Active chiral control of GHz acoustic whispering-gallery modes

Mezil, Sylvain; Fujita, Kentaro; Osuka, Paul H.; Tomoda, Mononobu; Clark, Matt; Wright, Oliver B.; Matsuda, Osamu

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.

Citation

Mezil, S., Fujita, K., Osuka, P. H., Tomoda, M., Clark, M., Wright, O. B., & Matsuda, O. (in press). Active chiral control of GHz acoustic whispering-gallery modes. Applied Physics Letters, https://doi.org/10.1063/1.4994886

• Journal Article Type: Article
• Acceptance Date: Aug 1, 2017
• Online Publication Date: Oct 3, 2017
• Deposit Date: Sep 18, 2017
• Publicly Available Date: Oct 3, 2017
• Journal: Applied Physics Letters
• Print ISSN: 0003-6951
• Electronic ISSN: 1077-3118
• Publisher: American Institute of Physics
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1063/1.4994886
• Public URL: https://nottingham-repository.worktribe.com/output/886013
• Publisher URL: http://aip.scitation.org/doi/10.1063/1.4994886