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Rémy Braive
(Laboratoire C2N)

Monday, May 9th 2022 at 11:00 am


Title : “Stochastic resonance and imperfect synchronization in chaos with electro-optomechanical photonic crystal membranes”


Optomechanics is the field devoted to the study of interactions between optical and mechanical degrees of freedom. This field emerged in the mid-1990s in the context of the study of the fundamental processes involved in interferometric measurements, and their implications for the detection of gravitational waves. This booming field is, even today, mainly focused on the measurement of microscopic mechanical resonators with a precision reaching the quantum limit. However, other innovative concepts taking advantage of the strong interaction between optics and acoustics in microscopic objects are within reach. Thus, we are investigating optomechanics on suspended photonic crystal membranes. According to the arrangement of holes, the membrane can either act as a deformable end-mirror in a conventional Fabry-Perot cavity (Figure 1) or include a cavity of diffraction-limited volume that simultaneously confines both phonons (i.e., mechanical vibrations) and photons. These suspended structures sustain mechanical modes ranging from the MHz to the GHz. Depending on the configuration, photonic crystal membranes allow studying either nonlinear dynamics of single and coupled opto-electromechanical resonators for weak signal detection or microwave optomechanical oscillators [1] for high purity signal generation.

In this seminar, I will mainly focus on the use of the former configuration where noise and chaos, usually consider as a nuisance for the first one and a sign of unpredictability for the second, are used to demonstrate counterintuitive phenomenon. A first important example is the implementation of noise induced resonance phenomena such as stochastic resonance [2] with a single electrooptomechanical resonator. A second example demonstrate imperfect phase synchronization in the chaotic regime of two coupled resonators [3].

[1] Ghorbel et al, APL Photonics 4, 116103 (2019)
[2] Chowdhury et al, Phys. Rev. Lett. 119, 234101 (2017)
[3] Madiot et al, Phys. Rev. A 104, 023525 (2021)