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High-sensitivity surface-photoacoustic spectroscopy

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Abstract

The sensitivity of surface-acoustic-wave detection is extended by several orders of magnitude to a surface-specific absorbance of αl ∼ 10−9 for a power density of 1 GW/cm2 using a narrow-bandwidth interdigitated surface-acoustic-wave detector and an optical irradiation pattern to provide a matched acoustic signal. Major advantages include narrow-bandwidth detection and a large irradiated area that permits more optical energy on the sample. A rapid, nondestructive, reproducible liquid-bonding technique, which permits the extension of these measurements to a wide variety of samples, is demonstrated. Results for AlN and ZrO2 films (αl ∼ 10−4) and fused-silica substrates (αl ∼ 10−6–10−7) are reported.

© 1990 Optical Society of America

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