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Highly-coherent second-harmonic generation in a chip-scale source.

Xuanyi Liu1, Hongyan Fu2

  • 1Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.

Light, Science & Applications
|January 17, 2024
PubMed
Summary
This summary is machine-generated.

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A novel silicon nitride microring resonator integrates a highly efficient second-harmonic source. This breakthrough enables advanced chip-scale devices like miniaturized atomic clocks and self-referenced microcombs.

Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Integrated Optics

Background:

  • Microring resonators are crucial for integrated photonic circuits.
  • Efficient on-chip harmonic generation is essential for advanced optical functionalities.
  • Silicon nitride offers excellent optical properties for photonic integration.

Purpose of the Study:

  • To integrate a highly efficient second-harmonic source into a silicon nitride microring resonator.
  • To demonstrate a compact and scalable platform for on-chip optical frequency conversion.
  • To enable next-generation chip-scale photonic devices.

Main Methods:

  • Fabrication of silicon nitride microring resonators.
  • Integration of a nonlinear optical element for second-harmonic generation.

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  • Characterization of the second-harmonic conversion efficiency and spectral properties.

    • Main Results:

    • Achieved highly efficient second-harmonic generation within the microring resonator.
    • Demonstrated the successful integration of the light source and resonator on a chip.
    • Validated the potential for miniaturized atomic clocks and self-referenced microcombs.

    Conclusions:

    • The integrated second-harmonic source in silicon nitride microring resonators represents a significant advancement in chip-scale photonics.
    • This technology paves the way for compact, high-performance optical systems.
    • Opens new avenues for applications in metrology, spectroscopy, and optical communications.