental changes while preserving all essential properties of traditional microring resonator based sensors. As a proof of concept, we demonstrate the feasibility of extracting humidity and temperature responses simultaneously with a single spectrum measurement by employing polymethyl methacrylate as the hydrophilic coating, obtaining a relative humidity (RH) sensitivity of 3.36 pm/%RH, 5.57 pm/%RH and a temperature sensitivity of 85.9 pm/°C, 67.1 pm/°C for selected dielectric mode and air mode, respectively. Moreover, the MRMM enriched data further forges the capability to perform mutual cancellation of the measurement error, which improves the sensing performance reflected by the coefficient of determination ( R 2 -value), calculated as 0.97 and 0.99 for RH and temperature sensing results, respectively.
Publisher: IEEE
Date: 24-11-2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2012
Publisher: IEEE
Date: 08-2017
Publisher: IEEE
Date: 10-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2012
Publisher: The Optical Society
Date: 09-02-2012
DOI: 10.1364/OL.37.000608
Publisher: The Optical Society
Date: 07-05-2019
DOI: 10.1364/OE.27.014798
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C11H_3
Abstract: We present a compact silicon-on-insulator multimode interference power splitter based on nonuniform optical waveguides, which achieves crosstalk reduction, a high uniformity and small device footprint while maintaining a low insertion loss.
Publisher: IEEE
Date: 15-12-2021
Publisher: The Optical Society
Date: 06-05-2012
DOI: 10.1364/OE.20.011517
Publisher: SPIE
Date: 14-02-2019
DOI: 10.1117/12.2521765
Publisher: The Optical Society
Date: 21-12-2018
DOI: 10.1364/OL.43.000070
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-07-2014
Publisher: The Optical Society
Date: 09-11-2012
DOI: 10.1364/OL.37.004699
Abstract: A new and simple structure for a single passband microwave photonic filter is presented. It is based on using an electro-optical phase modulator and a tunable optical filter and only requires a single wavelength source and a single photodetector. Experimental results are presented that demonstrate a single passband, flat-top radio-frequency filter response without free spectral range limitations, along with the capability of tuning the center frequency and filter bandwidth independently.
Publisher: SPIE
Date: 14-02-2019
DOI: 10.1117/12.2521773
Publisher: Institution of Engineering and Technology (IET)
Date: 07-2014
DOI: 10.1049/EL.2014.1733
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2016
Publisher: IEEE
Date: 10-2010
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-10-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2020
Publisher: IEEE
Date: 06-2019
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2014
Publisher: Springer Science and Business Media LLC
Date: 05-04-2022
DOI: 10.1038/S41467-022-29448-5
Abstract: Owing to its attractive optical and electronic properties, silicon carbide is an emerging platform for integrated photonics. However an integral component of the platform is missing—an electro-optic modulator, a device which encodes electrical signals onto light. As a non-centrosymmetric crystal, silicon carbide exhibits the Pockels effect, yet a modulator has not been realized since the discovery of this effect more than three decades ago. Here we design, fabricate, and demonstrate a Pockels modulator in silicon carbide. Specifically, we realize a waveguide-integrated, small form-factor, gigahertz-bandwidth modulator that operates using complementary metal-oxide-semiconductor (CMOS)-level voltages on a thin film of silicon carbide on insulator. Our device is fabricated using a CMOS foundry compatible fabrication process and features no signal degradation, no presence of photorefractive effects, and stable operation at high optical intensities (913 kW/mm 2 ), allowing for high optical signal-to-noise ratios for modern communications. Our work unites Pockels electro-optics with a CMOS foundry compatible platform in silicon carbide.
Publisher: IEEE
Date: 09-2012
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2552780
Publisher: MDPI AG
Date: 17-01-2019
DOI: 10.3390/APP9020328
Abstract: We present a novel technique based on matrix pencil assisted deconvolution to improve the measurement resolution in scanning receiver systems for microwave frequency measurements. By modeling the scanning receiver output as the cross-correlation of the input modulated signal with the filter’s spectral response and applying the matrix pencil algorithm to convolve the detected optical signal at the receiver output, our technique offers precise estimations of both the frequency and power information of microwave signals with an improved measurement resolution. A multi-tone microwave signal measurement based on an optical filter is experimentally demonstrated, showing a significant measurement resolution reduction from 1 GHz to 0.4 GHz for two radio frequency (RF) tones, which is only about 30.2% of the optical filter bandwidth.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2017
Publisher: IEEE
Date: 09-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2023
Publisher: Optica Publishing Group
Date: 2021
Abstract: A broadband, polarization-independent 3-dB power splitter using silicon-on-insulator strip and slot waveguides is presented, which achieves low insertion loss and small power imbalance while exhibiting a compact size.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-01-2022
Publisher: IEEE
Date: 10-2018
Start Date: 2021
End Date: 2023
Funder: Australian Research Council
View Funded ActivityStart Date: 2021
End Date: 12-2024
Amount: $405,000.00
Funder: Australian Research Council
View Funded Activity