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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 10 — May. 19, 2014
  • pp: 11633–11645

Symmetry-reduced double layer metallic grating structure for dual-wavelength spectral filtering

Yuzhang Liang, Wei Peng, Rui Hu, and Mengdi Lu  »View Author Affiliations

Optics Express, Vol. 22, Issue 10, pp. 11633-11645 (2014)

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In this paper, we propose a metal-dielectric dual-wavelength spectral filtering structure based on symmetry-reduced double layer metallic gratings (SRDMG) coupled to a guided-mode dielectric resonator. The grating symmetry is reduced by alternatively shifting metal nanowires of the top layer metallic grating. Compared to a symmetric double layer metallic grating that usually provides one resonance dip, this SRDMG structure generates two remarkable narrow band transmission dips with a transmission peak in-between at normal incidence. The appearance of the two narrowband resonance dips is attributed to the excitation of different current modes in the metallic grating, leading to different guided mode resonances in the dielectric layer, which is induced by the structural symmetry breaking. Moreover, these two guided modes do not split under oblique incidence and a flat dispersion band over a small angular range can be obtained. The positions of two dips and the frequency gap between them can be controlled by adjusting the thickness of metallic grating without the need to modify the structure period and width, which is an easy method to tune resonance position and bandwidth, and make the fabrication of some filters more convenient. This work can be used to develop subwavelength metallic-grating-based multi-wavelength and narrow-band spectral filters.

© 2014 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(230.7370) Optical devices : Waveguides
(260.3910) Physical optics : Metal optics
(130.7408) Integrated optics : Wavelength filtering devices

ToC Category:
Diffraction and Gratings

Original Manuscript: March 11, 2014
Revised Manuscript: April 21, 2014
Manuscript Accepted: April 28, 2014
Published: May 6, 2014

Yuzhang Liang, Wei Peng, Rui Hu, and Mengdi Lu, "Symmetry-reduced double layer metallic grating structure for dual-wavelength spectral filtering," Opt. Express 22, 11633-11645 (2014)

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