光学微环谐振器，自从1969年作为滤波器件被提出以后，就受到了很大的关注。光学微环谐振器，可以作为一种通用设备用于实现通信与信号处理中的所有一般功能，比如滤波、复用/解复用、调制、开关、延时、门电路、路由、传感和放大等。小尺寸的微环有优异的特性：宽带宽高精细度。这些特性非常有利于非线性光学应用。高的精细度意味着环中高的储存能量，而且可以通过进一步减小模场面积再次提高，并且不牺牲带宽。因为利用平面工艺易于获得微环，所以其非常适合大规模集成。在此次报告中，先简单介绍一下微腔的概念，然后具体介绍一下微环谐振器，介绍马里兰大学的一些主要工作，最后分析一下这种技术的挑战和发展前景。 The optical micro-ring resonator, first proposed in 1969 as a simple filter, has now been demonstrated to be a versatile device capable of performing all the common functions in communications and signal processing: filtering, multiplexing/demultiplexing, modulation, switching, delay, gating, routing, sensing, amplification. The small dimensions of the rings place them in a very interesting operational parameter range: wide bandwidth yet high finesse. These properties are especially attractive for nonlinear optical applications. The high finesse means high stored intensities in the rings as in any resonator, which is further enhanced by the small model area, yet the bandwidth is not sacrificed. Small and easy to fabricate with planar technology, they are particularly suitable for large-scale integration. After a brief introduction to micro-resonators in general and micro-ring resonators in particular, I will present our work in Maryland as well as work elsewhere. The talk will conclude with a discussion on the challenges and prospects of this technology. 报告人简介Introduction to the speaker： 何炳堂（Ping-Tong Ho）教授，现为美国马里兰大学教授、清华大学客座教授。1950 年生于广州，于1973年、1975年、1978年在美国麻省理工学院分别获得物理学学士、硕士、博士学位。1978开始在英国帝国理工学院从事博士后研究；1979年开始在美国南加州大学从事科学研究；1982年至今任职于美国马里兰大学。他一直致力于光学、激光、微波、半导体光学器件的研究，首次实现半导体激光器的锁模，首次实现连续钕玻璃激光器的锁模与放大，首次利用半导体锁模激光器产生皮秒脉冲，首次实现1.5微米的光编址空间光调制器，首次实现半导体激光器与介质波导的集成，首次发现双稳态光器件中的瞬时开关现象，首次观察到多晶ZnSe的非线性性能，首次利用金刚钻实现光开关，首次利用ZnSe实现光开关，首次延伸Schawlow-Townes公式至锁模激光器，提出回旋腔的量子理论、自由电子激光器的量子理论和Child-Langmuir定律的量子延伸。最近他一直致力于微环谐振器的研究，第一次证明了多个微环的器件和提高的非线性效应。先后讲授过包括半导体、光学、量子力学、量子电子学、电磁学、滤波器设计、数值方法、扬声器设计等22门课程。有著作6本，国际期刊上发表的学术论文30余篇，会议论文50余篇。 P.-T. Ho is a visiting professor in Tsinghua University, on leave from the University of Maryland, College Park, USA. He specializes in optics. His technical accomplishments include the first mode-locking of the semiconductor laser, the first mode-locking and amplification of the CW Nd:glass laser, the discovery of several transient switching phenomena in optical bistability, the first optically addressed spatial light modulator at 1.5 m, the extension of the Schawlow-Townes formula to the mode-locked laser and its experimental verification, the quantum theory of gyrotrons and of free electron lasers, the quantum Child-Langmuir law, reconfigurable antennas, and high power diamond and ZnS switches. In recent years he has been working on optical micro-ring resonators, being the first to demonstrate multi-ring and many other linear and nonlinear devices. Mr. Ho was born in Guangzhou, grew up in Hong Kong, and studied at MIT where he received all his degrees. After a post-doctoral appointment at the Imperial College, London, he worked as a research scientist at the University of Southern California, whence he moved to the University of Maryland, where he is now a professor of electrical engineering. InMaryland, he has taught over 20 different courses in circuits, electronics, numerical methods, systems and signals, electromagnetics, optics, semiconductors, quantum mechanics, quantum electronics, filter design, group theory, acoustics and loudspeaker design. |
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