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Area of Science:

  • Photonics
  • Optical Sensing
  • Nonlinear Optics

Background:

  • Photonic microring resonators are crucial for chip-integrated sensing.
  • Their sensitivity is limited by the Q factor and linear scaling.
  • External signals modulate transmission intensity.

Purpose of the Study:

  • To enhance the sensitivity of photonic microring resonators.
  • To leverage nonlinear self-phase-modulation for increased sensitivity.
  • To demonstrate a significant gain factor in a proof-of-concept experiment.

Main Methods:

  • Exploiting the nonlinear self-phase-modulation effect.
  • Operating the nonlinear resonator at the monostable-bistable regime crossover.
  • Utilizing chip-integrated silicon-nitride resonators.

Main Results:

  • Achieved an additional gain factor in sensitivity.
  • Demonstrated a gain factor of 22 in a proof-of-concept experiment.
  • Validated the theoretical concept with experimental data.

Conclusions:

  • Nonlinear self-phase-modulation offers a pathway to significantly boost resonator sensitivity.
  • The proposed method provides a substantial improvement over traditional linear scaling.
  • This technique holds promise for advancing chip-integrated sensing technologies.