Thermal boundary resistance between GaN and cubic ice and THz acoustic attenuation spectrum of cubic ice from complex acoustic impedance measurements

Pierre Adrien Mante, Chien Cheng Chen, Yu Chieh Wen, Jinn Kong Sheu, Chi Kuang Sun

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A phonon nanoscopy method, based on the picosecond ultrasonics technique, capable of studying the complex acoustic reflection coefficient at frequency up to 1 THz is proposed and demonstrated. By measuring the reflection coefficient at the same surface location at the interface between GaN and air, and between GaN and the material to characterize, we get access to the THz amplitude and phase spectra of the acoustic phonon reflection. The retrieval of both these pieces of information then allows the calculation of the attenuation in a wide range of frequency and gives new insight into the Kapitza anomaly. This method is then applied to cubic ice, and the measurements of the elastic properties, the phonon anharmonic decay spectrum up to 1 THz, as well as the measurements of the thermal phonon lifetime at 150 K are all achieved.

Original languageEnglish
Article number225901
JournalPhysical review letters
Volume111
Issue number22
DOIs
Publication statusPublished - 2013 Nov 25

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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