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    Coherent perfect absorption (CPA) requires equal light intensities from opposite ends. Nonlinear systems show discrete intensities and hysteresis for CPA, unlike linear systems.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nonlinear Optics

    Background:

    • Coherent perfect absorption (CPA) is a phenomenon where light is completely absorbed.
    • Investigating CPA in composite media is crucial for advanced optical applications.
    • Understanding the role of nonlinearity and illumination conditions is key.

    Purpose of the Study:

    • To investigate coherent perfect absorption (CPA) in a Kerr nonlinear metal-dielectric composite.
    • To determine the conditions necessary for achieving CPA under bidirectional illumination.
    • To explore the influence of light intensity and nonlinearity on CPA.

    Main Methods:

    • Symmetry considerations to establish prerequisites for CPA.
    • Derivation of sufficient conditions for CPA.
    • Analysis of linear and nonlinear systems under varying incident light intensities.
    • Unified formulation of CPA and waveguiding.

    Main Results:

    • Equality of incident light intensities is a prerequisite for CPA.
    • Nonlinear CPA exhibits discrete intensity requirements and hysteretic behavior.
    • CPA in linear systems is power-independent, unlike nonlinear systems.
    • CPA and waveguiding are identified as opposing scattering phenomena.

    Conclusions:

    • CPA in nonlinear composite media is achievable under specific, discrete intensity conditions.
    • Nonlinearity introduces power-dependent effects and hysteresis in CPA.
    • The study provides a unified framework for understanding CPA and waveguiding.