Journal
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
Volume 4, Issue 5, Pages S83-S87Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1464-4258/4/5/351
Keywords
diffraction; electromagnetic theory; crossed gratings
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The extraordinary optical transmission of a metallic film pierced by a two-dimensional subwavelength hole array, observed by Ebbesen et al, is explained using rigorous electromagnetic analysis and a phenomenological approach. The analysis is based on Li's Fourier-modal method extended to crossed gratings, which reduces the diffraction problem to the search for eigenvalues and eigenvectors of a particular matrix. The computation of the eigenvalues allows us to find a new channel for light transmission through the subwavelength holes, which differs from the transmission channel in the one-dimensional case (lamellar or rectangular-rod grating). It is demonstrated that the enhanced transmission is due to the excitation of a surface plasmon on the lower metallic surface.
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