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Abstract:

In the last few decades, special attention has been paid to the optical response of structures composed of periodic subwavelength slits in thin metallic sheets. Extraordinary transmission and evanescent-to-propagating conversion are two of the main effects that have been most investigated in these systems. In this paper, we present an alternative way of enhancing the intensity diffracted by a grating through morphological electromagnetic resonances. Unlike nanoslit arrays, in this system the cavities are formed by periodically distributed chains of metallic subwavelength cylinders, which behave like walls that confine the fields and thus show resonant behavior. The set of cavities is illuminated by an evanescent wave generated by total internal reflection. We show that resonant coupling of cavity modes excited by the inhomogeneous wave produces enhanced transmission of up to 92% and also that the system has the ability of steering most of the transmitted intensity in a particular direction given by the diffraction orders. The results are compared with those obtained from a similar structure formed by periodically distributed perfectly conducting solid walls. © 2017 Optical Society of America.

Registro:

Documento: Artículo
Título:Enhanced transmission via cavity modes in gratings formed by subwavelength metallic cylinders
Autor:Lester, M.; Skigin, D.C.
Filiación:Instituto de Física Arroyo Seco, IFAS (UNCPBA), CIFICEN (UNCPBA-CICPBA-CONICET), Grupo Óptica de Sólidos–Elfo, Pinto 399, Tandil, 7000, Argentina
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, Grupo de Electromagnetismo Aplicado, Buenos Aires, Argentina
CONICET, Universidad de Buenos Aires, Instituto de Física de Buenos Aires (IFIBA), Buenos Aires, Argentina
Palabras clave:Cylinders (shapes); Refractive index; Electromagnetic resonance; Enhanced transmission; Extraordinary transmission; Inhomogeneous waves; Resonant couplings; Subwavelength slits; Total internal reflections; Transmitted intensities; Diffraction gratings
Año:2017
Volumen:34
Número:12
Página de inicio:2624
Página de fin:2632
DOI: http://dx.doi.org/10.1364/JOSAB.34.002624
Título revista:Journal of the Optical Society of America B: Optical Physics
Título revista abreviado:J Opt Soc Am B
ISSN:07403224
CODEN:JOBPD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07403224_v34_n12_p2624_Lester

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Citas:

---------- APA ----------
Lester, M. & Skigin, D.C. (2017) . Enhanced transmission via cavity modes in gratings formed by subwavelength metallic cylinders. Journal of the Optical Society of America B: Optical Physics, 34(12), 2624-2632.
http://dx.doi.org/10.1364/JOSAB.34.002624
---------- CHICAGO ----------
Lester, M., Skigin, D.C. "Enhanced transmission via cavity modes in gratings formed by subwavelength metallic cylinders" . Journal of the Optical Society of America B: Optical Physics 34, no. 12 (2017) : 2624-2632.
http://dx.doi.org/10.1364/JOSAB.34.002624
---------- MLA ----------
Lester, M., Skigin, D.C. "Enhanced transmission via cavity modes in gratings formed by subwavelength metallic cylinders" . Journal of the Optical Society of America B: Optical Physics, vol. 34, no. 12, 2017, pp. 2624-2632.
http://dx.doi.org/10.1364/JOSAB.34.002624
---------- VANCOUVER ----------
Lester, M., Skigin, D.C. Enhanced transmission via cavity modes in gratings formed by subwavelength metallic cylinders. J Opt Soc Am B. 2017;34(12):2624-2632.
http://dx.doi.org/10.1364/JOSAB.34.002624