Collectively-enhanced optomechanical coupling in periodic arrays of
  scatterers

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Abstract

We investigate the optomechanical properties of a periodic array of identical scatterers placed inside an optical cavity and extend the results of [A. Xuereb, C. Genes, and A. Dantan, Phys. Rev. Lett. 109, 223601 (2012)]. We show that operating at the points where the array is transmissive results in linear optomechanical coupling strengths between the cavity field and collective motional modes of the array that may be several orders of magnitude larger than is possible with an equivalent reflective ensemble. We describe and interpret these effects in detail and investigate the nature of the scaling laws of the coupling strengths for the different transmissive points in various regimes.

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Laser cooling of a nanomechanical oscillator into its quantum ground state

Jeff Hill, Amir Safavi-Naeini, Alex Krause … (2011)

A patterned Si nanobeam is formed which supports co-localized acoustic and optical resonances that are coupled via radiation pressure. Starting from a bath temperature of T=20K, the 3.68GHz nanomechanical mode is cooled into its quantum mechanical ground state utilizing optical radiation pressure. The mechanical mode displacement fluctuations, imprinted on the transmitted cooling laser beam, indicate that a final phonon mode occupancy of 0.85 +-0.04 is obtained.

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Cavity cooling of a microlever.

Constanze Höhberger Metzger, Khaled Karrai (2004)

The prospect of realizing entangled quantum states between macroscopic objects and photons has recently stimulated interest in new laser-cooling schemes. For example, laser-cooling of the vibrational modes of a mirror can be achieved by subjecting it to a radiation or photothermal pressure, actively controlled through a servo loop adjusted to oppose its brownian thermal motion within a preset frequency window. In contrast, atoms can be laser-cooled passively without such active feedback, because their random motion is intrinsically damped through their interaction with radiation. Here we report direct experimental evidence for passive (or intrinsic) optical cooling of a micromechanical resonator. We exploit cavity-induced photothermal pressure to quench the brownian vibrational fluctuations of a gold-coated silicon microlever from room temperature down to an effective temperature of 18 K. Extending this method to optical-cavity-induced radiation pressure might enable the quantum limit to be attained, opening the way for experimental investigations of macroscopic quantum superposition states involving numbers of atoms of the order of 10(14).

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Strong dispersive coupling of a high finesse cavity to a micromechanical membrane

Florian Marquardt, S Girvin, J. Harris … (2007)

Macroscopic mechanical objects and electromagnetic degrees of freedom couple to each other via radiation pressure. Optomechanical systems with sufficiently strong coupling are predicted to exhibit quantum effects and are a topic of considerable interest. Devices reaching this regime would offer new types of control of the quantum state of both light and matter and would provide a new arena in which to explore the boundary between quantum and classical physics. Experiments to date have achieved sufficient optomechanical coupling to laser-cool mechanical devices but have not yet reached the quantum regime. The outstanding technical challenge in this field is integrating sensitive micromechanical elements (which must be small, light, and flexible) into high finesse cavities (which are typically much more rigid and massive) without compromising the mechanical or optical properties of either. A second, and more fundamental, challenge is to read out the mechanical element's quantum state: displacement measurements (no matter how sensitive) cannot determine the energy eigenstate of an oscillator, and measurements which couple to quantities other than displacement have been difficult to realize. Here we present a novel optomechanical system which seems to resolve both these challenges. We demonstrate a cavity which is detuned by the motion of a thin dielectric membrane placed between two macroscopic, rigid, high-finesse mirrors. This approach segregates optical and mechanical functionality to physically distinct structures and avoids compromising either. It also allows for direct measurement of the square of the membrane's displacement, and thus in principle the membrane's energy eigenstate. We estimate it should be practical to use this scheme to observe quantum jumps of a mechanical system.

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Publication date Created: 16 April 2013

Publication date Updated: 2013-11-04

Article

DOI: 10.1103/PhysRevA.88.053803

ArXiV ID: 1304.4574

SO-VID: c05f09db-b0c2-4654-af55-78be7155fc09

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http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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Journal reference Phys. Rev. A 88, 053803 (2013)

Comments 14 pages, 14 figures, comments welcome. This is an expanded version of arXiv:1202.6210 with added interpretation and analysis

Categories quant-ph physics.atom-ph physics.optics

ScienceOpen disciplines: Quantum physics & Field theory,Optical materials & Optics,Atomic & Molecular physics

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ScienceOpen disciplines: Quantum physics & Field theory, Optical materials & Optics, Atomic & Molecular physics

Collectively-enhanced optomechanical coupling in periodic arrays of scatterers

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Abstract

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Silicon thin film solar cells

Most cited references 38

Laser cooling of a nanomechanical oscillator into its quantum ground state

Cavity cooling of a microlever.

Strong dispersive coupling of a high finesse cavity to a micromechanical membrane

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