Frequency shift and attenuation of hypersonic surface acoustic phonons under metallic gratings

Jyothi Sadhu, J. H. Lee, Sanjiv Sinha

Research output: Contribution to journalArticlepeer-review

Abstract

Using aluminum gratings of varying duty cycles, we report picoseconds acoustics measurements of frequency shift and attenuation in surface acoustic phonons in silicon at ∼15 GHz. We observe that the frequency shifts nonlinearly with the duty cycle, particularly in the range of 0.3 to 0.5. The data deviate from the perturbation model as a sinusoidal function of the duty cycle. The attenuation peaks at 0.5 duty cycle which is in good agreement with an eigenmode analysis of the composite structure. This work elucidates the mechanism of surface acoustic phonon scattering at periodic interfaces.

Original languageEnglish (US)
Article number133106
JournalApplied Physics Letters
Volume97
Issue number13
DOIs
StatePublished - Sep 27 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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