Optomechanics II

14:00 : Nonlinear mechanics of photonic crystal deformable mirrors actuated via electrostatic force

Avishek Chowdhury, I. Yeo, G. Beaudoin, I. Robert-Philip, R. Braive

CNRS (France)

Non-linearity in the nanomechanical systems have essential applications in sensing, signal processing and in many different fields of modern science and its applications. In this paper we demonstrate use of a unique photonic crystal membrane-electrode system for optomechanics where we were able to demonstrate bistability in the system along with parametric sub-harmonic excitations. These platforms are fabricated using 3D-heterogenous integration techniques and uses electrostatic force for excitation and optical interferometric schemes for detection of the mechanical modes.
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14:15 : Integrated optomechanical cavity-waveguide system for coherent photonic-microwave signal processing

Kejie Fang, Matt Matheny, Xingsheng Luan, Oskar Painter

California Institute of Technology (USA)

In an integrated silicon optomechanical cavity-waveguide system, we demonstrated on-chip coherent photonic-microwave signal processing which shows clear advantages over purely photonic methods. Specifically, we obtain an optical delay of 13.3 us for a phonon waveguide length of 43 um. In addition, we demonstrated microwave filter with reconfigurable pass/rejection bands in the gigahertz band due to the radiation-pressure force induced boundary condition change.
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14:30 : Remote Phonon Entanglement on a Photonic Crystal Architecture

H. Flayac, M. Minkov, V. Savona

Ecole Polytechnique Federale de Lausanne (Switzerland)

We propose a realistic heralding protocol for the preparation of remote entangled mechanical states in photonic crystal cavities. Our approach relies on the optomechanical properties of a silicon-based nanobeam structure. Pulsed sideband excitation of a Stokes process combined with a single photon detection allows writing a mechanical Bell state which can be transferred to the optical field through the anti-Stokes process. The entanglement of the nonclassical state is tested through the visibility of a characteristic quantum interference pattern.
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14:45 : Reversible Quantum Opto-Acoustic Convertor

Vitaly Shumeiko

Chalmers University of Technology (Sweden)

We propose reversible interface between quantized microwave field and optical field using surface acoustic waves (SAW) as a mediator medium. SAW in piezoelectric crystals are strongly coupled to microwave photons at GHz frequencies commonly used in operation of solid state quantum devices. Coupling of SAW to optical photons is provided by elastooptic interaction, and quantum phonon-photon conversion employs the effect of stimulated Brillouin scattering. With the proposed method conversion can be realized on integrated solid state chip.
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15:00 : Dispersive and dissipative optomechanical coupling in heterogeneously integrated 2D photonic crystal system

Viktor Tsvirkun, A. Surrente, G. Beaudoin, F. Raineri, R. Raj, I. Robert-Philip, R. Braive

Laboratoire de Photonique et de Nanostructures, LPN-CNRS (France)

We report on optomechanical effects in 2D photonic crystal defect cavities coupled to integrated silicon waveguides of different widths. Mechanical modes are observed systematically on a chip scale. By tuning the excitation laser wavelength, we observe optical spring effects. We extract optomechanical coupling coefficients and demonstrate the dispersive and dissipative nature of optomechanical coupling. Their relative contribution can be controlled by modifying the waveguide width, thereby paving the way for a control of optomechanical coupling on the wafer level.
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