ORCID Profile
0000-0003-1477-5504
Current Organisations
University of Sydney
,
Nanyang Technological University
,
Michigan State University College of Agriculture and Natural Resources
,
Michigan State University College of Veterinary Medicine
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Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2017
Publisher: Optica Publishing Group
Date: 07-02-2020
DOI: 10.1364/OE.381601
Abstract: We fabricate suspended single-mode optical waveguides and ring resonators in 3C silicon carbide (SiC) that operate at telecommunication wavelength, and leverage post-fabrication thermal annealing to minimize optical propagation losses. Annealed optical resonators yield quality factors of over 41,000, which corresponds to a propagation loss of 7 dB/cm, and is a significant improvement over the 24 dB/cm in the case of the non-annealed chip. This improvement is attributed to the enhancement of SiC crystallinity and a significant reduction of waveguide surface roughness, from 2.4 nm to below 1.7 nm. The latter is attributed to surface layer oxide growth during the annealing step. We confirm that the thermo-optic coefficient, an important parameter governing high-power and temperature-dependent performance of SiC, does not vary with annealing and is comparable to that of bulk SiC. Our annealing-based approach, which is especially suitable for suspended structures, offers a straightforward way to realize high-performance 3C-SiC integrated circuits.
Publisher: IEEE
Date: 10-2015
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2017
Publisher: Informa UK Limited
Date: 03-03-2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2008
Publisher: Institution of Engineering and Technology (IET)
Date: 2006
DOI: 10.1049/EL:20061453
Publisher: IEEE
Date: 15-11-2021
Publisher: IEEE
Date: 03-2016
Publisher: IEEE
Date: 06-2015
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: IEEE
Date: 07-2006
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2014
Publisher: IEEE
Date: 10-2017
Publisher: IEEE
Date: 10-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-10-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2017
Publisher: The Optical Society
Date: 04-2013
DOI: 10.1364/OL.38.001164
Publisher: SPIE-Intl Soc Optical Eng
Date: 20-10-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2011
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-12-2021
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2015
Publisher: IEEE
Date: 07-2015
Publisher: Institution of Engineering and Technology (IET)
Date: 2009
DOI: 10.1049/EL.2009.0140
Publisher: SPIE
Date: 14-02-2018
DOI: 10.1117/12.2521515
Publisher: IEEE
Date: 10-2019
Publisher: IEEE
Date: 08-2015
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2009
Publisher: Elsevier BV
Date: 2016
Publisher: The Optical Society
Date: 23-09-2013
DOI: 10.1364/OE.21.022918
Publisher: Elsevier BV
Date: 07-2013
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: The Optical Society
Date: 21-12-2018
DOI: 10.1364/OL.43.000070
Publisher: IEEE
Date: 06-2013
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: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-07-2014
Publisher: Institution of Engineering and Technology (IET)
Date: 07-2014
DOI: 10.1049/EL.2014.1733
Publisher: Elsevier BV
Date: 2004
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-10-2022
Publisher: IEEE
Date: 06-2019
Publisher: Wiley
Date: 29-08-2016
DOI: 10.1002/MOP.30091
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2018
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: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2003
Publisher: SAGE Publications
Date: 02-11-2018
Abstract: A 19.5-y-old, male domestic yak ( Bos grunniens) with a history of sudden unexpected death was submitted for autopsy. The yak had hemoabdomen, and a large blood clot was attached to the liver and forestomachs. The hepatic artery had a saccular aneurysm with a 1-cm tear. The arterial wall at the site of the rupture was thin, and the luminal surface was roughened with yellow streaks. The arterial wall adjacent to the rupture was thickened, white, firm, and less elastic than normal arterial walls. Cause of death was concluded to be acute exsanguination. Similar cases with sudden death have been reported in domestic cattle and humans. No risk factors, such as nutritional deficiencies, genetic predisposition, or blunt trauma, were identified in this case, and there was no gross or histologic evidence of generalized vascular disease.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-01-2022
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: The Optical Society
Date: 15-11-2011
DOI: 10.1364/OL.36.004440
Publisher: The Optical Society
Date: 23-11-2010
DOI: 10.1364/OL.35.003934
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2020
Publisher: IEEE
Date: 06-2014
Publisher: IEEE
Date: 10-2011
Publisher: IEEE
Date: 2003
Publisher: Institution of Engineering and Technology (IET)
Date: 2011
DOI: 10.1049/EL.2011.0449
Publisher: IEEE
Date: 08-2015
Publisher: The Optical Society
Date: 25-02-2016
DOI: 10.1364/OE.24.004730
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: IEEE
Date: 06-2015
Publisher: Wiley
Date: 02-01-2019
DOI: 10.1002/MOP.31655
Publisher: The Optical Society
Date: 22-03-2019
DOI: 10.1364/OL.44.001662
Publisher: Elsevier BV
Date: 03-2013
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: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2012
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: Institution of Engineering and Technology (IET)
Date: 2009
DOI: 10.1049/EL.2009.1535
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2003
Publisher: IEEE
Date: 2005
Publisher: Wiley
Date: 25-10-2002
DOI: 10.1002/MOP.10602
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEO_SI.2020.STU3P.3
Abstract: We fabricate suspended single-mode optical waveguides and ring resonators in 3C-SiC that operate at telecommunication wavelength, leverage post-fabrication thermal annealing to minimize optical propagation losses and demonstrate Q of over 41,000.
Publisher: Optica Publishing Group
Date: 06-10-2003
DOI: 10.1364/OE.11.002634
Abstract: We propose a novel delay element for polarization mode dispersion (PMD) compensation by employing a tunable high-birefringence linearly chirped grating. The device can adjust differential group delay in a linearly continuous way and its performance is demonstrated by compensating 10-Gb/s signal with the first-order PMD. The tradeoff between PMD compensation capability of the device and the power penalty caused by the chromatic dispersion of the grating has also been studied.
