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Summary
This summary is machine-generated.

This study introduces a new method for controlling wave scattering using quasinormal modes (QNMs). It reveals a geometric phase in QNMs that allows for precise manipulation of scattering intensity and polarization.

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Area of Science:

  • Wave physics
  • Photonics
  • Electromagnetism

Background:

  • Conventional scattering manipulation relies on multipole expansion, which is origin-dependent and descriptive rather than predictive.
  • Quasinormal modes (QNMs) offer an alternative framework for understanding wave scattering phenomena.

Purpose of the Study:

  • To explore scattering manipulation through controlled excitation and interference of QNMs.
  • To develop a predictive framework for scattering control based on QNM properties.

Main Methods:

  • Scattered waves are expanded into coherent additions of QNMs.
  • Electromagnetic reciprocity is used to derive geometric representations on the Poincaré sphere.
  • The geometric phase of QNMs is identified and analyzed.

Main Results:

  • A hidden geometric phase of QNMs is discovered, driving scattering evolution.
  • Synchronous control of incident polarization-dependent geometric phase and excitation amplitudes enables manipulation of scattering.
  • Continuous 2π geometric phase variations are observed in scattering.

Conclusions:

  • A comprehensive framework for calculating geometric phase in reciprocal scattering systems is established.
  • This approach offers significant advancements for photonics and general wave physics.
  • The findings enable precise control over scattering intensity and polarization.