26 December 2001 Subwavelength hole array enhanced light transmission
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An electromagnetic analysis of a two-dimensional metallic grating is used to explain the extraordinary optical transmission of a metallic film pierced by a two-dimensional subwavelength hole array, observed three years ago. The analysis is based on the Fourier-modal method extended to crossed gratings, which reduces the diffraction problem to the search of eigenvalues and eigenvectors of a particular matrix. The computation of the eigenvalues allows finding 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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Stefan Enoch, Stefan Enoch, Evgueni K. Popov, Evgueni K. Popov, Michel Neviere, Michel Neviere, Raymond Reinisch, Raymond Reinisch, } "Subwavelength hole array enhanced light transmission", Proc. SPIE 4438, Physics, Theory, and Applications of Periodic Structures in Optics, (26 December 2001); doi: 10.1117/12.451480; https://doi.org/10.1117/12.451480

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