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This summary is machine-generated.

This study shows how competing mechanical modes in superconducting devices can switch the spacing of microwave frequency combs. This offers new control over comb generation for various applications.

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Area of Science:

  • Cavity electromechanics
  • Nonlinear optics
  • Superconducting devices

Background:

  • Cavity electromechanical devices with Kerr-like nonlinearity are key for microwave frequency comb generation.
  • Understanding the interplay of multiple mechanical modes is crucial for advanced comb control.

Purpose of the Study:

  • To investigate synergistic frequency comb generation using two mechanical modes in a silicon-nitride membrane based superconducting cavity electromechanical device.
  • To explore the hybridization and switching of frequency comb tooth spacing through mechanical mode competition.

Main Methods:

  • Construction of a silicon-nitride membrane based superconducting cavity electromechanical device.
  • Analysis of frequency combs generated around the threshold of intracavity field instability.
  • Observation of comb hybridization at the overlap boundaries of mechanical mode mediated instability thresholds.

Main Results:

  • Independent frequency combs with tooth spacing matching individual mechanical mode frequencies were observed.
  • Hybridized frequency combs with unequally spaced lines resulted from the indirect coupling between mechanical modes.
  • Switchability of frequency comb tooth spacing was demonstrated, dependent on mechanical mode competition.

Conclusions:

  • Mechanical mode competition enables switchable frequency comb tooth spacing in cavity electromechanical systems.
  • The findings can be extended to other devices exhibiting multiple nonlinearities.
  • This work provides a pathway for tunable microwave frequency comb generation.