Optical Sensors

Optimization of layer-by-layer electrostatic self-assembly processing parameters for optical biosensing

[+] Author Affiliations
Helen Shibru

Virginia Polytechnic Institute and State University, Bradley Department of Electrical Engineering, Center for Photonics Technology, 460 Turner Street, Suite 303, Blacksburg, Virginia 24061

Yan Zhang

Virginia Polytechnic Institute and State University, Bradley Department of Electrical Engineering, Center for Photonics Technology, 460 Turner Street, Suite 303, Blacksburg, Virginia 24061

Kristie L. Cooper

Virginia Polytechnic Institute and State University, Bradley Department of Electrical Engineering, Center for Photonics Technology, 460 Turner Street, Suite 303, Blacksburg, Virginia 24061

Gary R. Pickrell

Virginia Polytechnic Institute and State University, Department of Materials Science and Engineering, 304 Holden Hall, Blacksburg, Virginia 24061

Anbo Wang

Virginia Polytechnic Institute and State University, Bradley Department of Electrical Engineering, Center for Photonics Technology, 460 Turner Street, Suite 303, Blacksburg, Virginia 24061

Opt. Eng. 45(2), 024401 (February 07, 2006). doi:10.1117/1.2167090
History: Received January 07, 2005; Revised June 15, 2005; Accepted June 17, 2005; Published February 07, 2006
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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.

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© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

Helen Shibru ; Yan Zhang ; Kristie L. Cooper ; Gary R. Pickrell and Anbo Wang
"Optimization of layer-by-layer electrostatic self-assembly processing parameters for optical biosensing", Opt. Eng. 45(2), 024401 (February 07, 2006). ; http://dx.doi.org/10.1117/1.2167090


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