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Related Experiment Video

Updated: Jun 13, 2025

Construction of Microdrive Arrays for Chronic Neural Recordings in Awake Behaving Mice
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Foundry manufacturing of octave-spanning microcombs.

Jizhao Zang, Haixin Liu, Travis C Briles

    Optics Letters
    |September 13, 2024
    PubMed
    Summary

    We developed chip-based soliton microcombs for optical metrology. These devices enable octave-spanning spectra for precise measurements, offering a repeatable, compact solution for advanced applications.

    Area of Science:

    • Integrated Photonics
    • Nonlinear Optics
    • Optical Metrology

    Background:

    • Soliton microcombs offer chip-based, octave-spanning light sources.
    • These sources are crucial for self-referencing and optical metrology applications.
    • Existing methods require complex setups, limiting miniaturization.

    Purpose of the Study:

    • To design and fabricate highly repeatable, single-chip octave-spanning soliton microcombs.
    • To optimize microcombs for f-2f self-referencing and optical metrology.
    • To demonstrate a compact microsystem for optical measurements.

    Main Methods:

    • Utilizing silicon nitride integrated photonics foundry for microcomb fabrication.
    • Employing group-velocity dispersion (GVD) engineering via waveguide cross-section modification.

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  • Systematic scanning of resonator parameters (width, radius) to ensure fabrication tolerance.

    • Main Results:

    • Manufactured 280 single-chip octave-spanning microcombs on a wafer.
    • Achieved dispersive-wave spectral enhancements for f-2f self-referencing.
    • Demonstrated repeatable creation of microcombs with electronically detectable carrier-envelope offset frequency.

    Conclusions:

    • The developed soliton microcombs are optimized for low pump power (~100 mW) and high comb mode power.
    • This work enables the creation of compact microsystems for optical metrology.
    • The fabrication process ensures high repeatability and performance for self-referencing applications.