THz Acoustic Spectroscopy by using Double Quantum Wells and Ultrafast Optical Spectroscopy

Fan Jun Wei, Yu Hsiang Yeh, Jinn Kong Sheu, Kung Hsuan Lin

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

GaN is a pivotal material for acoustic transducers and acoustic spectroscopy in the THz regime, but its THz phonon properties have not been experimentally and comprehensively studied. In this report, we demonstrate how to use double quantum wells as a THz acoustic transducer for measuring generated acoustic phonons and deriving a broadband acoustic spectrum with continuous frequencies. We experimentally investigated the sub-THz frequency dependence of acoustic attenuation (i.e., phonon mean-free paths) in GaN, in addition to its physical origins such as anharmonic scattering, defect scattering, and boundary scattering. A new upper limit of attenuation caused by anharmonic scattering, which is lower than previously reported values, was obtained. Our results should be noteworthy for THz acoustic spectroscopy and for gaining a fundamental understanding of heat conduction.

Original languageEnglish
Article number28577
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Jun 27

All Science Journal Classification (ASJC) codes

  • General

Fingerprint Dive into the research topics of 'THz Acoustic Spectroscopy by using Double Quantum Wells and Ultrafast Optical Spectroscopy'. Together they form a unique fingerprint.

  • Cite this