Detection of external refractive index change with high sensitivity using long-period gratings in photonic crystal fiber

被引：46

作者：

Zhu, Yinian ^{[1
]}

He, Zonghu ^{[1
]}

Du, Henry ^{[1
]}

机构：

[1] Stevens Inst Technol, Dept Chem Biomed & Mat Eng, Hoboken, NJ 07030 USA

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2008年 / 131卷 / 01期

基金：

美国国家科学基金会;

关键词：

long-period gratings; optical fiber sensors; photonic crystal fiber; refractometry;

D O I：

10.1016/j.snb.2007.11.040

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We report that the proposed long-period gratings (LPGs), which were fabricated in an endlessly single-mode photonic crystal fiber (ESM-PCF) via point-by-point residual stress relaxation utilizing focused CO2 laser irradiation, exhibit a high sensitivity to variations in the external refractive index, with an identified shifting of attenuation band as large as 4.4 pm for 1 x 10(-5) change in the surrounding refractive index over the range from 1.42 to 1.45. Contrary to LPGs inscribed in conventional all-solid optical fiber under similar condition, the mode-coupling resonance band of the ESM-PCF-LPG moves towards longer wavelength with increasing refractive index in the surrounding medium of the fiber cladding. The resonance wavelength has a low-temperature coefficient of 2.2 pm/degrees C over 30 - 200 degrees C. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：265 / 269

页数：5

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