RESEARCH PAPERS: Heat Conduction in Thin Films

Thermally Induced Optical Nonlinearity During Transient Heating of Thin Films

[+] Author and Article Information
G. Chen

Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708

C. L. Tien

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Heat Transfer 116(2), 311-316 (May 01, 1994) (6 pages) doi:10.1115/1.2911401 History: Received January 01, 1993; Revised June 01, 1993; Online May 23, 2008


This work studies the temperature field and the optical response of weakly absorbing thin films with thermally induced optical nonlinearity during picosecond to nanosecond pulsed-laser heating. A one-dimensional model is presented that examines the effects of the temperature dependent optical constants and the nonuniform absorption caused by interference. The energy equation is solved numerically, coupled with the matrix method in optical multilayer theory. Both cadmium sulfide (CdS) thin films and a zinc selenide (ZnSe) interference filter are considered. The computational results compare favorably with available experimental data on the ZnSe interference filter. This study shows that the transient temperature distributions in the films are highly nonuniform. Such nonuniformity yields Airy’s formulae for calculating the thin-film reflectance and transmittance inapplicable. Applications of the work include optical bistability, localized change of the film structure, and measurement of the thermal diffusivity of thin films.

Copyright © 1994 by The American Society of Mechanical Engineers
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