Lifetime of THz Acoustic Nanocavity Modes

Rozas, G.; Winter, M. F. Pascual; Jusserand, B.; Fainstein, A.; Perrin, Bernard; Semenova, Elizaveta; Lemaı̂tre, A.

doi:10.1103/physrevlett.102.015502

Cited by 71 publications

(74 citation statements)

References 26 publications

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“…It should be noted that unlike spectroscopic techniques [11][12][13][14][15] capable of measuring the lifetime of a specific phonon state within the Brillouin zone, our measurements do not provide such direct MFP information. Rather, we obtain integrated information on phonon MFPs and dispersion according to Eq.…”

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confidence: 89%

“…Although the frequency-dependence of phonon lifetimes can be measured directly with inelastic neutron [11], x-ray [12], or light scattering [13], or with laser-excited coherent phonons [14,15], MFP measurements by these techniques have been limited. For example, the available experimental data for silicon do not extend beyond 100 GHz [16], far below the range of frequencies thought to be important for thermal transport at room temperature [8,10] In recent years, advances in measuring phonon MFP distributions have been made with studies of size-dependent thermal conductivity over small distances, where thermal transport deviates from Fourier's law.…”

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confidence: 99%

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Reconstructing phonon mean-free-path contributions to thermal conductivity using nanoscale membranes

et al. 2015

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Knowledge of the mean-free-path distribution of heat-carrying phonons is key to understanding phononmediated thermal transport. We demonstrate that thermal conductivity measurements of thin membranes spanning a wide thickness range can be used to characterize how bulk thermal conductivity is distributed over phonon mean free paths. A noncontact transient thermal grating technique was used to measure the thermal conductivity of suspended Si membranes ranging from 15-1500 nm in thickness. A decrease in the thermal conductivity from 74-13% of the bulk value is observed over this thickness range, which is attributed to diffuse phonon boundary scattering. Due to the well-defined relation between the membrane thickness and phonon mean-free-path suppression, combined with the range and accuracy of the measurements, we can reconstruct the bulk thermal conductivity accumulation vs. phonon mean free path, and compare with theoretical models.

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confidence: 89%

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confidence: 99%

Reconstructing phonon mean-free-path contributions to thermal conductivity using nanoscale membranes

et al. 2015

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“…Both types of modes are simultaneously observed in microcavities due to the standing wave character of the confined electromagnetic field. 40,42 As evidenced from these data, the larger intensity of the Raman peaks concentrates close to the branch's anticrossing, that is, when polaritons display similar excitonic and photonic character.…”

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confidence: 69%

“…To simplify the Raman experiments the frequency of the mechanical vibrations has been pushed up from the 20 GHz of the basic optomechanical mode of the microcavity as a whole, 22 to 250 GHz by replacing the bulk GaAs spacer of the optical microcavity by an acoustic multilayer. 39,42 The latter mostly consists of a 32 period GaAs/AlAs (14.16/5.81 nm) multiple quantum well (MQW). The experiments reported here have been performed in strong resonance with the GaAs exciton of these MQW at 1.53 eV.…”

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confidence: 99%

Polariton path to fully resonant dispersive coupling in optomechanical resonators

et al. 2014

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Resonant photoelastic coupling in semiconductor nanostructures opens new perspectives for strongly enhanced light-sound interaction in optomechanical resonators. One potential problem, however, is the reduction of the cavity Q-factor induced by dissipation when the resonance is approached. We show in this letter that cavity-polariton mediation in the light-matter process overcomes this limitation allowing for a strongly enhanced photon-phonon coupling without significant lifetime reduction in the strongly-coupled regime. Huge optomechanical coupling factors in the PetaHz/nm range are envisaged, three orders of magnitude larger than the backaction produced by the mechanical displacement of the cavity mirrors.Optomechanical resonators, that is, cavities that confine light and mechanical vibrations in the same space, strongly coupling the electromagnetic and elastic deformation fields, have emerged as novel paradigms for new fundamental ideas and applications.1-11 Optomechanical non-linearities, laser cooling, and phonon lasing 12,13 have been demonstrated. In addition, optomechanical devices have been cooled down to the quantum ground state of mechanical motion, signaling a new era of quantum phononics with implications for quantum information processing, sensitive measurements and fundamental research.14-17 Very recently hybrid systems combining cavity quantum electrodynamics (CQED) and cavity optomechanics have been theoretically proposed as a means to evidence unconventional dissipative couplings and cooling at the single-polariton level.18,19 Here we experimentally demonstrate an additional relevant characteristic of cavity polariton optomechanics, i.e., the possibility to access a hugely enhanced optomechanical coupling of dispersive photoelastic resonant nature, without significant dissipation-induced cavity Q-factor quenching.Two issues that have been identified as relevant for the development of cavity optomechanics are, on one side, the push for ever higher frequencies [20][21][22] and, on the other side, the search for new stronger optomechanical coupling mechanisms.22-25 While micromechanical devices typically oscillate in the KHz-MHz range, GHz-THz frequencies have been attained using nano-size toroids 21 and distributed Bragg reflector (DBR)-based microcavities. 22Radiation pressure is usually identified at the origin of optomechanical coupling. Direct transfer of impulse from the photon field to the resonator mirrors induces vibrations on the latter, which in turn results in a backaction on the electromagnetic field due to the resonator optical detuning induced by the mechanical displacement of the mirrors. We have recently reported that GaAs DBR- * email:afains@cab.cnea.gov.ar based microcavities constitute optimized optomechanical resonators operating in the GHz-THz range, with the potential of adding an additional photoelastic term to the above described purely "mechanical" mechanism.22 The two complementary sides of the coin in this case are electrostriction (for the generation of phonons by ligh...

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“…These conditions are far from reach with current devices, and to enhance the nonlinearity several alternative techniques have been proposed [18][19][20]. These approaches still require large optomechanical coupling rates GaAs/AlAs superlattice cavities, where a λ/2 cavity is enclosed by two distributed Bragg reflector (DBR) mirrors, can simultaneously confine the light field and the mechanical field [21,22]. The great advantage of superlattice planar cavities is that the large overlap between both optical and vibrational fields in the cavity region and the photoelastic effect leads to high optomechanical coupling rates [21].…”

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confidence: 99%

Acoustic confinement in superlattice cavities

García-Sánchez

Deléglise²,

Thomas

et al. 2016

Phys. Rev. A

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The large coupling rate between the acoustic and optical fields confined in GaAs/AlAs superlattice cavities makes them appealing systems for cavity optomechanics. We have developed a mathematical model based on the scattering matrix that allows the acoustic guided modes to be predicted in nano and micropillar superlattice cavities. We demonstrate here that the reflection at the surface boundary considerably modifies the acoustic quality factor and leads to significant confinement at the micropillar center. Our mathematical model also predicts unprecedented acoustic Fano resonances on nanopillars featuring small mode volumes and very high mechanical quality factors, making them attractive systems for optomechanical applications.

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Lifetime of THz Acoustic Nanocavity Modes

Cited by 71 publications

References 26 publications

Reconstructing phonon mean-free-path contributions to thermal conductivity using nanoscale membranes

Reconstructing phonon mean-free-path contributions to thermal conductivity using nanoscale membranes

Polariton path to fully resonant dispersive coupling in optomechanical resonators

Acoustic confinement in superlattice cavities

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