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Threshold and Laser Conversion in Nanostructured-Resonator Parametric Oscillators.

Haixin Liu1,2, Grant M Brodnik1,2, Jizhao Zang1,2

  • 1Time and Frequency Division, National Institute of Standards and Technology, Boulder, Colorado, USA.

Physical Review Letters
|January 26, 2024
PubMed
Summary
This summary is machine-generated.

We demonstrate efficient optical parametric oscillation (OPO) in nanophotonic resonators using novel inner-wall modulation. This approach enables high laser-conversion efficiency and offers a path toward near-unity performance in integrated photonic circuits.

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Area of Science:

  • Photonics
  • Nonlinear Optics
  • Nanotechnology

Background:

  • Optical parametric oscillation (OPO) is a key nonlinear process for frequency conversion.
  • Nanophotonic resonators offer enhanced light-matter interactions for nonlinear optics.
  • Achieving efficient and tunable OPO in integrated platforms remains a challenge.

Purpose of the Study:

  • To explore OPO in nanophotonic resonators with engineered inner-wall modulation.
  • To achieve arbitrary, nonlinear phase matching and control energy conversion.
  • To investigate the impact of coherent backscattering on OPO performance.

Main Methods:

  • Utilizing nanostructured inner-wall modulation in resonators for universal phase matching.
  • Developing an analytical model to understand OPO threshold and conversion efficiency.
  • Conducting experiments with on-chip, nanostructured-resonator OPO circuits.

Main Results:

  • Demonstrated OPO laser-conversion circuits with (41±4)% efficiency and 40±4 mW on-chip power.
  • Identified the fundamental connection between OPO efficiency and resonator coupling rate.
  • Showcased a method to overcome limitations imposed by counterpropagating pump fields.

Conclusions:

  • Nanostructured resonators enable efficient and reconfigurable OPO laser-conversion.
  • The developed model provides insights for optimizing OPO performance.
  • A pathway toward near-unity OPO conversion efficiency in integrated photonics is established.