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Proceedings Paper

Characterization of sensing layer onto the tip tapered fiber
Author(s): M. Pospisilova; J. Petrasek; V. Matejec; I. Kasik
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Paper Abstract

In this paper we present a novel method for the measurement of the thickness of the sensing layer applied on the tip of an optical fiber and fiber tapers. The method is based on analysis of distributions of the fluorescence intensity over this layer. In experiments the fluorescence of the sensing layer prepared by the sol-gel method was investigated be means of a confocal microscope Zeiss LS5 Duo. The fluorescence was excited at 477 nm by an Ar laser and detected in a spectral range from 518 to 600 nm. The fluorescence distribution was determined by scanning the layer in the direction of the taper axis (z-direction) with a step of 500 nm in an overall length of 42 μm and 26 μm. The layer thickness was estimated from the measured distribution of fluorescence intensity. Assumptions of method are that close to the layer boundary the fluorescence intensity decreases with z2, the concentration of fluorescence centers in the layer is homogenous and attenuation of excitation wavelength in the sensing layer is neglected. This method has made possible to investigate sensing layers with thicknesses of about 1 μm.

Paper Details

Date Published: 18 May 2009
PDF: 7 pages
Proc. SPIE 7356, Optical Sensors 2009, 735624 (18 May 2009); doi: 10.1117/12.820973
Show Author Affiliations
M. Pospisilova, Institute of Photonics and Electronics (Czech Republic)
J. Petrasek, Institute of Experimental Botany (Czech Republic)
V. Matejec, Institute of Photonics and Electronics (Czech Republic)
I. Kasik, Institute of Photonics and Electronics (Czech Republic)

Published in SPIE Proceedings Vol. 7356:
Optical Sensors 2009
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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