时 间： 2017 年 12月 18 日 10：00- 11:30
地 点： 国家光电实验室 A302
报告人： Seng Tiong Ho 教授 （Northwestern University）
邀请人： 易飞 副教授
报告摘要：
Micro and nano lasers are of interest for potential applications to on-chip sensing, imaging, optical interconnects, and various other areas. In this talk, I will first review the physics involved in microcavity lasers. Microcavity lasers have properties that distinguish them from typical lasers. What are those properties? I will discuss the physics of spontaneous emission or spontaneous decay, and how spontaneous emission and decay can be modified with use of microcavities. In the context of microcavity lasers, I will describe the concepts of spontaneous-emission-coupling factor and the Purcell factor, and the relationship between them. I will then discuss how they affect the lasing properties of microcavity lasers. I will also discuss the quantum properties of light from microcavity lasers, and describe the idea of thresholdless lasers and light source with ultrafast modulation capability. Micrometer-scale and nanometer-scale (micro/nano) lasers, when properly designed, can take advantage of the unique capabilities of microcavity lasers. There are various approaches to realizing microscale or nanoscale microcavity lasers. I will first describe some of the early realization of micro/nano lasers that include VCSELs, microdisk lasers, and photonic-wire or microring lasers, I will then discuss more recent realization of micro/nano lasers that include photonic crystal lasers and plasmonic waveguide based lasers. I will summarize and compare the properties of these micro/nanolasers and discuss their interests.
片上集成式微纳激光器在传感，成像，光互连等领域有着广泛的潜在应用。与其它类型的激光器相比，微腔激光器有着独特的特性。本次报告在原理部分将探讨自发辐射与衰减的物理机制，光学微腔对自发辐射与衰减的调控作用，光学微腔中的自发辐射耦合系数、Purcell 因数等概念的内涵与关系，以及它们如何影响微腔激光器的激射性质。报告还将探讨微腔激光器的量子特性，无阈值激光器的概念以及激光器高速调制等内容。在技术部分，将探讨微腔激光器的早期实例，如垂直腔面发射激光器(VCSELs), 微盘激光器(microdisk lasers)，纳米线激光器(photonic-wire laser)以及微环激光器(microring lasers)等，以及最近实现的光子晶体激光器，表面等离激元波导激光器。最后，报告将就这些微腔激光器的性能及其应用进行比较与探讨。
报告人介绍：
Prof. Seng-Tiong Ho obtained his Ph.D., M.S., and B.S. in Electrical Engineering, and B.S. in Physics, from the Massachusetts Institute of Technology. He was a Technical Staff at the Quantum and Optical Physics Department of AT&T Bell Labs from 1989-1991 and joined Northwestern University as a faculty member in 1991. He is currently a Professor at the Electrical Engineering and Computer Science Department of Northwestern University. Ho has various awards and honors, including Fellow of the Optical Society of America, NSF Young Investigator Award, Newport Research Award of the Optical Society of America, and various invited lectureships. He has published widely and has contributed to various areas including: (1) Semiconductor Photonics: on monolithic photonic device integration, silicon photonics, DWDM chip technology, and III-V device modeling; (2) Nanophotonics: on photonic-wire semiconductor laser, quantum-dot microdisk laser, photonic bandgap structures, and ZnO random laser; (3) Optical Technology: on nonlinear optical devices and fiber-coupling platform; (4) Electro Optics: on self-assembled organic electro-optic modulator and ferroelectric thin-film modulator; and (5) Quantum Optics on non-classical light generation and quantum measurements. So far he has published 150 peer-reviewed journal papers, 178 conference papers including 53 invited talks and 7 book chapters.
