Wright, O. B. and Veres, I. A. and Profunser, D. M. and Matsuda, O. and Culshaw, B. and Lang, U. (2011) Dynamic visualization of surface phonons in phononic crystals. Chinese Journal of Physics, 49 (1). pp. 16-22. ISSN 0577-9073Full text not available in this repository. (Request a copy from the Strathclyde author)
Using ultrashort pulsed optical excitation and interferometric detection, we dynamically image ultrahigh-frequency surface acoustic phonon wavepackets on two-dimensional (2D) phononic crystals. The samples consist of a square lattice of air-filled holes etched in a silicon substrate. Good agreement is found when compared with time-domain finite element numerical simulations. By Fourier transformation, the dispersion relation is derived and stop bands are revealed. The spatial distributions of the acoustic eigenmodes at specific frequencies are also presented.
|Keywords:||acoustic modes, Fourier transformation, phononic crystals, Physics|
|Subjects:||Science > Physics|
|Department:||Faculty of Engineering > Electronic and Electrical Engineering|
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|Depositing user:||Pure Administrator|
|Date Deposited:||17 Jul 2012 13:46|
|Last modified:||14 Jun 2013 16:24|
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