Publisher: SAGE Publications
Date: 04-2012
DOI: 10.7227/IJEEE.49.2.3
Abstract: The design and implementation of a new project-based learning approach for student learning in laboratory communications electronics is presented. A new aspect of this approach is to inspire student learning by engaging them in real applications they can relate to, which is based on providing a platform for students to learn the subject at the level of communication systems and to structure it around electronic subsystems that integrate to form the complete system. The design of how to ide the large overall project into component integrative tasks that the students can manage is presented. The resulting integration of the in idual learning tasks into the project provided students with an understanding that addresses a holistic view. The big picture approach, followed by students' study and investigation of in idual elements in the subsystem and their integration to realise a real wireless radio communication link, demonstrated the benefits of project-based learning and enhanced engagement stimulating curiosity and discovery. The results of the student feedback survey indicated that students were highly motivated, and that the approach strongly supported their effective learning.
Publisher: IEEE
Date: 2002
Publisher: The Optical Society
Date: 10-02-2015
DOI: 10.1364/OE.23.004033
Publisher: Wiley
Date: 07-10-2022
DOI: 10.1111/JVIM.16563
Abstract: Equine influenza virus is a common cause of respiratory disease in equids. Few reports describe clinical presentation and disease progression in donkeys. Describe the clinical and diagnostic findings, outcome, and pathologic lesions associated with influenza pneumonia in donkeys. Thirteen unvaccinated donkeys ranging from 1 week to 12 years of age and sharing clinical signs and exposure history. Retrospective case series. Medical records from June to July 2020 at the Colorado State Veterinary Teaching Hospital and collaborating referring veterinary practices were reviewed. The diagnosis was confirmed by molecular testing, virus isolation, and partial genetic and phylogenetic analysis of the virus. Survival in donkeys year old was 16.6% (1/6) whereas survival in animals year of age was 85.7% (6/7). Hemagglutinin gene sequencing and phylogenetic analysis confirmed a contemporary clade 1 Florida sublineage H3 virus as the causative agent. Clinical signs of equine influenza virus infection in donkeys are similar to those observed in horses. Prognosis for survival generally is good, but deaths have been observed especially in foals born to seronegative dams. This finding emphasizes the importance of prenatal vaccination protocols in all equids, including donkeys.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2012
Publisher: IEEE
Date: 28-11-2021
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2012
Publisher: IEEE
Date: 2006
Publisher: The Optical Society
Date: 09-02-2012
DOI: 10.1364/OL.37.000608
Publisher: Optica Publishing Group
Date: 07-12-2021
DOI: 10.1364/OE.442867
Abstract: In this paper, we propose a microwave frequency measurement system that simultaneously achieves a large measurement range, high resolution, and linear frequency mapping in a compact configuration with a single laser and photodetector. The system is based on a novel dynamic microwave litude comparison function (ACF), which performs the power comparison in cascaded time intervals. The continuous movement of the dynamic ACF generates a series of steep and linear frequency-to-power mapping intervals, which can be seamlessly pieced together without sacrificing the frequency measurement range, thus breaking the trade-off between measurement resolution, linearity, and range. The proposed frequency measurement system is experimentally demonstrated by using an integrated silicon-on-insulator (SOI) microring resonator with an optical bandwidth of 1.8 GHz and outperforms current solutions by achieving a measurement resolution of over 80 dB/GHz throughout a frequency measurement range up to 20 GHz. Meanwhile, the highly linear system shows excellent accuracy where the average measurement error throughout the range is only 47.2 MHz, which is around 0.31% of the total measurement range.
Publisher: The Optical Society
Date: 07-05-2019
DOI: 10.1364/OE.27.014798
Publisher: The Optical Society
Date: 18-03-2011
DOI: 10.1364/OE.19.006231
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: Institution of Engineering and Technology (IET)
Date: 2010
DOI: 10.1049/EL.2010.2242
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2006
Publisher: SPIE
Date: 14-02-2019
DOI: 10.1117/12.2521773
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2010
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2020
Publisher: Wiley
Date: 2004
DOI: 10.1002/MOP.20026
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: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2552780
Publisher: IEEE
Date: 07-2018
Publisher: Optica Publishing Group
Date: 19-03-2009
DOI: 10.1364/OE.17.005358
Abstract: A new photonic signal processor structure that can realize multiple-taps, with a general response capability, low-noise and widely tunable processor operation, is presented. It is based on a novel concept of employing positive and negative group delay slopes simultaneously by means of a dual-fed chirped fiber Bragg grating, and a new wavelength mapping scheme that enables wavelength re-use. The technique offers scalability, arbitrary responses with both positive and negative taps, tunability, and high frequency operation. Experimental results demonstrate widely tunable filters, with arbitrary bipolar tap generation, no PIIN noise, and with high FSR.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2006
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2001
DOI: 10.1109/68.935827
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2023
Publisher: American Chemical Society (ACS)
Date: 03-06-2008
DOI: 10.1021/MA801057S
Location: United States of America
Location: United States of America
Start Date: 2009
End Date: 2011
Funder: Australian Research Council
View Funded ActivityStart Date: 2019
End Date: 2021
Funder: Australian Research Council
View Funded ActivityStart Date: 2011
End Date: 2015
Funder: Australian Research Council
View Funded ActivityStart Date: 2021
End Date: 2023
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 2020
Funder: Australian Research Council
View Funded ActivityStart Date: 2016
End Date: 2016
Funder: Australian Research Council
View Funded Activity