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Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

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Published on: July 26, 2016

Photoacoustic technique for determining optical absorption coefficients in solids.

A Hordvik, H Schlossberg

|February 20, 2010

Summary

This summary is machine-generated.

This study explores a photoacoustic technique for measuring optical absorption in solids. The method uses laser pulses and a piezoelectric transducer, achieving high sensitivity for precise material characterization.

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Area of Science:

Materials Science
Optics
Acoustics

Background:

Accurate measurement of optical absorption coefficients is crucial for understanding material properties.
Existing techniques may have limitations in sensitivity or applicability to various solid materials.

Purpose of the Study:

To investigate and validate a photoacoustic technique for determining the optical absorption coefficient in solid samples.
To assess the sensitivity and practical limitations of this photoacoustic method.

Main Methods:

Utilized a photoacoustic approach involving a train of laser pulses transmitted through solid samples.
Employed a piezoelectric transducer attached to the sample to detect elastic waves generated by absorbed laser energy.
Performed calibration using a wavelength with a known absorption coefficient.

Main Results:

The photoacoustic technique demonstrated sensitivity capable of measuring absorption coefficients down to the 10(-6) cm(-1) range.
Scattered radiation onto the transducer limited the sensitivity in the tested samples to approximately 1 x 10(-5) cm(-1).
Effective measurements were achievable with approximately 1 W of laser power.

Conclusions:

The photoacoustic technique is a viable and sensitive method for quantifying optical absorption in solids.
Further optimization could potentially overcome scattering limitations for even greater sensitivity.
This technique offers a valuable tool for materials characterization and optical property analysis.