2024-03-29T08:51:19Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/57912022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139Watching Ripples on CrystalsSugawara, Y.Wright, O. B.Matsuda, O.Takigahira, M.Tanaka, Y.Tamura, S.Gusev2, V. E.425.4We 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 TeO2. Surface phonon refraction and concentration in a minute gold pyramid is also revealed.American Physical SocietyJournal Articleapplication/pdfhttp://hdl.handle.net/2115/5791https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/5791/1/PRL88.pdf0031-9007PHYSICAL REVIEW LETTERS88181855042002-04-18enginfo:pmid/12005696info:doi/10.1103/PhysRevLett.88.185504Copyright © 2002 American Physical Societypublisher