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類別 光電所演講
講題 Manipulation and Interrogation of Colloidal Microsphere Cavities for Optofluidic Applications
講者
李明昌教授
國立清華大學電機系及光電所
時間 2018/10/19(五)14:20~16:00
地點 電機二館 R105
主辦單位 臺灣大學光電工程學研究所
講者簡介
Prof. Ming-Chang M. Lee received his Ph.D. degree in electrical engineering from University of California at Los Angeles (UCLA) in 2005. Before 2000, he was a supervisor at Fab 5 in Taiwan Semiconductor Manufacturing Company (TSMC). In 2005, he joined the faculty of the Institute of Photonics Technologies (IPT) and Department of Electrical Engineering, National Tsing Hua University (NTHU), Taiwan. Currently, he is a professor in IPT. He is also the R&D Director at Intelligent Application MicroSystem Division, Industrial Technology Research Institute (ITRI), Taiwan, for the development of Si photonics and optoelectronic devices.  His research interests include photonic MEMS, linear and nonlinear silicon photonics, high-speed Group IV optoelectronics, microwave photonics, nanophotonics and microfludic photonics. He has authors and coauthors over 100 journal and conference papers, including two invited book chapters, and holds 15 patents in Taiwan and US. Prof. Lee is a senior member of IEEE, and Optical Society of America (OSA). He served in the program committees of several technical conferences, including CLEO (2006~2008), WOCC (2012), CLEO Pacific Rim (2011), OMN (2015~present), MOC (2018) and OECC/PSC (2019). He received National Tsing Hua University Young Researcher Award in 2010, The 12th Far Eastern Y. Z. Hsu Science and Technology Paper Award and The Young Optoelectronic Researcher Award in Taiwan.

演講大綱 Optomechanics of colloidal microparticles has wide applications in biological analysis and sensing. One prominent example is optical tweezers. For colloidal microspheres or microdroplets, the optomechanical force can be magnified because of the cavity enhancement effect. However, it is difficult to analyze the force since the colloidal microspheres are suspended in liquid and are difficult to be immobilized. An integrated operation platform comprising waveguides and microelectromechanical systems is employed to study the cavity-enhanced optomechanics owing to the ability to precisely control the position of a suspended microsphere. Two intriguing optomechanical phenomena are presented in this study; one is self-adjustment of mode coupling and the other is optically induced mode volume expansion. The coupling condition of a suspended microsphere is autonomously adjusted, depending on the excitation power and the initial coupling gap at resonance. An optomechanical bistable mode coupling is reported for the first time in this study. Previously, static cavity mode volume expansion induced by radiation pressure in a microdroplet cavity is only predicted via theoretical analysis. Through this operation platform, a nonlinear wavelength detuning caused by mode volume expansion is experimentally verified for an immersion oil droplet, revealing a potential new metrology scheme to examine the surface free energy of a solution.
備註 修習專題演講課同學皆須出席。
 
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