Ultrasensitive liquid refractometer based on a Mach-Zehnder micro-cavity in optical fibre fabricated by femtosecond laser-induced water breakdown
Ultrasensitive liquid refractometer based on a Mach-Zehnder micro-cavity in optical fibre fabricated by femtosecond laser-induced water breakdown
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DOI：
10.1080/09500340.2016.1198500
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发表时间：
2016-07
影响因子：
1.3
通讯作者：
Yi Liu;Min Li;Huihui Sun;Yan Li;S. Qu
中科院分区：
文献类型：
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作者：
Yi Liu;Min Li;Huihui Sun;Yan Li;S. Qu
摘要利用飞秒激光诱导水击穿技术在单模光纤中制备了具有两个对称开口的马赫-曾德尔（MZ）微腔。微腔的开口尺寸为10 μm × 100 μm。微腔和光纤芯的剩余一半构成马赫-曾德尔干涉仪（MZI）的两个臂。由于微腔形状规则，内表面光滑，在水中的微腔干涉仪显示出理想的干涉光谱。插入损耗仅为-8dB，一个MZI峰值的对比度达到40 dB以上。由于具有高的折射率灵敏度（14296.98 nm/RIU）、高的折射率分辨率（1 × 10−5 RIU）、良好的线性度（99.62%）和低的温度串扰（0.04 nm/°C），该器件可用作超灵敏液体折射计。
Abstract A Mach–Zehnder (MZ) micro-cavity with two symmetric openings in single mode fibre (SMF) was fabricated by femtosecond laser-induced water breakdown. The micro-cavity is rightly across half of the fibre core, and the opening size of the micro-cavity is 10 μm × 100 μm. The micro-cavity and the remaining half of the fibre core constitute two arms of the Mach–Zehnder interferometer (MZI). The MZI with micro-cavity immerged in water shows perfect interference spectrum due to the regular shape and smooth internal surface of the micro-cavity. The insertion loss is only –8 dB and the contrast of one MZI peak reaches more than 40 dB. The MZI with micro-cavity in SMF can be used as an ultrasensitive liquid refractometer as its ultrahigh refractive index (RI) sensitivity (14296.98 nm/RIU), high RI resolution (1 × 10−5 RIU), good linearity (99.62%) and low temperature crosstalk (0.04 nm/°C).