Doped sol-gel materials as a matrix for fast-response photochromic devices and as a pororus cladding for fiber optic chemical sensors

James J. Flores; Eric L. Chronister

doi:10.1117/12.232140

9 February 1996 Doped sol-gel materials as a matrix for fast-response photochromic devices and as a pororus cladding for fiber optic chemical sensors

James J. Flores, Eric L. Chronister

Author Affiliations +

Proceedings Volume 2716, Smart Structures and Materials 1996: Smart Materials Technologies and Biomimetics; (1996) https://doi.org/10.1117/12.232140
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

Abstract

The effect of a porous sol-gel matrix on the optical limiting characteristics of chloroaluminum phthalocyanine (CAP) has been investigated. Excited state singlet-singlet absorption processes are found to be responsible for the fast response characteristics (ps to ns) for CAP doped xerogel glasses. Subsequent inter-system crossing and triplet-triplet absorption processes are responsible for the persistent absorbance (ns to ms) determined by the ISC rate and the phosphorescent lifetime of CAP. Inhomogeneous spectral broadening of CAP in the xerogel matrix relative to alcohol solutions was found to have a significant affect on the relative linear (i.e. ground state) versus non-linear (i.e. optically induced excited state) absorption processes. In addition, the faster absorption recovery observed for CAP in a silica xerogel relative to ethanol solution was attributed to an increased rate of electronic to vibrational internal conversion in the xerogel matrix. Porous xerogel glasses doped with sensor chromophores have also been in investigated as a novel cladding for fiber optic chemical sensor devices. The lower refractive index of the sol-gel film makes it a suitable cladding material while the porous channels allow analytes to diffuse into the evanescent field region where they are detected by changes in the photophysics of analyte sensitive chromophores.

Citation Download Citation

James J. Flores and Eric L. Chronister "Doped sol-gel materials as a matrix for fast-response photochromic devices and as a pororus cladding for fiber optic chemical sensors", Proc. SPIE 2716, Smart Structures and Materials 1996: Smart Materials Technologies and Biomimetics, (9 February 1996); https://doi.org/10.1117/12.232140

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

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
11 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Bioalcohols

Optical limiting

Absorbance

Absorption

Glasses

Sol-gels

Cladding

Show All Keywords

Keywords/Phrases

Search In:

Publication Years