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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 26 — Dec. 20, 2010
  • pp: 27371–27386

Role of structural electromagnetic resonances in a steerable left-handed antenna

Kazuaki Sakoda and Haifeng Zhou  »View Author Affiliations


Optics Express, Vol. 18, Issue 26, pp. 27371-27386 (2010)
http://dx.doi.org/10.1364/OE.18.027371


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Abstract

We reformulate the problem of a steerable left-handed antenna reported by Matsuzawa et al. [IEICE Trans. Electron. E89-C, 1337 (2006)] from the view point of structural electromagnetic resonance of the unit structure. We show that there are two such resonances with different spatial symmetries in the relevant frequency range, which result in the formation of two electromagnetic bands with opposite signs of curvature at the Γ point of the Brillouin zone. We derive an expression of dispersion curves based on the tight-binding picture and show that the dispersion of the two bands is linear in the vicinity of the Γ point in the case of accidental degeneracy only if the symmetry of the two resonance states satisfies certain conditions. We also show that the refraction angle can be designed by changing the lattice constant of the arrayed unit structures, since the band width is modified due to the change in the electromagnetic transfer integral.

© 2010 Optical Society of America

OCIS Codes
(280.5600) Remote sensing and sensors : Radar
(350.4010) Other areas of optics : Microwaves
(350.3618) Other areas of optics : Left-handed materials
(160.3918) Materials : Metamaterials
(160.5298) Materials : Photonic crystals

ToC Category:
Metamaterials

History
Original Manuscript: November 4, 2010
Revised Manuscript: December 8, 2010
Manuscript Accepted: December 9, 2010
Published: December 13, 2010

Citation
Kazuaki Sakoda and Haifeng Zhou, "Role of structural electromagnetic resonances in a steerable left-handed antenna," Opt. Express 18, 27371-27386 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-26-27371


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