title: Brillouin Optomechanics in Coupled Silicon Microcavities.
abstract: The simultaneous control of optical and mechanical waves has enabled a range of fundamental and technological breakthroughs, from the demonstration of ultra-stable frequency reference devices, to the exploration of the quantum-classical boundaries in optomechanical laser-cooling experiments. More recently, such an optomechanical interaction has been observed in integrated nano-waveguides and microcavities in the Brillouin regime, where short-wavelength mechanical modes scatter light at several GHz. Here we engineer coupled optical microcavities to enable a low threshold excitation of mechanical travelling-wave modes through backward stimulated Brillouin scattering. Exploring the backward scattering we propose silicon microcavity designs based on laterally coupled single and double-layer cavities, the proposed structures enable optomechanical coupling with very high frequency modes (11 to 25 GHz) and large optomechanical coupling rates (g0/2π) from 50 kHz to 90 kHz.
authors.affiliation: Gleb Wataghin Physics Institute, University of Campinas, 13083-859 Campinas, SP, Brazil.
authors.forename: Y A V
authors.initials: YA
authors.lastname: Espinel
authors.affiliation: Gleb Wataghin Physics Institute, University of Campinas, 13083-859 Campinas, SP, Brazil.
authors.forename: F G S
authors.initials: FG
authors.lastname: Santos
authors.affiliation: Gleb Wataghin Physics Institute, University of Campinas, 13083-859 Campinas, SP, Brazil.
authors.forename: G O
authors.initials: GO
authors.lastname: Luiz
authors.affiliation: Gleb Wataghin Physics Institute, University of Campinas, 13083-859 Campinas, SP, Brazil.
authors.forename: T P Mayer
authors.initials: TP
authors.lastname: Alegre
authors.affiliation: Gleb Wataghin Physics Institute, University of Campinas, 13083-859 Campinas, SP, Brazil.
authors.forename: G S
authors.initials: GS
authors.lastname: Wiederhecker