How calculate thermal diffusion length of thin films from photoacoustic spectroscopy of amplitude signal?

01 January 1970 1 5K Report

Shaik Rasool

Photovotaic laboratory

The thermal diffusion length is defined as TDL=(D/pi f)^1/2, where D is thermal diffusivity and f is the modulation frequency, so that you can determine TDL for different frequencies if D is well-known. You can determine D from the experimental curve of photoacouctic (PA) signal amplitude as a function of f (or using the PA phase versus f curve). There are several methods for measuring D.

I recommend to read the following references:

Rosencwaig, A. and Gersho, A. 1976, J. of Appl. Phys., 47, 64.

Vargas, H. and Miranda, L. C. M. 1988 Phys. Rep. 161, 43.

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