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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 23 — Nov. 5, 2012
  • pp: 26012–26020

On metamaterial circular polarizers based on metal N-helices

Johannes Kaschke, Justyna K. Gansel, and Martin Wegener  »View Author Affiliations


Optics Express, Vol. 20, Issue 23, pp. 26012-26020 (2012)
http://dx.doi.org/10.1364/OE.20.026012


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Abstract

Metal-helix based metamaterials have been introduced as compact and broadband circular polarizers. However, the end of the metal wire together with the helix center defines an axis in space, which unavoidably breaks the rotational symmetry at the metamaterial surface. This introduces linear birefringence. Symmetry can be recovered by considering an integer number, e.g. N = 4, of intertwined helices arranged to a square array. We show that the operation principles are fundamentally different though. Metamaterial circular polarizers based on N = 4 helices, unlike single helices, inherently require absorption of the constituent metal. Otherwise, the combination of a four-fold rotational axis and time-inversion symmetry strictly forbids circular-polarizer action. Our symmetry analysis is confirmed by extensive numerical calculations comparing results for perfect electric conductors with those for a free-electron Drude metal with finite damping.

© 2012 OSA

OCIS Codes
(260.5430) Physical optics : Polarization
(160.1585) Materials : Chiral media
(160.3918) Materials : Metamaterials

ToC Category:
Metamaterials

History
Original Manuscript: August 9, 2012
Revised Manuscript: September 27, 2012
Manuscript Accepted: September 28, 2012
Published: November 2, 2012

Citation
Johannes Kaschke, Justyna K. Gansel, and Martin Wegener, "On metamaterial circular polarizers based on metal N-helices," Opt. Express 20, 26012-26020 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-23-26012


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References

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