Optical imaging using second harmonic generation of acoustic surface waves

A simple new method is described for probing acoustoelectric domains in n-GaAs through their strong photoconductive response to a focused light beam. This permits a scan of the spatial distribution and propagation of the amplified acoustic flux in the sample. As a further application of the photoconductive response, a narrow propagating domain can be used to reveal an optical image projected onto the sample. The techniques are illustrated here primarily for extrinsic photoexcitation with Nd:YAG laser light.

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Zinc oxide–silicon monolithic acoustic surface wave optical image scanner

Elliott

Gunshor

Pierret

et al. 1975

Applied Physics Letters

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An optical image is converted into an electrical signal by utilizing acoustic surface wave convolution in a monolithic structure composed of a piezoelectric zinc oxide film on a silicon substrate. Measurements are presented describing the variation of convolution efficiency with light intensity, input acoustic power, and convolver gate electrode dc bias. An initialization procedure is described that allows the device to operate either in an image memory mode or in a nonstorage mode which permits scanning of nonstationary images.

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Optical imaging using second harmonic generation of acoustic surface waves

Abstract: Conversion of an optical image into an electrical signal is obtained by means of a harmonic generation process. The device consists of a high-resistivity silicon semiconductor coupled to acoustic surface waves propagating on a YZ lithium niobate substrate.

Cited by 3 publications

References 4 publications

The interaction between semiconductors and acoustic surface waves—A review

The interaction between semiconductors and acoustic surface waves—A review

Photoconductive probing of acoustoelectric domains with application to optical image scanning

Zinc oxide–silicon monolithic acoustic surface wave optical image scanner

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