Diffraction of light by a bigrating: Surface polariton resonances and electric field enhancements
- 15 April 1983
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 27 (8) , 5150-5153
- https://doi.org/10.1103/physrevb.27.5150
Abstract
We present a theory of the diffraction of light of arbitrary polarization incident on a doubly periodic dielectric grating. We use Rayleigh's method together with the vectorial equivalent of Kirchhoff's integral. The amplitudes of the diffracted spectral orders are calculated for a sinusoidal bigrating and for a square lattice of hemiellipsoids on a flat surface, for Ag. The enhancement of the electric field on and near the surface is calculated and is found to reach values of about 300.Keywords
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