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.
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2 October 2017
Research Article|
October 03 2017
Active chiral control of GHz acoustic whispering-gallery modes
Sylvain Mezil;
Sylvain Mezil
1
Division of Applied Physics, Graduate School of Engineering, Hokkaido University
, Sapporo 060-8628, Japan
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Kentaro Fujita;
Kentaro Fujita
1
Division of Applied Physics, Graduate School of Engineering, Hokkaido University
, Sapporo 060-8628, Japan
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Paul H. Otsuka;
Paul H. Otsuka
1
Division of Applied Physics, Graduate School of Engineering, Hokkaido University
, Sapporo 060-8628, Japan
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Motonobu Tomoda;
Motonobu Tomoda
1
Division of Applied Physics, Graduate School of Engineering, Hokkaido University
, Sapporo 060-8628, Japan
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Matt Clark
;
Matt Clark
2
Division of Electrical Systems and Optics, University of Nottingham
, Nottingham, NG7 2RD, United Kingdom
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Oliver B. Wright;
Oliver B. Wright
1
Division of Applied Physics, Graduate School of Engineering, Hokkaido University
, Sapporo 060-8628, Japan
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Osamu Matsuda
Osamu Matsuda
a)
1
Division of Applied Physics, Graduate School of Engineering, Hokkaido University
, Sapporo 060-8628, Japan
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a)
Electronic mail: omatsuda@eng.hokudai.ac.jp
Appl. Phys. Lett. 111, 144103 (2017)
Article history
Received:
July 08 2017
Accepted:
September 08 2017
Citation
Sylvain Mezil, Kentaro Fujita, Paul H. Otsuka, Motonobu Tomoda, Matt Clark, Oliver B. Wright, Osamu Matsuda; Active chiral control of GHz acoustic whispering-gallery modes. Appl. Phys. Lett. 2 October 2017; 111 (14): 144103. https://doi.org/10.1063/1.4994886
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