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附1：
Recent Progress on Compact Silicon Waveguide Polarizers and Plasmonic Couplers
Hon Ki Tsang
Electronic Engineering, The Chinese University of Hong Kong
Abstract:
Nanoscale photonic integration of hundreds of photonic components on a CMOS chip has been demonstrated, but the number of monolithic photonic devices is still many orders of magnitude less than that of the billions of transistors present in microprocessors. This large disparity in the number of photonic and electronic devices on the same chip arises because of the limitation in how small conventional silicon photonic devices can be made. In this talk we shall describe our recent work in two different approaches to enable the integration of smaller photonic devices. One approach for smaller photonic devices is to exploit the guiding of light at metal-dielectric interfaces from surface plasmon-polariton (SPP) modes. Plasmonic devices not only offer the advantage of smaller size, but in the case of optical modulators they can also provide higher energy efficiency and high speed operation. One important challenge for plasmonic devices on silicon chips is how to couple light efficiently into the plasmonic device. We shall present some of the different designs of nanophotonic couplers to couple light efficiently from a conventional silicon waveguide to a plasmonic slot waveguide. Another approach to make smaller photonic devices is to exploit the photonic bandgap of nanophotonic structures for highly compact resonators, filters or polarizers. Unlike convention photonic crystals which require high precision in the periodicity of the photonic lattice, photonic bandgaps from hyperuniform disordered structures are more tolerant to fabrication errors. We shall describe a waveguide polarizer with over 30 dB extinction ratio over a 98 nm optical bandwidth that occupies a short length of 8 μm (including the waveguide tapers) based on a hyperuniform disordered photonic bandgap structure.
About the speaker:
Hon Ki Tsang received the B.A. (Hons) degree in 1987 in Engineering (Electrical and Information Sciences), and the Ph.D. and M.A. degrees in 1991, all from the University of Cambridge. He joined the Chinese University of Hong Kong (CUHK) in 1993 as a lecturer, advancing to Associate Professor and Professor in 1996 and 2003 respectively. Since 2010 he has been serving as chairman of the Department of Electronic Engineering, CUHK. He is also concurrently Director of the Center for Advanced Research in Photonics at CUHK. Hon Tsang has published over 300 papers in journals or conference proceedings. His recent research interests are in silicon photonics and waveguide components for communication applications, graphene on silicon photonics and on-chip mode division multiplexing.
附2：
Photonics Meets Mechanics in the Nanoworld
Xiankai Sun
Electronic Engineering, The Chinese University of Hong Kong
Abstract:
Optomechanics has witnessed its great success in detecting the first ever gravitational waves produced by collision and merger of two black holes about 1.3 billion light years away, which confirms a major prediction of Albert Einstein’s general theory of relativity and opens an unprecedented new window on the universe. Optomechanical systems have shown their unique advantages in fundamental research as well as practical applications in high-precision metrology, signal processing, and data communication. Optomechanical devices exhibit many variations with their sizes and mechanical masses spanning orders of magnitude. Going to the other end of the spectrum, I will talk about our experimental research of integrated nanoscale optomechanical and optoelectromechanical devices with pico/femtogram masses and gigahertz vibrational frequencies. These integrated devices hold great promise for many burgeoning areas in science and engineering, such as single-molecule detection, laser cooling, and quantum information processing.
About the speaker:
Xiankai Sun received his Ph.D. degree in Applied Physics from California Institute of Technology, USA, in 2010. After that, he worked in Department of Electrical Engineering at Yale University, USA, first as a Postdoctoral Research Associate and then as an Associate Research Scientist. He joined Department of Electronic Engineering at the Chinese University of Hong Kong, Hong Kong, in 2014, where he is currently an Assistant Professor. He is a finalist of the 2013 Blavatnik Awards for Young Scientists by New York Academy of Sciences. He received the 2015 Early Career Award by Hong Kong Research Grants Council. His research interests include nanophotonics, optoelectronics, optomechanics, and nanoelectromechanics.
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