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Anderson Photon-Phonon Colocalization in Certain Random Superlattices.
G Arregui1,2, N D Lanzillotti-Kimura3, C M Sotomayor-Torres1,4
1Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
Physical Review Letters
|February 16, 2019
Summary
Disordered photonic crystals enable strong light-matter interactions by precisely overlapping optical and mechanical fields. This breakthrough facilitates exploring Anderson localization of high-frequency phonons via cavity optomechanics.
Area of Science:
- Quantum Optics and Cavity Optomechanics
- Condensed Matter Physics
- Nanoscale Photonics and Phononics
Background:
- Optomechanical systems are crucial for fundamental physics, from gravitational wave detection to quantum ground state cooling.
- Engineering light-matter interaction typically requires optimizing spatial overlap between optical and mechanical fields in resonators.
- Disorder offers an alternative for nanoscale light and sound confinement but lacks guaranteed colocalization due to complex interference.
Purpose of the Study:
- To propose a novel strategy for achieving high colocalization of optical and mechanical fields using geometrical disorder.
- To investigate the potential of GaAs/AlAs distributed Bragg reflectors with embedded disorder for enhanced light-matter interaction.
- To explore Anderson localization of high-frequency phonons enabled by cavity optomechanics in such disordered systems.
Main Methods:
- Utilized GaAs/AlAs vertical distributed Bragg reflectors with embedded geometrical disorder.
- Leveraged a physical parameter coincidence between GaAs and AlAs for light and acoustic wave propagation.
- Analyzed the equivalence of equations for longitudinal acoustic waves and normal-incidence light at specific wavelengths.
Main Results:
- Demonstrated guaranteed spatial overlap between electromagnetic and displacement fields for specific photon-phonon pairs.
- Observed a statistical enhancement in the vacuum optomechanical coupling rate (g₀).
- Identified the system as a promising platform for exploring Anderson localization of high-frequency (∼20 GHz) phonons.
Conclusions:
- The proposed disordered photonic structure effectively achieves colocalization of optical and mechanical fields.
- This colocalization leads to strong light-matter interaction and enhanced optomechanical coupling.
- The findings open new avenues for exploring Anderson localization phenomena and engineering light-matter interactions via localized states.
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