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Chip-Scale Optomechanical Frequency Comb with a 1-70 GHz Span.
Xirui Gou1, William Privratsky1, Wenhan Sun1
1Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States.
Nano Letters
|December 12, 2025
Summary
Researchers developed a record-broadband optomechanical frequency comb using a silicon carbide microdisk. This ultracompact device generates phase-locked harmonics from 1 to 70 GHz, enabling diverse applications.
Area of Science:
- Optomechanics
- Nonlinear Optics
- Microcavity Devices
Background:
- Optomechanical frequency combs link optical and mechanical modes.
- Previous combs had limited spectral range due to low mechanical frequencies.
Purpose of the Study:
- To achieve a record modulation span in optomechanical frequency combs.
- To harness strong optomechanical nonlinearity for broader bandwidth.
Main Methods:
- Utilized a 2.5-μm-radius silicon carbide microdisk.
- Employed a continuous-wave pump to drive phonon lasing via radiation pressure.
- Achieved phase-locking of harmonics.
Main Results:
- Demonstrated an optomechanical comb with a 1 to 70 GHz modulation span.
- Generated 42 phase-locked harmonics with 1.655 GHz spacing.
- Achieved low phase noise (-132 dBc/Hz) and high frequency stability (<10^-7).
Conclusions:
- The ultracompact optomechanical comb offers a broad bandwidth and excellent stability.
- This platform is suitable for diverse applications in the microwave domain and beyond.
