Femtosecond ultrasonic spectroscopy using a piezoelectric nanolayer: Hypersound attenuation in vitreous silica films

Yu Chieh Wen, Shi Hao Guol, Hung Pin Chen, Jinn Kong Sheu, Chi Kuang Sun

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We report ultra-broadband ultrasonic spectroscopy with an impedance-matched piezoelectric nanolayer, which enables optical generation and detection of a 730-fs acoustic pulse (the width of ten lattice constants). The bandwidth improvement facilitates THz laser ultrasonics to bridge the spectral gap between inelastic light and x-ray scatterings (0.1-1 THz) in the studies of lattice dynamics. As a demonstration, this method is applied to measure sound attenuation in a vitreous SiO2 thin film. Our results extend the existing low-frequency data obtained by ultrasonic-based and light scattering methods and also show a f2 behavior for frequencies f up to 650 GHz.

Original languageEnglish
Article number051913
JournalApplied Physics Letters
Volume99
Issue number5
DOIs
Publication statusPublished - 2011 Aug 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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