Keynote Speakers | 主讲嘉宾

Prof. Robert Minasian, IEEE & OSA Fellow, The University of Sydney, Australia

Professor Minasian is a Chair Professor with the School of Electrical and Information Engineering at the University of Sydney, Australia. He is also the Director of the Fibre-optics and Photonics Laboratory. His research has made key contributions to microwave photonic signal processing. He is recognized as an author of one of the top 1% most highly cited papers in his field worldwide. Professor Minasian has contributed over 370 research publications, including Invited Papers in the IEEE Transactions and Journals, and Plenary and Invited papers at leading international conferences. Professor Minasian was the recipient of the ATERB Medal for Outstanding Investigator in Telecommunications, awarded by the Australian Telecommunications and Electronics Research Board. He is a Life Fellow of the IEEE, and a Fellow of the Optical Society of America.

Speech Title: Microwave photonic signal processing and sensing

Abstract: Photonic signal processing offers the prospect of overcoming a range of challenging problems in the processing of high-speed signals. Its intrinsic advantages of high time-bandwidth product and immunity to electromagnetic interference (EMI) have led to diverse applications. Photonic signal processing leverages the advantages of the optical domain to benefit from the wide bandwidth, low loss, and natural EMI immunity that photonics offers. Next generation global telecommunication platforms and emerging applications in radar, communications and sensing will require entirely new technologies to address the current limitations of electronics for massive capacity and connectivity. Microwave photonics, which merges the worlds of RF and photonics, shows strong potential as a key enabling technology to obtain new paradigms in the processing of high speed signals that can overcome inherent electronic limitations. In addition, the growth of silicon photonics allows integration together with CMOS electronics, to obtain future signal processing systems that can implement high bandwidth, fast and complex functionalities. Recent advances in microwave photonic signal processing are presented. These includes versatile beamforming and beam steering systems for phased array antennas, single bandpass microwave photonic filters, photonic-assisted scanning receivers for microwave frequency measurement, and microwave photonic sensing systems. These microwave photonic processors provide new capabilities for the realisation of high-performance signal processing and sensing. 

Prof. Ho Pui, Aaron HO, SPIE Fellow, The Chinese University of Hong Kong (CUHK), Hong Kong

Prof. Ho received his BEng and PhD in Electrical and Electronic Engineering from the University of Nottingham. Currently a professor in the Department of Biomedical Engineering, The Chinese University of Hong Kong (CUHK), he has been with the Department of Electronic Engineering and held positions as Associate Dean of Engineering, CUHK; Assistant Professor in Department of Physics and Materials Science, City University of Hong Kong; Senior Process Engineer for semiconductor laser fabrication in Hewlett-Packard. His service to the professional and academic community includes Chairman of Hong Kong Optical Engineering Society; Chairman of IEEE Electron Device/Solid-State Circuits (ED/SSC) Hong Kong Chapter, Admission Panel member of Technology Business Incubation Programme (IncuTech) operated by Hong Kong Science and Technology Parks Corporation (HKSTP); Council Member of The Technological and Higher Education Institute of Hong Kong (THEi). Started as a compound semiconductor materials scientist, his current academic interests focus at nano-sized semiconductor materials for photonic and sensor applications, optical instrumentation, surface plasmon resonance biosensors, lab-on-a-chip and biophotonics. He has published over 400 peer-reviewed articles, 33 Chinese and 6 US patents. He is a Fellow of SPIE and HKIE.

Speech Title: Surface Plasmon Resonance in Metallic Nano-structures: Sensing, Optofluidics and Optoelectronics

Abstract: Surface plasmons have been widely studied in many branches of physical sciences because of their unique properties associated with electromagnetic radiation-induced free electron movements. Surface plasmon resonance (SPR), in particular, which is well-known for the generation of highly localized energy intensity in the nanoscale, has been investigated for various applications including sensing and nanophotonics.
SPR biosensors typically measures the shifts in resonance, which may take the form of intensity dip, spectral absorption or optical phase jump, when target molecules are being captured and immobilized at the sensor surface. Among them, the SPR phase has been shown to be most sensitive for detecting target molecules. Various interferometer configurations have been reported to improve the resolution limit of SPR biosensors. Amongst them the spectral-phase interferometer has been shown to be most promising.
SPR absorption also results in strong ohmic heating. A focused laser beam may induce highly localized hotspot through plasmonic absorption in gold nano-islands. Temperature gradient-induced trapping, guided optofluidic flow and valving are readily achievable. By varying the incident power density, which in turn changes the temperature within the hot spot, one can readily perform a sequence of operations on living cells including trapping, cell lysis and DNA amplification. This approach opens the possibility of a performing genetic diagnosis from a small cluster of cells purely through laser irradiation.
Plasmonic localization also enhances the performance of gas sensors through a “catalytic” process by altering the carrier injection mechanism on the surface of the sensor material. This leads to the use of photon energy instead of conventional heating for gas sensing activation. We have demonstrated a room-temperature gas sensor scheme activated by plasmonic absorption in nano-sized metallic structures. By decorating gold nanoparticles (Au NPs) on the surface of ZnO NTPs through a physical evaporation process, we have incorporated localized surface plasmon resonance (LSPR) at the surface of the ZnO NTPs. The presence of LSPR has lowered the photon energy requirement for achieving light activation. In our experiments, the sensing response at 500 ppm ethanol has been improved from 5.5 to 62, i.e. an enhancement of over 10 times. We also observed improved sensing performance for other common organic vapors such as formaldehyde, acetone and methanol.