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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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NEMS generated electromechanical frequency combs.

Sasan Rahmanian1, Hamza Mouharrar2, Rana Abdelrahman1

  • 1Department of Systems Design Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, Canada.

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|January 15, 2025
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Summary
This summary is machine-generated.

This study introduces a new method for generating wide-range, low-power frequency combs (FC) using micro-electro-mechanical systems (NEMS). The technique offers superior bandwidth, stability, and phase coherence, paving the way for portable frequency comb generators.

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Area of Science:

  • Micro- and Nano-Electro-Mechanical Systems (NEMS)
  • Photonics and Optical Sciences
  • Resonant Systems Engineering

Background:

  • Frequency combs (FC) are crucial for precise frequency measurements and signal generation.
  • Existing FC generation methods often require complex setups and high power consumption.
  • There is a need for compact, low-power, and stable FC sources.

Purpose of the Study:

  • To present a novel, low-power technique for generating wide-range frequency combs.
  • To demonstrate the feasibility of using modal interactions in electrostatic NEMS for FC generation.
  • To compare the performance of different modal interactions for FC generation.

Main Methods:

  • Utilizing modal interactions between electrical and mechanical resonators in electrostatic NEMS.
  • Driving an electrical resonator at resonance, matched to a submultiple of the mechanical resonator's resonance.
  • Operating the NEMS device in ambient air for a simplified architecture.
  • Analyzing NEMS displacement to identify equidistant peaks characteristic of FCs.

Main Results:

  • Generation of FCs with over 150 equidistant peaks (2:1 modal interaction) and over 60 peaks (1:1 modal interaction).
  • Observed Free Spectral Range (FSR) equal to the mechanical resonance frequency in both interaction cases.
  • Demonstrated superior bandwidth, stability, and phase coherence for the 2:1 modal interaction compared to the 1:1 interaction.
  • Showcased flexibility in generating multiple FCs and fine-tuning FSR.

Conclusions:

  • The proposed NEMS-based technique offers a simple, low-power, and effective method for generating frequency combs.
  • The 2:1 modal interaction provides superior performance in terms of bandwidth, stability, and phase coherence.
  • The technology is suitable for integration into portable devices, aligning with miniaturization trends.