Journal
OPTICS LETTERS
Volume 36, Issue 16, Pages 3115-3117Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.003115
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Funding
- National Basic Research Program of China [2007CB307003]
- National Natural Science Foundation of China (NSFC) [10974178, 61 036 012]
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We fabricate fiber Bragg grating (FBG) in microfibers (MFs) using focused ion beam milling technique. By periodically etching 100 nm-depth grooves on the surface of silica MFs with diameters less than 2 mu m, evident grating features with transmission dip up to 15 dB are obtained. Because of the high-index contrast of the gratings structure, the length of the microfiber Bragg grating (MFBG) can be reduced to 500 mu m level. Using a 518 mu m-length 1.8 mu m-diameter MFBG, we also demonstrate sensitivity up to 660 nm 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. (C) 2011 Optical Society of America
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