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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