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Mapping gigahertz vibrations in a plasmonic-phononic crystal

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Title: Mapping gigahertz vibrations in a plasmonic-phononic crystal
Authors: Kelf, Timothy A. Browse this author
Hoshii, Wataru Browse this author
Otsuka, Paul H. Browse this author
Sakuma, Hirotaka Browse this author
Veres, Istvan A. Browse this author
Cole, Robin M. Browse this author
Mahajan, Sumeet Browse this author
Baumberg, Jeremy J. Browse this author
Tomoda, Motonobu Browse this author →KAKEN DB
Matsuda, Osamu Browse this author →KAKEN DB
Wright, Oliver B. Browse this author →KAKEN DB
Issue Date: Feb-2013
Publisher: IOP Publishing
Journal Title: New Journal of Physics
Volume: 15
Start Page: 023013
Publisher DOI: 10.1088/1367-2630/15/2/023013
Abstract: We image the gigahertz vibrational modes of a plasmonic-phononic crystal at sub-micron resolution by means of an ultrafast optical technique, using a triangular array of spherical gold nanovoids as a sample. Light is strongly coupled to the plasmonic modes, which interact with the gigahertz phonons by a process akin to surface-enhanced stimulated Brillouin scattering. A marked enhancement in the observed optical reflectivity change at the centre of a void on phononic resonance is likely to be caused by this mechanism. By comparison with numerical simulations of the vibrational field, we identify resonant breathing deformations of the voids and elucidate the corresponding mode shapes. We thus establish scanned optomechanical probing of periodic plasmonic-phononic structures as a new means of investigating their coupled excitations on the nanoscale.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: WRIGHT O. B.

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