Compact microfiber Bragg gratings with high-index contrast
Compact microfiber Bragg gratings with high-index contrast
复制标题
具有高折射率对比度的紧凑型微纤维布拉格光栅
DOI：
10.1364/ol.36.003115
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发表时间：
2011-08-15
期刊：
影响因子：
3.6
通讯作者：
Tong, Limin
中科院分区：
文献类型：
--
作者：
Liu, Yanxin;Meng, Chao;Tong, Limin
利用聚焦离子束球磨技术在微细光纤中制作了光纤布拉格光栅。通过在直径小于2微米的二氧化硅多层光纤表面周期性刻蚀100 nm深的凹槽，获得了透过率下降达15d B的明显的光栅特征。由于该结构的高折射率对比度，微光纤布拉格光栅(MFBG)的长度可以减小到500微米级。使用长518微米、直径1.8微米的MFBG，我们还展示了每个折射率单位(RIU)对折射率(RI)传感的灵敏度高达660 nm。这里展示的高度紧凑的MFBG可以作为微型化光子组件和设备的低维构建块。(C)2011年美国光学学会
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