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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 31, Iss. 7 — Jul. 1, 2014
  • pp: 1653–1659

Transmittance of a subwavelength aperture flanked by a finite groove array placed near the focus of a conventional lens

F. Villate-Guío, F. de León-Pérez, and L. Martín-Moreno  »View Author Affiliations


JOSA B, Vol. 31, Issue 7, pp. 1653-1659 (2014)
http://dx.doi.org/10.1364/JOSAB.31.001653


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Abstract

In this paper, we study the optical response of 1D light harvesting structures that are illuminated by a conventional lens. Our theoretical study shows that high transmission efficiencies are obtained when the structure is placed near the focal plane of the lens. The considered structure is a finite slit-groove array (SGA) with a given number of grooves, which are symmetrically distributed with respect to a central slit. The SGA is nanopatterned on an opaque metallic film. It is found that a total transmittance of 80% is achieved even for a single slit when (1) Fabry–Perot-like modes are excited inside the slit and (2) the effective cross section of the aperture becomes of the order of the FWHM of the incident beam. A further enhancement of 8% is produced by the groove array. The optimal geometry for the groove array consists of a moderate number of grooves (4) at either side of the slit, separated by a distance of half the incident wavelength λ. Grooves should be deeper (with depth λ/4) than those typically reported for plane wave illumination in order to increase their individual scattering cross section.

© 2014 Optical Society of America

OCIS Codes
(160.3900) Materials : Metals
(240.6690) Optics at surfaces : Surface waves
(250.5403) Optoelectronics : Plasmonics
(050.6624) Diffraction and gratings : Subwavelength structures
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Diffraction and Gratings

History
Original Manuscript: April 9, 2014
Revised Manuscript: May 14, 2014
Manuscript Accepted: May 14, 2014
Published: June 23, 2014

Citation
F. Villate-Guío, F. de León-Pérez, and L. Martín-Moreno, "Transmittance of a subwavelength aperture flanked by a finite groove array placed near the focus of a conventional lens," J. Opt. Soc. Am. B 31, 1653-1659 (2014)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-31-7-1653


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