High sensitivity evanescent field fiber Bragg grating sensor

Author

Chryssis, Athanasios N. ; Lee, Sang M. ; Lee, Sang B. ; Saini, Simarjeet S. ; Dagenais, Mario

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Maryland, College Park, MD, USA

Volume

17

Issue

6

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

1253

Lastpage

1255

Abstract

Increased sensitivity to change in surrounding index is shown by etching the core of a fiber Bragg grating. A maximum sensitivity of 1394 nm/riu is achieved as the surrounding index approaches the core index. Assuming a detectable spectral resolution of 0.01 nm realized in the experiment, the sensor achieves a minimum detectable index resolution of 7.2×10^-6 when the index of the surrounding medium is 1.44. The sensor can be used as a chemical and biosensor and multiple sensors can be multiplexed and interrogated along a single fiber.

Keywords

Bragg gratings; etching; fibre optic sensors; refractive index measurement; biosensor; chemical sensor; core index; etching; evanescent field fiber Bragg grating sensor; index resolution; spectral resolution; Biosensors; Bragg gratings; Chemical and biological sensors; Chemical sensors; Etching; Fiber gratings; Optical fiber sensors; Optical fiber theory; Protection; Wavelength measurement; Biological sensor; chemical sensor; evanescent field; fiber Bragg grating (FBG);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2005.846953

Filename

1432793