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    Area of Science:

    • Photonics
    • Quantum Optics
    • Optical Engineering

    Background:

    • Quantum mechanics shows transmission amplitude approaches unity at resonance in symmetric double-barrier structures.
    • Similar phenomena occur in optics with light coupling between waveguides via microresonators (e.g., ring, photonic crystal, toroidal, bottle).
    • Existing microresonators lack fine-tuning capabilities or present challenges in predictable coupling adjustments due to mode separation issues.

    Purpose of the Study:

    • To experimentally demonstrate a novel four-port micro-device for controlled optical resonance.
    • To address the limitations of fixed or difficult-to-tune microresonators in optical coupling applications.
    • To enable precise achievement of the resonance condition for enhanced light transmission.

    Main Methods:

    • Fabrication and characterization of a four-port micro-device utilizing a SNAP (Surface-coupled Nanostructured All-dielectric Photonic) microresonator on an optical fiber.
    • Measurement of spectrograms along the fiber to identify eigenmodes and eigenwavelengths for both polarization states.
    • Precise positioning of input-output microfiber tapers guided by identified resonant wavelengths and mode characteristics.

    Main Results:

    • Clear identification of SNAP microresonator eigenmodes and eigenwavelengths for both polarizations.
    • Demonstration of precise control over resonant wavelength selection.
    • Simultaneous determination of optimal microfiber taper positions for achieving the resonance condition.

    Conclusions:

    • The demonstrated SNAP microresonator device offers a tunable platform for achieving optical resonance.
    • This approach overcomes the limitations of non-tunable or difficult-to-align microresonator systems.
    • The device enables predictable and fine-tuned optical coupling for advanced photonic applications.