Dr. Qing Gu
Ultrafast and Nanoscale Optics Group
Electrical and Computer Engineering, University of California at San Diego
时间：9月5日（周五）下午4:00
地点：唐仲英楼A213
内容简介:
Metal-clad nanolasers have recently become excellent candidates for light sources in densely-packed chip-scale photonic circuits, due to their electromagnetic isolation from surrounding components, improved emission efficiency and enhanced cavity-emitter interactions. In this talk, I will discuss the theory, design, fabrication, and characterization of semiconductor metal-clad nanolasers. To accurately evaluate the quantum effects in nanoscale devices, such as the modification of spontaneous emission rate in a cavity, I will describe a formal treatment of the Purcell effect – the modification of the spontaneous emission rate by a sub-wavelength cavity, using the emitter-field-reservoir model of non-relativistic quantum electrodynamics. Lastly, I will outline an integrated treatment of multiple design aspects beyond pure electromagnetic consideration, focusing on the temperature effects in nanolasers. We consider the interplay of various temperature-dependent parameters, and study their effects on optical mode, emission characteristics as well as thermal performance.