High frequency optomechanical disk resonators in III-V ternary semiconductors

Area of Science:

• Optomechanics
• Nanophotonics
• Semiconductor Physics

Background:

• Optomechanical systems are crucial for precision motion measurement, quantum control, and nanomechanical sensing.
• III-V semiconductors offer unique advantages for optomechanics, including heteroepitaxial growth of metamaterials for enhanced photon/phonon interactions.
• Gallium arsenide (GaAs) shows high performance but is limited by two-photon absorption (TPA) at telecom wavelengths, impacting cooperativity.

Purpose of the Study:

• Investigate TPA-free III-V semiconductor materials for advanced optomechanics applications.
• Evaluate In0.5Ga0.5P and Al0.4Ga0.6As as alternatives to GaAs for optomechanical devices.
• Characterize the optical and mechanical properties of novel optomechanical disk resonators.

Main Methods:

• Fabrication of optomechanical disks using In0.5Ga0.5P and Al0.4Ga0.6As.
• Optical and mechanical characterization of fabricated devices under ambient conditions.
• Demonstration of laser-sustained optomechanical self-oscillation in the new materials.

Main Results:

• Successfully fabricated high-frequency (500-700 MHz) optomechanical disks from In0.5Ga0.5P and Al0.4Ga0.6As.
• Achieved high optical and mechanical quality factors (Q) in ambient conditions for both materials.
• Demonstrated the operation of these new materials as laser-sustained optomechanical self-oscillators.

Conclusions:

• In0.5Ga0.5P and Al0.4Ga0.6As are promising TPA-free alternatives to GaAs for optomechanics.
• These materials exhibit excellent optical and mechanical properties suitable for high-performance optomechanical systems.
• The study provides a comparative analysis with existing GaAs systems, paving the way for next-generation optomechanical devices.