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    Area of Science:

    • Photonics
    • Condensed Matter Physics
    • Materials Science

    Background:

    • Topological corner states (TCSs) offer localized energy and defect immunity, crucial for advanced applications.
    • Existing TCS sensors are limited to single-function detection, hindering multifunctional capabilities.

    Purpose of the Study:

    • To develop a novel dual-function sensor leveraging TCSs for simultaneous detection of refractive index and temperature.
    • To demonstrate a new paradigm for multifunctional sensing using composite photonic structures.

    Main Methods:

    • Proposed a dual-function sensor utilizing TCSs within a composite photonic structure.
    • Achieved TCS excitation via near-field coupling assisted by topological edge states.
    • Employed dual-band TCSs to enable sensing of refractive index and temperature.

    Main Results:

    • The sensor exhibited wavelength shifts in response to changes in refractive index and temperature.
    • Achieved a salinity sensitivity of 0.04 THz/‰ and temperature sensitivity of 0.021 THz/°C.
    • Demonstrated the feasibility of multifunctional sensing with high sensitivity.

    Conclusions:

    • Established a new paradigm for multifunctional sensing using TCSs.
    • Paved the way for the development of ultra-compact on-chip nanophotonic devices.
    • Highlighted the potential of TCSs in advancing integrated photonic systems.