Watching Ripples on Crystals

Y. Sugawara; O. B. Wright; O. Matsuda; M. Takigahira; Y. Tanaka; S. Tamura; V. E. Gusev

doi:10.1103/PhysRevLett.88.185504

Watching Ripples on Crystals

Y. Sugawara, O. B. Wright, O. Matsuda, M. Takigahira, Y. Tanaka, S. Tamura, and V. E. Gusev

Phys. Rev. Lett. 88, 185504 – Published 18 April 2002

Abstract

We present a new method for imaging surface phonon focusing and dispersion at frequencies up to 1 GHz that makes use of ultrafast optical excitation and detection. Animations of coherent surface phonon wave packets emanating from a point source on isotropic and anisotropic solids are obtained with micron lateral resolution. We resolve rounded-square shaped wave fronts on the (100) plane of LiF and discover isolated pockets of pseudosurface wave propagation with exceptionally high group velocity in the (001) plane of ${TeO}_{2}$ . Surface phonon refraction and concentration in a minute gold pyramid is also revealed.

Received 26 December 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.185504

Authors & Affiliations

Y. Sugawara¹, O. B. Wright^1,*, O. Matsuda¹, M. Takigahira¹, Y. Tanaka¹, S. Tamura¹, and V. E. Gusev²

¹Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
²Université du Maine, Avenue O. Messiaen, 72085 Le Mans, Cedex 09, France