Specular Scattering Probability of Acoustic Phonons in Atomically Flat Interfaces

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Abstract

We report a direct determination of the specular scattering probability of acoustic phonons at a crystal boundary by observing the escape of incident coherent phonons from the coherent state during reflection. In the sub-THz frequency range where the phonon wavelength is much longer than the lattice constant, the acoustic phonon-interface interaction is found to agree well with the macroscopic theory on wave scattering from rough surfaces. This examination thus quantitatively verifies the dominant role of atomic-scale corrugations in the Kapitza anomaly observed at 1-10 K and further opens a new path to nondestructively estimate subnanoscale roughness of buried interfaces.

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Most cited references 13

Record: found
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Article: not found

Thermal boundary resistance

E. T. Swartz, R. Pohl (1989)

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Record: found
Abstract: not found
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Nondestructive evaluation of micrometric diamond films with an interferometric picosecond ultrasonics technique

C Rossignol, B. Perrin, S Laborde … (2004)

0 comments Cited 23 times – based on 0 reviews      Review now

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Record: found
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Spatial manipulation of nanoacoustic waves with nanoscale spot sizes.

Chi-Chin Sun, ZE-QUN SUN, Jen-Inn Chyi … (2007)

Coherent acoustic phonons are generated at terahertz frequencies when semiconductor quantum-well nanostructures are illuminated by femtosecond laser pulses. These phonons-also known as nanoacoustic waves-typically have wavelengths of tens of nanometres, which could prove useful in applications such as non-invasive ultrasonic imaging and sound amplification by the stimulated emission of radiation. However, optical diffraction effects mean that the nanoacoustic waves are produced with spot sizes on the micrometre scale. Near-field optical techniques can produce waves with smaller spot sizes, but they only work near surfaces. Here, we show that a far-field optical technique--which suffers no such restrictions--can be used to spatially manipulate the phonon generation process so that nanoacoustic waves are emitted with lateral dimensions that are much smaller than the laser wavelength. We demonstrate that nanoacoustic waves with wavelengths and spot sizes of the order of 10 nm and 100 nm, respectively, can be generated and detected.