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Electro-Optomechanical Modulation Instability in a Semiconductor Resonator.

Pierre Etienne Allain1, Biswarup Guha1, Christophe Baker1

  • 1Matériaux et Phénomènes Quantiques, Université de Paris, CNRS UMR 7162, 10 rue Alice Domon et Léonie Duquet 75013 Paris, France.

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Summary
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Researchers observed an electro-optomechanical modulation instability in a gallium arsenide disk resonator, leading to ultrahigh-frequency mechanical combs. This novel regime is stabilized by light-matter, carrier, and thermal interactions, offering optical control.

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Area of Science:

  • Optomechanics
  • Semiconductor Nanotechnology
  • Photonics

Background:

  • Canonical radiation pressure coupling in nano-optomechanical resonators can be enhanced by light-matter interactions.
  • New dynamical regimes emerge from these enriched couplings, expanding the scope of light-mechanical interplay.

Purpose of the Study:

  • To observe and characterize an electro-optomechanical modulation instability in a semiconductor disk resonator.
  • To investigate the underlying mechanisms and spectral signatures of this novel dynamical regime.

Main Methods:

  • Utilized a gallium arsenide disk resonator to study light-matter interactions.
  • Analyzed radio-frequency and optical spectrums to identify comb formation.
  • Investigated the role of photothermal interactions and carrier dynamics.

Main Results:

  • Observed a novel electro-optomechanical modulation instability.
  • Concomitant formation of dense radio-frequency and optical frequency combs.
  • Evidence of permanent pulsatory dynamics in mechanical motion and optical intensity.
  • Stabilization of an extended mechanical comb in the ultrahigh frequency range.

Conclusions:

  • The observed instability is stabilized by mutual coupling between light, mechanical oscillations, carriers, and heat.
  • Photothermal interactions play a crucial role in stabilizing the ultrahigh-frequency mechanical comb.
  • The system demonstrates optical controllability of the mechanical comb, opening avenues for advanced applications.