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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 16 — Aug. 11, 2014
  • pp: 19484–19494

Extraordinary optical properties in the subwavelength metallodielectric free-standing grating

Yuzhang Liang, Wei Peng, Rui Hu, and Lingxiao Xie  »View Author Affiliations

Optics Express, Vol. 22, Issue 16, pp. 19484-19494 (2014)

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In this paper, we present a free-standing metallodielectric grating structure that can achieve multiple transmission dips and peaks at normal incidence over the visible spectrum. The amount of dips and peaks can be adjusted by the thickness of dielectric film. In our proposed structure, there are three types of resonance modes supported: Surface plasmon polarition (SPP) at horizontal metal/dielectric interface, vertical cavity mode in the metal slits, and guide mode in the dielectric film. Physically the coupling and resonant interactions among these modes lead to the generation of dips and peaks in the transmission spectrum. The transmission peaks is further interpreted by using Fano resonance. More surprisingly, the simultaneous excitation of three types of resonance modes can enhance the field distribution, which results in unexpected nearly perfect absorption in such simple structure. Moreover, compared to other absorption peaks, this high absorption peak originates from that guide mode resonance in the dielectric film inhibits transmission induced by cavity mode resonance in the metal slits. These results can be used in the design of many photonics components.

© 2014 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(310.2790) Thin films : Guided waves
(350.2450) Other areas of optics : Filters, absorption
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Diffraction and Gratings

Original Manuscript: June 4, 2014
Revised Manuscript: July 7, 2014
Manuscript Accepted: July 21, 2014
Published: August 5, 2014

Yuzhang Liang, Wei Peng, Rui Hu, and Lingxiao Xie, "Extraordinary optical properties in the subwavelength metallodielectric free-standing grating," Opt. Express 22, 19484-19494 (2014)

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