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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 5 — Mar. 1, 2014
  • pp: 1137–1140

Optimized grating as an ultra-narrow band absorber or plasmonic sensor

Lijun Meng, Ding Zhao, Zhichao Ruan, Qiang Li, Yuanqing Yang, and Min Qiu  »View Author Affiliations

Optics Letters, Vol. 39, Issue 5, pp. 1137-1140 (2014)

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Lamellar gratings are investigated via temporal coupled-mode theory and numerical simulations. Total absorption can be achieved by an optimized grating with shallow grooves under normal incidence and the full width at half-maximum (FWHM) is only 0.4 nm. For certain wavelengths, the structure shows high absorption only within an ultra-narrow angle, which suggests that it can be used as a highly directional thermal emitter according to Kirchhoff’s law. Besides, the resonant wavelength is sensitive to the refractive index of the environmental dielectric. The large sensitivity (1400nm/RIU) and simultaneous small FWHM result in a huge figure-of-merit of 2300/RIU, which enables the structure to have great potential in plasmonic sensing.

© 2014 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(240.6680) Optics at surfaces : Surface plasmons
(230.4555) Optical devices : Coupled resonators
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Diffraction and Gratings

Original Manuscript: November 13, 2013
Revised Manuscript: January 7, 2014
Manuscript Accepted: January 10, 2014
Published: February 19, 2014

Lijun Meng, Ding Zhao, Zhichao Ruan, Qiang Li, Yuanqing Yang, and Min Qiu, "Optimized grating as an ultra-narrow band absorber or plasmonic sensor," Opt. Lett. 39, 1137-1140 (2014)

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