Microfiber-probe-based ultrasmall interferometric sensor

被引：70

作者：

Kou, Jun-long

Feng, Jing

Wang, Qian-jin

Xu, Fei ^{[1
]}

Lu, Yan-qing

机构：

[1] Nanjing Univ, Coll Engn & Appl Sci, Nanjing 210093, Peoples R China

来源：

OPTICS LETTERS | 2010年 / 35卷 / 13期

基金：

美国国家科学基金会;

关键词：

FABRY-PEROT-INTERFEROMETER; REFRACTIVE-INDEX; FEMTOSECOND LASER; FIBERS; TEMPERATURE;

D O I：

10.1364/OL.35.002308

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report an ultrasmall microfiber-probe-based reflective interferometer for highly sensitive liquid refractive index measurement. It has a 3: 5 mu m micronotch cavity fabricated by focused ion beam micromachining. A sensitivity of 110 nm/RIU (refractive index unit) in liquid is achieved with over 20 dB extinction ratio. Theoretical analysis shows this kind of device is a hybrid of Fabry-Perot and modal interferometers. In comparison with normal fiber interferometers, this probe sensor is very compact, stable, and cheap, offering great potentials for detecting inside sub-wavelength bubbles, droplets, or biocells. (C) 2010 Optical Society of America

引用

页码：2308 / 2310

页数：3

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