清华大学精仪系喜迎百年校庆学术活动之一

 

Development of Polymer Optical Waveguide Devices

Abstract: Low-cost planar lightwave circuits based on polymer optical waveguide devices hold promise for the next generation of optical communication systems. Over the years, we at City University of Hong Kong have devoted significant research effort to the development of polymer waveguide devices with the objective of exploring the many unique properties of polymer for the realization of new functional devices. For example, we have demonstrated zero-birefringence waveguides and polarization-insensitive directional couplers, where the stress and geometry effects in polymer thin films are balanced through careful waveguide design and thermal tuning. Using a long-period waveguide grating as the basic structure, we have demonstrated a range of tunable broadband filters, including band-rejection filters, bandpass filters, and add/drop multiplexers, where the large thermo-optic coefficient of polymer together with the high temperature sensitivity of the grating design allows an exceedingly wide wavelength range to be tuned thermally. Using vertical optical couplers as building blocks, we have demonstrated compact polarization splitters, thermo-optic switches, and dynamic power splitters. These three-dimensional devices take advantage of the fact that multi-layer structures can be formed easily with polymer. In addition to the conventional fabrication processes based on photolithography and reactive-ion etching, we have implemented a ultra-violet writing technique and an imprinting technique to enhance our waveguide fabrication capacity. Recently, we have proposed a new bottom-heating approach for the realization of thermo-optic waveguide devices, which can minimize the possibility of damaging the polymer waveguide due to electrode deposition and facilitate electric wiring and device packaging. This seminar presents a review of these research activities.

Biography: Professor Chiang received the B.E. (first-class Honours) and Ph.D. degrees in electrical engineering from the University of New South Wales, Australia, in 1982 and 1986, respectively. After spending six months in the Department of Mathematics, Australian Defence Force Academy, Canberra, he joined the Division of Applied Physics (also known as the National Measurement Laboratory), Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia, in 1986, and worked there as a Research Scientist/Senior Research Scientist till 1993. In 1987, he received a Japanese Government Research Award for Foreign Specialist and visited the Electrotechnical Laboratory in Tsukuba City, Japan, for six months. From 1992 to 1993, he worked concurrently for the Optical Fiber Technology Centre (OFTC) of the University of Sydney. He joined the City University of Hong Kong in 1993, where he is a Chair Professor. Professor Chiang has published over 400 papers in international journals and conference proceedings, as well as several book chapters. His research areas cover various aspects of the optical fiber and waveguide technology, including theory and modelling, measurement and characterization, device and sensor development, and nonlinear optical effects. He is a Fellow of the Optical Society of America, a recipient of the Croucher Award for 2000-2001, a recipient of 2005 K. C. Wong Education Foundation Sponsorship, and a Chang Jiang Chair Professor (2007 – 2010) at the University of Electronic Science and Technology of China.

 

郑建成教授分别于1982年和1986年取得澳大利亚新南威尔斯大学电机工程学学士学位和博士学位。

工作经验：1986：澳洲军校数学系研究员（半年）；1986 – 1993：澳洲联邦科学及工业研究组织应用物理部门暨国家计量局研究员/高级研究员（7年）；1987 – 1988：获日本政府外国专家研究奖，到日本筑波市电子综合研究所访问半年；1992 – 1993：澳洲光子学合作研究中心兼任研究员/科研组长；1993 – 现在：香港城市大学电子工程学系，現职讲座教授。

代表性学术成果：国际学术期刊及会议论文400余篇（包括近40篇特邀報告），书章数篇。主要研究成果包括提出现已被广泛使用的测量渐变型薄膜波导折射率分布的方法，发展新算法分析设计光纤和光波导，研制各种新型光纤和光波导（特别是光栅）器件和传感器等。

郑教授是美国光学学会会士(Fellow)。他于2000年获香港裘槎基金会颁“杰出研究者”奖； 2005年获香港王宽诚教育基金会学术讲座基金；2007年获中国教育部委任为中国电子科技大学长江讲座教授。