Active chiral control of GHz acoustic whispering-gallery modes
- 2 October 2017
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 111 (14)
- https://doi.org/10.1063/1.4994886
Abstract
We selectively generate chiral surface-acoustic whispering-gallery modes in the gigahertz range on a microscopic disk by means of an ultrafast time-domain technique incorporating a spatial light modulator. Active chiral control is achieved by making use of an optical pump spatial profile in the form of a semicircular arc, positioned on the sample to break the symmetry of clockwise- and counterclockwise-propagating modes. Spatiotemporal Fourier transforms of the interferometrically monitored two-dimensional acoustic fields measured to micron resolution allow individual chiral modes and their azimuthal mode order, both positive and negative, to be distinguished. In particular, for modes with 15-fold rotational symmetry, we demonstrate ultrafast chiral control of surface acoustic waves in a micro-acoustic system with picosecond temporal resolution. Applications include nondestructive testing and surface acoustic wave devices.Funding Information
- Engineering and Physical Sciences Research Council (EP/K021877/1)
- Japan Society for the Promotion of Science (16H03997, 16K13713, 17H02807)
- Murata Science Foundation (16K13713)
This publication has 21 references indexed in Scilit:
- Optical generation of surface acoustic waves guided at the linear boundary between two thin filmsJournal of Applied Physics, 2010
- Spatially resolved acoustic spectroscopy for fast noncontact imaging of material microstructureOptics Express, 2006
- Rapid and accurate analysis of surface and pseudo-surface waves using adaptive laser ultrasound techniquesUltrasonics, 2004
- Optical Generation and Characterization of Acoustic Waves in Thin Films: Fundamentals and ApplicationsAnnual Review of Materials Science, 2000
- Diffractive acoustic elements for laser ultrasonicsThe Journal of the Acoustical Society of America, 2000
- Circumferential creeping waves around a fluid-filled cylindrical cavity in an elastic mediumThe Journal of the Acoustical Society of America, 1997
- Imaging of surface acoustic wavesZeitschrift für Physik B Condensed Matter, 1995
- Laser generation of convergent acoustic waves for materials inspectionUltrasonics, 1985
- Whispering Gallery wave modes on elastic cylindersThe Journal of the Acoustical Society of America, 1976
- CXII. The problem of the whispering galleryThe London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 1910