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High-Q Trampoline Resonators from Strained Crystalline InGaP for Integrated Free-Space Optomechanics
Sushanth Kini Manjeshwar1, Anastasiia Ciers1, Fia Hellman1
1Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
Nano Letters
|May 26, 2023
Summary
Researchers developed novel nanomechanical resonators using tensile-strained InGaP, achieving ultra-low mechanical dissipation. These devices, ideal for optomechanics, demonstrate high mechanical quality factors and efficient light transduction.
Area of Science:
- Materials Science
- Nanotechnology
- Optomechanics
Background:
- Nanomechanical resonators require ultralow dissipation for advanced applications.
- Tensile-strained materials offer potential for high-performance resonators.
- Epitaxial growth enables integration into complex heterostructures.
Purpose of the Study:
- To demonstrate nanomechanical string and trampoline resonators using tensile-strained InGaP.
- To characterize the mechanical properties and performance of these resonators.
- To explore their potential for monolithic free-space optomechanical devices.
Main Methods:
- Epitaxial growth of InGaP on an AlGaAs heterostructure.
- Fabrication of nanomechanical string and trampoline resonators.
- Characterization of mechanical properties including stress, yield strength, and quality factor.
- Photonic crystal patterning for enhanced optical reflectivity.
Main Results:
- Demonstrated nanomechanical resonators from tensile-strained InGaP.
- Achieved mechanical quality factors exceeding 10^7 at room temperature.
- Reached a Q·f product as high as 7 × 10^11 Hz with trampoline resonators.
- Observed degradation of the intrinsic quality factor over time.
Conclusions:
- Tensile-strained InGaP is a promising material for high-performance nanomechanical resonators.
- Trampoline resonators with photonic crystals enable efficient optomechanical transduction.
- Further research is needed to address the observed degradation of mechanical quality factor.
