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Updated: Feb 9, 2026

Fabrication of Surface Acoustic Wave Devices on Lithium Niobate
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Published on: June 18, 2020

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High-Q chaotic lithium niobate microdisk cavity.

Li Wang, Cheng Wang, Jie Wang

    Optics Letters
    |June 16, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed novel chaotic lithium niobate (LN) microcavities. These devices overcome coupling challenges for high-Q resonators, enhancing applications in photonics and sensing.

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    Area of Science:

    • Optoelectronics
    • Nonlinear Optics
    • Quantum Photonics

    Background:

    • High quality (Q) factor lithium niobate (LN) microresonators are crucial for optoelectronics, optical communications, quantum photonics, and sensing.
    • Traditional evanescent coupling methods for LN microresonators face challenges in achieving simultaneous high pump and signal light coupling efficiencies.
    • These limitations hinder the practical application of high-Q factor LN resonators.

    Purpose of the Study:

    • To demonstrate deformed chaotic LN microcavities that achieve high Q factors and directional emission simultaneously.
    • To overcome the phase-matching limitations of traditional coupling methods.
    • To enhance the efficiency of free-space coupling for LN microresonator devices.

    Main Methods:

    • Fabrication of chaotic LN microdisks using conventional semiconductor processes.
    • Characterization of microcavity quality factors (Q factors) in the telecommunication band.
    • Leveraging directional emission from asymmetric cavities for efficient free-space coupling.

    Main Results:

    • Demonstrated chaotic LN microcavities with measured Q factors exceeding 10^6 in the telecommunication band.
    • Achieved efficient free-space coupling by utilizing directional emission patterns from the asymmetric cavities.
    • Showcased a 58-fold enhancement in free-space collection efficiency for second harmonic generation (SHG) signal compared to a circular microdisk.

    Conclusions:

    • Deformed chaotic LN microcavities offer a promising solution for efficient light coupling in high-Q resonators.
    • These novel microcavities enable broadband, high-efficiency free-space coupling, overcoming limitations of traditional methods.
    • The demonstrated enhancement in SHG signal collection efficiency highlights the potential of chaotic LN microcavities for advanced photonic applications.