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    Area of Science:

    • Photonics and optical communication
    • Materials science
    • Nanotechnology

    Background:

    • Efficient optical signal modulation is crucial for advanced optical communication.
    • Current electro-optical modulators face challenges in achieving high modulation depth at CMOS-compatible voltages.
    • Electro-optical metasurfaces offer a promising solution for free-space optical modulation.

    Purpose of the Study:

    • To design and demonstrate an ultrahigh-Q electro-optical metasurface for efficient optical signal modulation.
    • To address the limitations of existing electro-optical modulators regarding modulation depth and voltage compatibility.
    • To explore the potential of bound states in the continuum (BIC) theory for enhancing metasurface performance.

    Main Methods:

    • Designed a BaTiO3 (BTO) electro-optical metasurface with a periodic array of rectangular grooves.
    • Utilized bound states in the continuum (BIC) theory to achieve an ultrahigh-Q quasi-BIC (Q-BIC) at 1550 nm by breaking in-plane symmetry.
    • Employed multipole decomposition to analyze the dominant resonance modes.

    Main Results:

    • Achieved an ultrahigh-Q factor of 2.87 × 10^5 for the quasi-BIC resonance.
    • Demonstrated the capability for 100% optical signal modulation depth in free space.
    • Identified toroidal dipole (TD) as the dominant multipole contribution to the Q-BIC resonance.
    • The metasurface's concave groove structure facilitated efficient voltage application.

    Conclusions:

    • The developed BTO electro-optical metasurface provides a feasible solution for achieving high modulation depth and efficient optical signal modulation.
    • The design leverages BIC theory and specific structural modifications to overcome previous limitations.
    • This work advances the development of faster and deeper electro-optical modulation for optical communication applications.