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14 October 2011Enhanced transmission through metallic subwavelength slits
G. F. Camacho-Gonzalez,1 O. Olmos-Lopez,2 J. Sumaya-Martínez,3 M. Mayorga-Rojas1
1Univ. Autónoma del Estado de México (Mexico) 2Instituto Tecnológico y de Estudios Superiores de Monterrey (Mexico) 3Univ. Autonoma del Estado de Mexico (Mexico)
We present FDTD calculations for transmission of electromagnetic waves through periodic arrays of slits in a
metallic screen. The results show resonant, frequency dependent, transmittance peaks for subwavelength
widths of the slits which can be up to a factor of ten with respect to those out of resonance. Although our
conclusions agree with previous work by Lezec and Thio as regards both the magnitude of the enhancement
and the lack of contribution of surface plasmon polaritons of the metal surface to this effect, we derive an
interpretation from a theory that deals with emerging beam-Rayleigh anomalies of the grating, and with Fabry-
Perot resonances of the perforated screen considered as an effective medium.
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G. F. Camacho-Gonzalez, O. Olmos-Lopez, J. Sumaya-Martínez, M. Mayorga-Rojas, "Enhanced transmission through metallic subwavelength slits
," Proc. SPIE 8287, Eighth Symposium Optics in Industry, 82870T (14 October 2011); https://doi.org/10.1117/12.912917