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Optomechanical Frequency Comb Based on Multiple Nonlinear Dynamics.

Yu Wang1, Mai Zhang1, Zhen Shen1

  • 1CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China; CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230088, China; and Hefei National Laboratory, University of Science and Technology of China, Hefei, Anhui 230088, China.

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Summary
This summary is machine-generated.

Researchers demonstrate a novel silicon optomechanical frequency comb. This device exhibits complex mode competition and frequency-locking, offering a new tool for sensing and metrology.

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Area of Science:

  • Optomechanics
  • Solid-state physics
  • Photonics

Background:

  • Phonon-based frequency combs offer simple setups and small repetition rates.
  • Optomechanical crystal cavities are promising for generating such combs.

Purpose of the Study:

  • To experimentally demonstrate a new type of phonon-based frequency comb in a silicon optomechanical crystal cavity.
  • To investigate the phenomenon of mode competition and frequency-locking in this system.

Main Methods:

  • Experimental demonstration using a silicon optomechanical crystal cavity.
  • Observation of lasing from breathing and flexural mechanical modes.
  • Theoretical formulation to explain observed phenomena.

Main Results:

  • Simultaneous lasing of a breathing mechanical mode (GHz) and flexural modes (MHz).
  • Strong mode competition between two flexural modes (77.19 and 90.17 MHz) leading to single preponderant lasing.
  • Frequency-locking of the comb's repetition rate to fractions of a flexural mode frequency due to self-pulsing effects.
  • Generation of a phonon-based frequency comb with at least 260 comblines.

Conclusions:

  • The study presents a novel optomechanical frequency comb with unique mode competition dynamics.
  • Theoretical models successfully explain the counterintuitive simultaneous lasing and mode competition.
  • This work provides an alternative optomechanical frequency comb for advanced applications in sensing, timing, and metrology.