Abstract
A whispering gallery mode microsphere resonator is proposed and demonstrated. The device is based on dual microspheres embedded in an expanded hollow sphere cavity formed by splicing a single-mode fiber and a capillary tube. The whispering gallery mode resonance is excited by the light traveling along the hollow sphere cavity wall and directed out by use of a tapered optical fiber in closing contact with one of the microspheres. The device has a good quality factor (Q) of 2.072 × 103, and a number of asymmetric Fano resonance lines. It is compact in structure, low in cost, simple in fabrication, and convenient in operation.
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