Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Enhancement of evanescent fluorescence from fiber-optic sensors by thin-film sol-gel coatings

Not Accessible

Your library or personal account may give you access

Abstract

A theoretical analysis and an experimental demonstration are presented to show the increase in collected evanescent fluorescence for a fiber-optic sensor having a high refractive-index (nr), titanium sol-gel, thin-film coating. Simulations indicated that the maximum collected fluorescence should increase and shift to smaller film thicknesses as nr increases and also predicted an interference color-filtering effect. Experimentally, collected fluorescence increased by as much as 6× over that from a bare fused-silica fiber having a numerical aperture of 0.60. Simulations and experimental data were consistent with a decrease in the effective nr as film thickness increases. Electron micrographs of the sol-gel structure supported this observation and showed that the structure differs significantly from that of films formed on a planar glass substrate. High nr, sol-gel thin films are a potentially inexpensive approach to significantly increasing the signal from fiber sensors.

© 1998 Optical Society of America

Full Article  |  PDF Article
More Like This
Rapid and sensitive detection of ammonia in water by a long period fiber grating sensor coated with sol-gel silica

Wenbo Gan, Yaowei Li, Ting Liu, Yitao Yang, Baoan Song, Shixun Dai, Tiefeng Xu, Yin Wang, Ting-Jung Lin, and Peiqing Zhang
Opt. Express 30(19) 33817-33825 (2022)

Demonstration of a high-temperature fiber-optic gas sensor made with a sol-gel process to incorporate a fluorescent indicator

Jeffrey T. Remillard, Jeffrey R. Jones, Ben D. Poindexter, Chaitanya K. Narula, and Willes H. Weber
Appl. Opt. 38(25) 5306-5309 (1999)

High sensitivity sol-gel silica coated optical fiber sensor for detection of ammonia in water

Dejun Liu, Wei Han, Arun Kumar Mallik, Jinhui Yuan, Chongxiu Yu, Gerald Farrell, Yuliya Semenova, and Qiang Wu
Opt. Express 24(21) 24179-24187 (2016)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (13)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved