Work

Acoustic whispering-gallery modes generated and dynamically imaged with ultrashort optical pulses

Year: 2010

Type: article

Abstract: Broadband coherent surface phonon wave packets up to 1 GHz in a microscopic embedded disk are excited and dynamically imaged with ultrashort optical pulses. We isolate a whispering-gallery-like mode using a technique involving quadrature detection of the out-of-plane surface motion on modulating the optical excitation beam. The eigenmode distribution is obtained from spatiotemporal Fourier transforms and a radial-azimuthal decomposition demonstrates the selective excitation of a mode with 26-fold rotational symmetry and allows an estimate of the cavity $Q$ factor to be made.

Source: Physical Review B

DOI: 10.1103/physrevb.81.165434

Authors: Takehiro Tachizaki, Osamu Matsuda, Alex A. Maznev, Oliver B. Wright

Institution: Hokkaido University

Language: English

Topic: Acoustic Wave Resonator Technologies

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: bronze

Funder: Japan Society for the Promotion of Science

Award: Ultrafast phononic plasmonics