Abstract
We fabricate fiber Bragg grating (FBG) in microfibers (MFs) using focused ion beam milling technique. By periodically etching -depth grooves on the surface of silica MFs with diameters less than , evident grating features with transmission dip up to are obtained. Because of the high-index contrast of the gratings structure, the length of the microfiber Bragg grating (MFBG) can be reduced to level. Using a -length -diameter MFBG, we also demonstrate sensitivity up to 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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