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  • Gender:

    Male

  • Discipline:

    Acoustics. Optics. Condensed Matter Physics

  • Education Level:

    With Certificate of Graduation for Doctorate Study

  • Discipline:

    1 Acoustics;
    1 Optics;
    1 Condensed Matter Physics

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Publications

Current position: English > Research > Publications

Singular topology of scattering matrices

  • Time:2024-04-28
  • Hits:

  • Journal:

    PHYSICAL REVIEW B

  • Abstract:

    We present a systematic topological theory of the scattering matrix and its submatrices, focusing on the singular values and vectors. We study the topological properties of the scattering matrix in the parameter space and determine a set of topological characteristics for a general system, including the winding number, Berry phase, and skew polarization. We reveal unique topological effects for a reciprocal system such as quantized
     single-band polarization and Z2 topology of Takagi vectors. Applying our theory, we reveal the topological nature of two phenomena: the well-known effect of coherent perfect absorption and a new effect we call coherent perfect extinction. Coherent perfect extinction refers to the complete extinction of light due to interference of multiple incident waves. It accounts for both absorption and scattering losses and encompasses many other
    known effects such as complete polarization conversion and reflectionless scattering modes, providing a unifying theme for these phenomena. Our analysis highlights the topological nature of these effects and provides criteria to localize their occurrence in parameter space, facilitating optical design to achieve these effects. We propose utilizing coherent perfect extinction for multichannel background-free sensing. These findings significantly advance our understanding of scattering phenomena and have important implications for the development of novel optical devices.

  • Indexed by:

    Journal paper

  • Volume:

    108

  • Issue:

    15

  • Page Number:

    155418

  • Translation or Not:

    no

  • Date of Publication:

    2023-10-17

  • Links to published journals:

    https://journals.aps.org/prb/abstract/10.1103/PhysRevB.108.155418

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