Dynamical optical tuning of the coherent phonon detection sensitivity in DBR-based GaAs optomechanical resonators

Sesin, P.; Soubelet, Pedro; Villafañe, Viviana; Bruchhausen, A. E.; Jusserand, B.; Lemaı̂tre, A.; Lanzillotti‐Kimura, N. D.; Fainstein, A.

doi:10.1103/physrevb.92.075307

Cited by 13 publications

(17 citation statements)

References 44 publications

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“…26,27 As we have demonstrated previously, this structure works as an optomechanical resonator that simultaneously confines photons and acoustic phonons of the same wavelength. 11,22,[28][29][30] In the MQW microcavity the λ/2 spacer is constituted by six 14.5 nm GaAs QWs separated by 6.1 nm AlAs barriers. To further enhance the light-sound coupling the second and fourth λ/2 DBR alloy layers on each side are also replaced by three GaAs/AlAs QWs.…”

Section: Resultsmentioning

confidence: 99%

Optoelectronic forces with quantum wells for cavity optomechanics in GaAs/AlAs semiconductor microcavities

et al. 2018

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Radiation pressure, electrostriction, and photothermal forces have been investigated to evidence backaction, non-linearities and quantum phenomena in cavity optomechanics. We show here through a detailed study of the relative intensity of the cavity mechanical modes observed when exciting with pulsed lasers close to the GaAs optical gap that optoelectronic forces involving real carrier excitation and deformation potential interaction are the strongest mechanism of light-to-sound transduction in semiconductor GaAs/AlAs distributed Bragg reflector optomechanical resonators. We demonstrate that the ultrafast spatial redistribution of the photoexcited carriers in microcavities with massive GaAs spacers leads to an enhanced coupling to the fundamental 20 GHz vertically polarized mechanical breathing mode. The carrier diffusion along the growth axis of the device can be enhanced by increasing the laser power, or limited by embedding GaAs quantum wells in the cavity spacer, a strategy used here to prove and engineer the optoelectronic forces in phonon generation with real carriers. The wavelength dependence of the observed phenomena provide further proof of the role of optoelectronic forces. The optical forces associated to the different intervening mechanisms and their relevance for dynamical backaction in optomechanics are evaluated using finite-element methods. The results presented open the path to the study of hitherto seldom investigated dynamical backaction in optomechanical solid-state resonators in the presence of optoelectronic forces.

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Section: Resultsmentioning

confidence: 99%

Optoelectronic forces with quantum wells for cavity optomechanics in GaAs/AlAs semiconductor microcavities

et al. 2018

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“…4), which coincides with the passage of the optical mode over the maximum of the laser spectral density (labeled as 2 in Fig. 2), where the modulation on the reflected intensity due to the vibrations is negligible [29]. The exact delay at which it occurs depends both on the initial detuning and on the recovery time τ e , and since τ e depends on size, so does t π .…”

Section: Resultsmentioning

confidence: 67%

“…Here we focus on the electronic response and the detuning dependence of the coherent generation and detection process. The traces show a π phase shift [29] and a necking at a given delay t π (black circles in Fig. 4), which coincides with the passage of the optical mode over the maximum of the laser spectral density (labeled as 2 in Fig.…”

Section: Resultsmentioning

confidence: 71%

Optical cavity mode dynamics and coherent phonon generation in high- Q micropillar resonators

et al. 2018

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We study the temporal dynamics of photoexcited carriers in distributed Bragg reflector based semiconductor micropillars at room temperature. Their influence on the process of coherent phonon generation and detection is analyzed by means of pump-probe microscopy. The dependence of the measured mechanical signatures on laser-cavity detuning is explained through a model that accounts for the varying light-cavity coupling existent during the ultrashort times that pump and probe pulses dwell within the structure. To do so, we first explain the optical mode dynamics with an electron-hole diffusion model that accounts for the escape of carriers from the probed area, as well as their recombination in the bulk and on the free surfaces. We thus show that the latter is the most influential factor for pillars below ∼10 μm, where 3D confinement of the optical and mechanical fields becomes relevant.

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“…magnetic field stimulation in ferrite [14], integrated phononic circuitry [15], and acoustic nanocavities [16,17]. The straightforward way to manipulating CAPs on a picosecond time scale is to do so in tailored nanostructures and materials, since the properties of laser-induced coherent picosecond acoustic phonons are strongly dependent on the nature of the constituent layers, their thicknesses, and periods of layered structures or thin-films [18].…”

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confidence: 99%

All optical control of comb-like coherent acoustic phonons in multiple quantum well structures through double-pump-pulse pump-probe experiments

Li¹,

Gusev²,

Dekorsy³

et al. 2019

Opt. Express

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We present an advancement in applications of ultrafast optics in picosecond laser ultrasonics -laser-induced comb-like coherent acoustic phonons are optically controlled in a In 0.27 Ga 0.73 As/GaAs multiple quantum well (MQW) structure by a high-speed asynchronous optical sampling (ASOPS) system based on two GHz Yb:KYW lasers. Two successive pulses from the same pump laser are used to excite the MQW structure. The second pump light pulse has a tunable time delay with respect to the first one and can be also tuned in intensity, which enables the amplitude and phase modulation of acoustic phonons. This yields rich temporal acoustic patterns with suppressed or enhanced amplitudes, various wave-packet shapes, varied wave-packet widths, reduced wave-packet periods and varied phase shifts of singleperiod oscillations within a wave-packet. In the frequency domain, the amplitude and phase shift of the individual comb component present a second-pump-delay-dependent cosinewave-like and sawtooth-wave-like variation, respectively, with a modulation frequency equal to the comb component frequency itself. The variations of the individual component amplitude and phase shift by tuning the second pump intensity exhibit an amplitude valley and an abrupt phase jump at the ratio around 1:1 of the two pump pulse intensities for certain time delays. A simplified model, where both generation and detection functions are assumed as a cosine stress wave enveloped by Gaussian or rectangular shapes in an infinite periodic MQW structure, is developed in order to interpret acoustic manipulation in the MQW sample. The modelling agrees well with the experiment in a wide range of time delays and intensity ratios. Moreover, by applying a heuristic-analytical approach and nonlinear corrections, the improved calculations reach an excellent agreement with experimental results and thus enable to predict and synthesize coherent acoustic wave patterns in MQW structures.

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Dynamical optical tuning of the coherent phonon detection sensitivity in DBR-based GaAs optomechanical resonators

Cited by 13 publications

References 44 publications

Optoelectronic forces with quantum wells for cavity optomechanics in GaAs/AlAs semiconductor microcavities

Optoelectronic forces with quantum wells for cavity optomechanics in GaAs/AlAs semiconductor microcavities

Optical cavity mode dynamics and coherent phonon generation in high- Q micropillar resonators

All optical control of comb-like coherent acoustic phonons in multiple quantum well structures through double-pump-pulse pump-probe experiments

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