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Towards GHz-THz cavity optomechanics in DBR-based semiconductor resonators
N D Lanzillotti-Kimura1, A Fainstein2, B Jusserand3
1Laboratoire de Photonique et de Nanostructures, C.N.R.S., 91460 Marcoussis, France.
Ultrasonics
|June 26, 2014
Summary
Distributed Bragg reflectors (DBRs) were optimized for GHz-THz resonators, achieving simultaneous light and phonon confinement. These findings suggest DBR-based cavities could form highly efficient optomechanical resonators.
Area of Science:
- Optics and Photonics
- Materials Science
- Acoustics
Background:
- Acoustic distributed Bragg reflectors (DBRs) are crucial for confining acoustic waves.
- Optimizing resonators for GHz-THz frequencies requires precise material and structural engineering.
Purpose of the Study:
- To optimize acoustic distributed Bragg reflectors (DBRs) for operation in the GHz-THz regime.
- To investigate the simultaneous confinement of light and phonons in GaAlAs alloy structures.
- To explore the potential of DBR-based cavities as efficient optomechanical resonators.
Main Methods:
- Molecular beam epitaxy for growing GaAlAs alloy structures.
- Time-resolved differential optical reflectivity experiments using femtosecond-picosecond laser pulses.
- Simulations using standard transfer matrix methods for analysis.
Main Results:
- Achieved optimal confinement of visible light and GHz phonons in GaAlAs DBR structures.
- Experimental results show excellent agreement with transfer matrix method simulations.
- Demonstrated resonant behavior of the photoelastic coefficient.
Conclusions:
- The perfect overlap of optical and acoustic modes enhances coupling mechanisms.
- DBR-based cavities exhibit potential for highly efficient optomechanical resonator applications.
- This work paves the way for advanced optomechanical devices.
