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Thin Film Thermochromic Materials for Non-Linear Optical Devices.

Published online by Cambridge University Press:  15 February 2011

Keith L Lewis
Affiliation:
Defence Research Agency St Andrews Road, Malvern Worcs WR14 3PS, UK
A M Pitt
Affiliation:
Defence Research Agency St Andrews Road, Malvern Worcs WR14 3PS, UK
T Wyatt-Davies
Affiliation:
Defence Research Agency St Andrews Road, Malvern Worcs WR14 3PS, UK
J R Milward
Affiliation:
Defence Research Agency St Andrews Road, Malvern Worcs WR14 3PS, UK
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Abstract

A number of materials are available which exhibit thermochromic properties. These include the superionic materials (eg silver sulphide), phase transition materials (eg vanadium dioxide) and mixed valence materials (eg SmS). Such materials can be exploited as optical thin films and when incorporated into multilayer structures exhibit non-linear properties, particularly at wavelengths in the infra-red (1–12μm). The response of such devices is dependant on the degree of temperature rise produced in the active material, which in turn is dependant on the optical properties of the material and the heat sinking characteristics of the substrate. A summary is presented highlighting techniques for film deposition, multilayer device design and temporal response characteristics measured under conditions of pulsed irradiation.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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