Abstract

We fabricate fiber Bragg grating (FBG) in microfibers (MFs) using focused ion beam milling technique. By periodically etching 100nm-depth grooves on the surface of silica MFs with diameters less than 2μm, evident grating features with transmission dip up to 15dB are obtained. Because of the high-index contrast of the gratings structure, the length of the microfiber Bragg grating (MFBG) can be reduced to 500μm level. Using a 518μm-length 1.8μm-diameter MFBG, we also demonstrate sensitivity up to 660nm per refractive index unit (RIU) for refractive index (RI) sensing. The highly compact MFBGs demonstrated here may serve as low-dimensional building blocks for miniaturized photonic components and devices.

© 2011 Optical Society of America

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