Opto-mechanical oscillator in a nanoliter droplet

Year: 2018

Authors: Giorgini A., Avino S., Malara P., De Natale P., Gagliardi G.

Autors Affiliation: Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei, 34—Comprensorio A. Olivetti, Pozzuoli, 80078, Italy; Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), Largo E. Fermi 6, Firenze, 50125, Italy

Abstract: Droplets are very simple physical systems, whereby surface tension shapes liquids into ideal opto-mechanical devices. This has recently enabled low-viscosity liquid samples to serve as miniature acoustic resonators harnessing optical generation of bulk vibrations, capillaries, or surface waves. Uniquely, a simple room-temperature pendant droplet can be activated as a hypersound-laser emitter when illuminated by a free-space, low-power visible laser thanks to stimulated Brillouin scattering of optical and acoustic whispering-gallery modes. Here, we demonstrate continuous operation of a liquid polymer opto-mechanical resonator and characterize its quality factor and long-term frequency stability. Our results point to the feasibility of all-liquid micro-mechanical oscillators working in the 50-100 MHz range. The stimulated generation of high-quality surface waves on nanoliter droplets gives momentum to new optical schemes for characterization of material viscous-elastic properties, laboratory investigation of atmospheric phenomena, and mass sensing for direct analysis of biological fluids based on ultrasound-hypersound coherent generation and detection. (C) 2018 Optical Society of America

Journal/Review: OPTICS LETTERS

Volume: 43 (15)      Pages from: 3473  to: 3476

More Information: P.O.R. Campania FESR 2007-2013 (project BERSAGLI); Italian Ministry of Education & Research, International Project on Extreme Light Infrastructure (ELI).
A. G. acknowledges support by the Italian Ministry of Education & Research project on Extreme Light Infrastructure. The authors are grateful to T. Carmon for helpful discussions and G. Notariale for technical assistance.
KeyWords: Acoustic resonators; Biological materials; Brillouin scattering; Drops; Liquids; Oscillators (mechanical); Oscillistors; Surface waves; Ultrasonic applications; Viscosity of liquids; Whispering gallery modes; Atmospheric phenomena; Continuous operation; High quality surface; Laboratory investigations; Long term frequency stability; Low-viscosity liquids; Micromechanical oscillators; Stimulated generation, Optomechanics; Polymer; Chemistry; Evices; Mechanics; Nanotechnology; Optical instrumentation; Oscillometry; Mechanical Phenomena; Nanotechnology; Optical Devices; Oscillometry; Polymers
DOI: 10.1364/OL.43.003473

Citations: 8
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