Active chiral control of GHz acoustic whispering-gallery modes

Mezil, Sylvain and Fujita, Kentaro and Osuka, Paul H. and Tomoda, Mononobu and Clark, Matt and Wright, Oliver B. and Matsuda, Osamu (2017) Active chiral control of GHz acoustic whispering-gallery modes. Applied Physics Letters . ISSN 1077-3118

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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.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Identification Number: 10.1063/1.4994886
Depositing User: Clark, Matt
Date Deposited: 18 Sep 2017 10:22
Last Modified: 23 Oct 2017 14:13
URI: http://eprints.nottingham.ac.uk/id/eprint/46457

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