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Transition from electromagnetically-induced transparency to absorption in a single microresonator.

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    Area of Science:

    • Optics
    • Quantum Optics
    • Materials Science

    Background:

    • Electromagnetically induced transparency (EIT) and absorption (EIA) are quantum interference phenomena.
    • Whispering-gallery-mode (WGM) optical microresonators support light-matter interactions with high quality factors.
    • EIT-EIA transitions are crucial for developing advanced optical devices.

    Purpose of the Study:

    • To demonstrate the transition from EIT to EIA in a single WGM microresonator.
    • To investigate the tunability of this transition using mechanical deformation.
    • To explore the underlying physics related to coupled optical modes in microresonators.

    Main Methods:

    • Utilized a fiber taper for coupling light into a sausage-like microresonator (SLM).
    • Employed axial stretching of the SLM to tune the resonance frequencies of two coupled optical modes.
    • Analyzed transmission spectra to observe the EIT-EIA transition by adjusting the fiber taper proximity.

    Main Results:

    • Successfully observed the transition from EIT to EIA in the transmission spectra of the SLM.
    • Demonstrated that axial stretching of the SLM can tune the coupled modes into resonance.
    • Correlated the observed transition with the unique spatial distribution of optical modes within the SLM.

    Conclusions:

    • The study presents a novel method for observing and controlling EIT-EIA transitions in WGM microresonators.
    • The findings highlight the potential of deformable microresonators for tunable optical switching and sensing applications.
    • The spatial mode distribution in SLMs provides a theoretical foundation for understanding and manipulating these quantum interference effects.