Demonstration of critical coupling in microfiber loops wrapped around a copper rod

Applied Physics Letters - Tập 91 Số 7 - 2007
Xin Guo1, Yuhang Li1, Xiaoshun Jiang1, Limin Tong1
1Zhejiang University, State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Hangzhou 310027, China

Tóm tắt

The authors demonstrate critical coupling condition in microfiber loops wrapped around a copper rod. The critical coupling condition is achieved by tuning the coupling coefficient to balance the circulation loss. A maximum extinction of 30dB has been obtained around the critical coupling point with a quality factor of about 4000. The resonance wavelength can be tuned by applying an electric current through the copper rod. The copper rod, usually deemed as a high-loss medium for handling light at optical frequency, serves as a low-index robust support for achieving critical coupling in the microfiber loops with acceptable loss.

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Applied Physics Letters

Tập 91 Số 7

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