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    Area of Science:

    • Photonics
    • Condensed Matter Physics
    • Materials Science

    Background:

    • Non-Hermitian systems demonstrate exceptional sensitivity to perturbations when operating at exceptional points (EPs).
    • Existing EP-based systems often face challenges in achieving robust and tunable sensing capabilities.

    Purpose of the Study:

    • To propose and theoretically investigate a novel multilayered heterostructure designed to exhibit double exceptional points (EPs).
    • To demonstrate the potential of this heterostructure for sensitive optical sensing by exploiting its response to environmental fluctuations.

    Main Methods:

    • Theoretical investigation of a multilayered heterostructure.
    • Analysis of system parameters leading to vanishing forward- and backward-reflection coefficients at double EPs.
    • Modeling the scattering of light due to parameter perturbations (temperature, mechanical stress).

    Main Results:

    • The proposed heterostructure supports double EPs for specific material parameters.
    • Perturbations in system parameters, such as temperature and mechanical stress, cause the heterostructure to scatter light.
    • The optical response can be manipulated for sensing two independent parameters.

    Conclusions:

    • The developed double EP heterostructure offers a promising platform for advanced optical sensing.
    • This design enables sensitive detection of environmental changes through light scattering.
    • The ability to tune optical responses for independent parameter sensing highlights its potential in various applications.