摘要
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 （10^5） modes can be kept for a long period in a general laboratory circumstance.
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 （10^5） modes can be kept for a long period in a general laboratory circumstance.
基金
This work was supported by the National Fundamental Research Program of China (No.2006CB921900)
the Knowledge Innovation Project of Chinese Academy of Sciences,and the National Natural Science Foundation of China (No.60537020 and 60121503)
Y.Xiao is also supported by the China Postdoctoral Science Foundation.
