Chinese Optics Letters, 2007, 5 (11): 668, Published Online: Nov. 14, 2007
Fiber taper coupled high-quality-factor planar microdisk Download: 1065次
微盘腔 高Q 临界耦合 光纤锥 120.4640 Optical instruments 230.0230 Optical devices 230.3990 Micro-optical devices
Abstract
A fiber taper can evanescently couple to whispering gallery modes (WGMs) in a planar silica microdisk for observing the optical properties of the microdisk cavity. It is revealed that WGMs have very high quality (Q) factors by controlling the air gap between the taper and the microdisk. The best coupling efficiency from the taper to the microdisk is as high as 98%, and can be continuously adjusted from the under-coupling, critical-coupling to over-coupling regimes. The influence of the laboratory circumstance such as surface contamination on the microdisk is also discussed. It is experimentally shown that the high-Q-factor (100000) modes can be kept for a long period in a general laboratory circumstance.
Xiaowei Wu, Yunfeng Xiao, Yong Yang, Chunhua Dong, Zhengfu Han, Guangcan Guo. Fiber taper coupled high-quality-factor planar microdisk[J]. Chinese Optics Letters, 2007, 5(11): 668.