Depolarization induced by subwavelength metal hole arrays
Cyriaque Genet, Erwin Altewischer, Martin P. van Exter, J.P., Woerdman
TL;DR
This paper develops a symmetry-based theoretical framework to understand how subwavelength metal hole arrays cause depolarization of light, considering surface plasmon propagation and incident beam wave vector spread.
Contribution
It introduces a Mueller matrix model for various symmetric hole arrays, linking depolarization effects to surface plasmons and beam properties.
Findings
Mueller matrices derived for square and hexagonal arrays
Depolarization explained by surface plasmon propagation
Beam wave vector spread contributes to depolarization
Abstract
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) propagation of surface plasmons along the surface of the array, (ii) a spread of wave vectors in the incident beam.
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Taxonomy
TopicsOptical Coatings and Gratings · Optical Polarization and Ellipsometry · Surface Roughness and Optical Measurements