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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 14 — Jul. 15, 2013
  • pp: 16455–16465

Design and analysis of perfect terahertz metamaterial absorber by a novel dynamic circuit model

Mohammad Parvinnezhad Hokmabadi, David S. Wilbert, Patrick Kung, and Seongsin M. Kim  »View Author Affiliations


Optics Express, Vol. 21, Issue 14, pp. 16455-16465 (2013)
http://dx.doi.org/10.1364/OE.21.016455


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Abstract

Metamaterial terahertz absorbers composed of a frequency selective layer followed by a spacer and a metallic backplane have recently attracted great attention as a device to detect terahertz radiation. In this work, we present a quasistatic dynamic circuit model that can decently describe operational principle of metamaterial terahertz absorbers based on interference theory of reflected waves. The model comprises two series LC resonance components, one for resonance in frequency selective surface (FSS) and another for resonance inside the spacer. Absorption frequency is dominantly determined by the LC of FSS while the spacer LC changes slightly the magnitude and frequency of absorption. This model fits perfectly for both simulated and experimental data. By using this model, we study our designed absorber and we analyze the effect of changing in spacer thickness and metal conductivity on absorption spectrum.

© 2013 OSA

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(260.5740) Physical optics : Resonance
(040.2235) Detectors : Far infrared or terahertz
(160.3918) Materials : Metamaterials
(050.6624) Diffraction and gratings : Subwavelength structures
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Metamaterials

History
Original Manuscript: April 22, 2013
Revised Manuscript: June 23, 2013
Manuscript Accepted: June 24, 2013
Published: July 2, 2013

Citation
Mohammad Parvinnezhad Hokmabadi, David S. Wilbert, Patrick Kung, and Seongsin M. Kim, "Design and analysis of perfect terahertz metamaterial absorber by a novel dynamic circuit model," Opt. Express 21, 16455-16465 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-14-16455


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