Scientific Results

Stimulated Brillouin Cavity Optomechanics in Liquid Droplets

Year: 2018

Authors: Giorgini A., Avino S., Malara P., De Natale P., Yannai M., Carmon T., Gagliardi G.

Autors Affiliation: Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei, 34—Comprensorio A. Olivetti, 80078 Pozzuoli (Naples), Italy; Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), Largo E. Fermi 6, 50125 Firenze, Italy; Mechanical Engineering Department, Technion Israel Institute of Technology, 32000 Haifa, Israel

Abstract: Liquid droplets are ubiquitous in nature wherein surface tension shapes them into perfect spheres with atomic-scale smooth surfaces. Here, we use stable droplets that cohost equatorial acoustical and optical resonances phase matched to enable the exchange of energy and momentum between sound and light. Relying on free-space laser excitation of multiple whispering-gallery modes, we harness a triple-resonant forward Brillouin scattering to stimulate optomechanical surface waves. Nonlinear amplification of droplet vibrations in the 60-70 MHz range is realized with spectral narrowing beyond the limit of material loss, thereby activating the droplet as hypersound-laser emitter.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 120 (7)      Pages from: 073902-1  to: 073902-5

More Information: This research work was supported by the P. O. R. Campania FESR 2007-2013 project titled \”BERSAGLI.\” The authors are grateful to G. Notariale for his technical assistance.
KeyWords: Brillouin scattering; Forward scattering; Laser excitation; Phase matching; Quantum optics; Surface waves; Whispering gallery modes, Cavity optomechanics; Exchange of energy; Liquid droplets; Nonlinear amplification; Optical resonance; Smooth surface; Spectral narrowing; Stimulated Brillouin, Drops
DOI: 10.1103/PhysRevLett.120.073902

Citations: 19
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