The authors introduce a new scattering phenomenon called coherent orthogonal scattering, where the output wave becomes orthogonal to the reference output wave in the absence of scatterers. This effect leads to complete extinction and complete mode conversion. The authors further examine the conditions for this effect and reveal its topological nature by relating it to the indivisibility between the dimension and the winding number of scattering submatrices.
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Guo et al. (2024) studied this question.
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