Indium tin oxide overlayered waveguides for sensor applications

Luff, B.Jonathan, Wilkinson, James S. and Perrone, Guido (1997) Indium tin oxide overlayered waveguides for sensor applications. Applied Optics, 36, (27), 7066-7072. (doi:10.1364/AO.36.007066).


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The use of indium tin oxide (ITO) thin films as electrodes for integrated optical electrochemical sensor devices is discussed. The effect of various thicknesses of ITO overlayers exhibiting low resistivity and high transparency on potassium ion-exchanged waveguides fabricated in glass substrates is investigated over the wavelength range 500-900 nm. ITO overlayers are formed by reactive thermal evaporation in oxygen, followed by annealing in air to a maximum temperature of 320°C. With air as superstrate, losses in the waveguides were found to increase dramatically above 30nm ITO thickness for TE polarization, and above 50nm thickness for TM. Losses were increased over the whole wavelength range for a superstrate index close to that of water. A one-dimensional multilayer waveguide model is used in the interpretation of the experimental results.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1364/AO.36.007066
Additional Information:
ISSNs: 1559-128X
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions : University Structure - Pre August 2011 > Optoelectronics Research Centre
ePrint ID: 78066
Accepted Date and Publication Date:
Date Deposited: 11 Mar 2010
Last Modified: 31 Mar 2016 13:12

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