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Optical Engineering

Optimization of layer-by-layer electrostatic self-assembly processing parameters for optical biosensing
Author(s): Helen Shibru; Yan Zhang; Kristie L. Cooper; Gary R. Pickrell; Anbo Wang
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Paper Abstract

The effect of layer-by-layer electrostatic self-assembly processing parameters on resulting thin-film characteristics was determined in order to optimize the thin-film structure for optical biosensing. The use of long-period fiber gratings (LPFGs) requires careful control of the refractive index of the surrounding medium, which can be achieved by tuning the refractive index and thickness of an optical thin film deposited directly on the optical fiber surface. The high-sensitivity LPFG refractometry range falls in a window just below the effective index of the relevant cladding mode. We investigated five factors at two levels using variable-angle spectroscopic ellipsometry and analysis of variance. Salt concentration and pH were found to be critical parameters for refractive index control.

Paper Details

Date Published: 1 February 2006
PDF: 6 pages
Opt. Eng. 45(2) 024401 doi: 10.1117/1.2167090
Published in: Optical Engineering Volume 45, Issue 2
Show Author Affiliations
Helen Shibru, Virginia Polytechnic Institute and State Univ. (United States)
Yan Zhang, Virginia Polytechnic Institute and State Univ. (United States)
Kristie L. Cooper, Virginia Polytechnic Institute and State Univ. (United States)
Gary R. Pickrell, Virginia Polytechnic Institute and State Univ. (United States)
Anbo Wang, Virginia Polytechnic Institute and State Univ. (United States)


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