박남규 교수님의 지도교수셨던 분.
나는 CLEO Pacific Rim 행사장에 있어 참석 못 함.

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제   목 : Opto-mechanical cooling and microwave-oscillators on a silicon chip
강   사 : Prof. Kerry J. Vahala
소   속 : California Institute of Technology (Caltech), USA
시  간  : 2007년 8월 28일 오후 3시
장  소  : 301동 1121호

강사이력 :
DR. VAHALA is Ted and Ginger Jenkins Professor of Information Science and Technology and Professor of Applied Physics at Caltech. He also received his Ph. D. (85) in Applied Physics at Caltech. His research on micro-resonators has led to wafer-based devices operating in the Q regime above 100 million and has also provided low-loss methods for coupling directly to optical fiber.  These devices have enabled micro-scale Raman and Parametric sources as well as cavity QED on-a-chip systems. His current research is focused on a range of opto-mechanical phenomena associated with radiation pressure in microresonators. Vahala is a Fellow of the Optical Society of America, was the first recipient of the Richard P. Feynman Hughes Fellowship and has also received both the Presidential Young Investigator and Office of Naval Research Young Investigator Awards. He has been a topical editor for the Journal of the Optical Society of America and Photonics Technology Letters, and was program co-chair for CLEO 99 and General Chair for CLEO 2001.

Abstract : Recent years have witnessed a series of developments at the intersection of two, previously distinct subjects. Optical microcavities and micro (nano) mechanical resonators, each a subject in its own right with a rich scientific and technological history, have, in a sense, become entangled experimentally.  The results have implications in a wide range of subjects including improved gravity wave detection, new tests of quantum theory, and compact devices for metrology. They also suggest the beginning of an exciting period of experimental science. Central to these new results have been device geometries that enable structural coexistence of micro-mechanical and optical resonators. We will review the first such device to exhibit these phenomena. It takes the form of a micron-scale silica toroid that exhibits both high-Q radio-frequency mechanical resonances and optical resonances with Q's as high as 500 million. Radiation pressure associated with circulating photons couples mechanical and optical degrees of freedom in these devices. Both microwave-rate mechanical oscillation and sub-Kelvin cooling are demonstrated using this coupling. The prospects for new experimental science using the these results will be reviewed. Finally, other aspects of resonant build-up using ultra-high-Q physics will be reviewed including parametric oscillators, and micro-Watt threshold lasers.