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Cavity Optomechanics with Anderson-Localized Optical Modes.

G Arregui1,2, R C Ng1, M Albrechtsen2

  • 1Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain.

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|February 10, 2023
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This summary is machine-generated.

Structural disorder in photonic crystals creates Anderson-localized optical modes. This enables strong light-matter interactions in cavity optomechanics, leading to enhanced mechanical amplification and new research avenues.

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Area of Science:

  • Optics
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Cavity optomechanics enhances light-matter interactions, enabling phenomena like optomechanically induced transparency.
  • Previous studies overlooked the role of structural disorder in optomechanical systems.
  • Disorder, typically analyzed using statistical physics, has not been explored in conjunction with optomechanics.

Purpose of the Study:

  • To investigate the impact of structural disorder on light confinement and optomechanical interactions in photonic crystal waveguides.
  • To explore Anderson localization of light induced by sidewall roughness in air-slot photonic crystal waveguides.
  • To study the optomechanical coupling between disorder-induced optical modes and mechanical modes.

Main Methods:

  • Fabrication of air-slot photonic crystal waveguides with controlled sidewall roughness.
  • Characterization of optical modes using high-quality factors and sub-diffraction-limit mode volumes.
  • Measurement of optomechanical coupling rates and observation of optomechanical backaction.

Main Results:

  • Demonstration of Anderson-localized optical modes with quality factors up to 500,000 due to sidewall roughness.
  • Observation of strong optomechanical coupling rates exceeding 200 kHz.
  • Induction of mechanical amplification up to self-sustained oscillations via optomechanical backaction.

Conclusions:

  • Sidewall roughness in photonic crystals can induce Anderson localization, creating novel optical modes.
  • The interplay between disorder and optomechanics opens new avenues for exploring complex coupled systems.
  • This work pioneers the study of optomechanics in the multiple-scattering regime.