We present a symmetry-based theory of the depolarization induced by subwavelength metal hole arrays. We derive the Mueller matrices of hole arrays with various symmetries (in particular square and hexagonal) when illuminated by a finite-diameter (e.g., Gaussian) beam. The depolarization is due to a combination of two factors: (i) polarization-dependent propagation of surface plasmons along the surface of the array and (ii) a spread of wave vectors in the incident beam.
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Genet et al. (2005) studied this question.
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