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Tunable Exciton-Driven Photoelasticity in 2D Material Acoustic Cavities
Jeremy T Robinson1, Maxim K Zalalutdinov1, Cory D Cress1
1US Naval Research Laboratory, Washington, DC 20375, United States.
ACS Nano
|March 7, 2025
Summary
Researchers controlled light-matter interactions in 2D materials using temperature and photon polarization. This enables tunable optical readout for advanced acoustic devices, potentially exceeding 100 MHz switching rates.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Coupling optical, electronic, and mechanical domains is key for high-frequency acoustic devices.
- Tunable coupling materials can significantly expand device functionality.
Purpose of the Study:
- To demonstrate control over light-matter interactions in 2D semiconducting cavities.
- To engineer optical readout for enhanced acoustic device functionality.
Main Methods:
- Utilized temperature-induced electronic bandgap shift (EBS) in WSe2 cavities.
- Explored photon polarization control in birefringent ReS2 cavities.
- Performed Density Functional Theory (DFT) calculations for deformation potential (DP).
Main Results:
- Demonstrated temperature-driven EBS to tune WSe2 cavity readout by sweeping excitonic energy.
- Achieved amplitude and phase modulation of optical readout, suggesting switching rates over 100 MHz.
- Showcased multiexciton control in ReS2 for signal modulation at lower temperatures.
- DFT confirmed significant out-of-plane strain-driven DP in WSe2 and ReS2.
Conclusions:
- Temperature and photon polarization offer effective methods to control light-phonon interactions in 2D materials.
- The demonstrated approach allows for engineering optical transduction of acoustic vibrations.
- The methodology for quantifying out-of-plane DP can be extended to heterostructures for advanced device design.
