Novel metal coated long period fiber grating liquid sensor based on dual-peak resonance

Zhengtian Gu; Yanjun Shi; Jiangtao Zhang

doi:10.1117/1.OE.51.8.081508

16 May 2012 Novel metal coated long period fiber grating liquid sensor based on dual-peak resonance

Zhengtian Gu, Yanjun Shi, Jiangtao Zhang

Author Affiliations +

Funded by: National Natural Science Foundation of China, National Science Foundation of China, Scientific Research Key Project of the Ministry of Education, Research Project, Research Innovation Key Project of Education Committee of Shanghai, Innovation Project of Shanghai Municipal Education Committee, Shanghai Leading Academic Discipline Project, Shanghai Leading Academic Discipline, Education Committee of Shanghai, and Shanghai Leading Academic Discipline Project, Shanghai Key Subject Construction, Leading Academic Discipline Project of Shanghai Municipal Government, Key Discipline Construction Program of Shanghai

Optical Engineering, Vol. 51, Issue 8, 081508 (May 2012). https://doi.org/10.1117/1.OE.51.8.081508

Abstract

A novel metal coated long period fiber grating (LPFG) liquid sensor is presented, in which the dual-peak resonance (DPR) combined with the surface plasma resonance is utilized to improve the sensitivity to liquid concentration. Based on the coupled-mode theory, the double-clad structural model is used to analyze the dual-peak resonant characteristics and refractive index sensing properties of this LPFG. The results show that dual resonant peaks are far away from each other, and shift in opposite directions with an increase of surrounding refractive index. In addition, the influence of metal film thickness and grating structural parameters (grating period Λ, average index change σ) on the sensitivity to refractive index is discussed for this LPFG sensor, which provides a foundation for designing high sensitivity liquid LPFG sensors. Experimentally, the silver films were coated on a LPFG by direct current sputtering, and the dual resonant peaks were observed in this LPFG. Then the salt solution concentration monitoring test was performed. The results indicate the metal coated LPFG based on DPR has higher refractive index sensitivity as compared with dual-peak based non-coated LPFG and general single peak based LPFG, the resolution of liquid refractive index is available to 10−5 for the proposed LPFG with suitable film and grating parameters.

Citation Download Citation

Zhengtian Gu, Yanjun Shi, and Jiangtao Zhang "Novel metal coated long period fiber grating liquid sensor based on dual-peak resonance," Optical Engineering 51(8), 081508 (16 May 2012). https://doi.org/10.1117/1.OE.51.8.081508

Published: 16 May 2012

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE