title: Brillouin cavity optomechanics with microfluidic devices.
abstract: Cavity optomechanics allows the parametric coupling of phonon- and photon-modes in microresonators and is presently investigated in a broad variety of solid-state systems. Optomechanics with superfluids has been proposed as a path towards ultra-low optical- and mechanical-dissipation. However, there have been no optomechanics experiments reported with non-solid phases of matter. Direct liquid immersion of optomechanics experiments is challenging, as the acoustic energy simply leaks out to the higher-impedance liquid surrounding the device. Here we confine liquids within hollow resonators to circumvent this issue and to enable optical excitation of mechanical whispering-gallery modes at frequencies ranging from 2 to 11,000 MHz. Our device enables optomechanical investigation with liquids, while light is conventionally coupled from the outer dry side of the capillary, and liquids are provided by means of a standard microfluidic inlet.
authors.affiliation: Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. bahl@illinois.edu
authors.forename: Gaurav
authors.initials: G
authors.lastname: Bahl
authors.forename: Kyu Hyun
authors.initials: KH
authors.lastname: Kim
authors.forename: Wonsuk
authors.initials: W
authors.lastname: Lee
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.forename: Xudong
authors.initials: X
authors.lastname: Fan
authors.forename: Tal
authors.initials: T
authors.lastname: Carmon