Abstract

We present an integrated in-fiber coupler for excitation of whispering-gallery modes of a microsphere resonator. The coupler is simply fabricated by chemical etching away the holey area of a photonic crystal fiber, leaving a freestanding solid core enclosed in a silica housing. Light is coupled into a microsphere through the suspended core with a diameter of 2.1 μm. Since the coupler itself performs as a Fabry–Perot interferometer, asymmetric Fano resonances can be observed in the mixed reflection spectrum. The silica housing of the coupler provides a robust mechanical support to the microsphere resonator. The new Fano resonance coupler shows great potential in biochemical sensing and optical switching applications.

© 2015 Optical Society of America

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