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Nanoporous leaky waveguide based chemical and biological sensors with broadband spectroscopy

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3 Author(s)
Qi, Zhi-Mei ; PRESTO, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan and Energy Technology Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8565, Japan ; Honma, Itaru ; Zhou, Haoshen

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2424643 

Here the authors demonstrate spectral optical chemical and biological sensors based on a nanoporous thin-film leaky waveguide that were fabricated by dip coating the gold-layer-covered glass substrate from the colloidal TiO2 solution. The sensor operates by interrogating the resonance wavelengths for the leaky modes in a broad bandwidth using the Kretschmann configuration. Sensitivities of the sensor to refractive index of liquid and protein adsorption were investigated and compared with the spectral surface plasmon resonance sensors. The best fitting to the experimental data was carried out with the Fresnel equations, and thickness and porosity of the nanoporous waveguiding layer were determined.

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 1 )

Date of Publication:

Jan 2007

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