Enhanced optomechanical readout using optical coalescence

Abstract

We present a scheme to strongly enhance the readout sensitivity of the squared displacement of a mobile scatterer placed in a Fabry-Pérot cavity. We investigate the largely unexplored regime of cavity electrodynamics in which a highly reflective element positioned between the end mirrors of a symmetric Fabry-Pérot resonator strongly modifies the cavity response function, such that two longitudinal modes with different spatial parity are brought close to frequency degeneracy and interfere in the cavity output field. In the case of a movable middle reflector we show that the interference in this generic "optical coalescence" phenomenon gives rise to an enhanced frequency shift of the peaks of the cavity transmission that can be exploited in optomechanics.

5 pages, 3 figures

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• Nonlinear effects in modulated quantum optomechanics
• Collectively-enhanced optomechanical coupling in periodic arrays of scatterers
• From membrane-in-the-middle to mirror-in-the-middle with a high-reflectivity sub-wavelength grating
• Parametric amplification of light in a cavity with a moving dielectric membrane: Landau-Zener problem for the Maxwell field
• Light-matter interactions in multi-element resonators
• Spontaneous symmetry-breaking in optomechanical cavity