title: Observation of generalized optomechanical coupling and cooling on cavity resonance.
abstract: Optomechanical coupling between a light field and the motion of a cavity mirror via radiation pressure plays an important role for the exploration of macroscopic quantum physics and for the detection of gravitational waves (GWs). It has been used to cool mechanical oscillators into their quantum ground states and has been considered to boost the sensitivity of GW detectors, e.g., via the optical spring effect. Here, we present the experimental characterization of generalized, that is, dispersive and dissipative, optomechanical coupling, with a macroscopic (1.5  mm)2-size silicon nitride membrane in a cavity-enhanced Michelson-type interferometer. We report for the first time strong optomechanical cooling based on dissipative coupling, even on cavity resonance, in excellent agreement with theory. Our result will allow for new experimental regimes in macroscopic quantum physics and GW detection.
authors: Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck Institut für Gravitationsphysik (Albert-Einstein Institut), Callinstraße 38, D-30167 Hannover, Germany.
authors: Andreas
authors: A
authors: Sawadsky
authors: Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck Institut für Gravitationsphysik (Albert-Einstein Institut), Callinstraße 38, D-30167 Hannover, Germany.
authors: Henning
authors: H
authors: Kaufer
authors: Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck Institut für Gravitationsphysik (Albert-Einstein Institut), Callinstraße 38, D-30167 Hannover, Germany and Vienna Center for Quantum Science and Technology (VCQ), Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.
authors: Ramon Moghadas
authors: RM
authors: Nia
authors: Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck Institut für Gravitationsphysik (Albert-Einstein Institut), Callinstraße 38, D-30167 Hannover, Germany and Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, D-30167 Hannover, Germany.
authors: Sergey P
authors: SP
authors: Tarabrin
authors: Department of Physics, Moscow State University, Moscow 119992, Russia.
authors: Farid Ya
authors: FY
authors: Khalili
authors: Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck Institut für Gravitationsphysik (Albert-Einstein Institut), Callinstraße 38, D-30167 Hannover, Germany and Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, D-30167 Hannover, Germany.
authors: Klemens
authors: K
authors: Hammerer
authors: Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck Institut für Gravitationsphysik (Albert-Einstein Institut), Callinstraße 38, D-30167 Hannover, Germany.
authors: Roman
authors: R
authors: Schnabel