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Updated: Jul 4, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
Total absorption of unpolarized light by crossed gratings
E Popov1, D Maystre, R C McPhedran
1Institut Fresnel, Aix-Marseille Université, CNRS, Domaine Universitaire de St Jérôme, case 161, 13397 Marseille Cedex 20, France.
Abstract:
We present both experimental and numerical data showing the absorption of unpolarized, normally incident light by a gold crossed grating having a shallow sinusoidal profile. We show furthermore that the total absorption of unpolarized light can be achieved for an angle of incidence of 30 degrees with a crossed grating having its period adjusted appropriately from the normal incidence case to preserve the plasmonic resonance responsible for the enhanced absorptance. We contrast the process for achieving high absorptance in the principal plane of incidence aligned with the grooves of one of the gratings, with that for the principal plane at 45 degrees to each grating.
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