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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 18 — Aug. 29, 2011
  • pp: 17283–17292

Near-field signature of electromagnetic coupling in metamaterial arrays: a terahertz microscopy study

Jan Wallauer, Andreas Bitzer, Stefan Waselikowski, and Markus Walther  »View Author Affiliations


Optics Express, Vol. 19, Issue 18, pp. 17283-17292 (2011)
http://dx.doi.org/10.1364/OE.19.017283


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Abstract

Using terahertz near-field imaging we experimentally investigate the interaction between split-ring resonators (SRRs) in metamaterial arrays. Depending on the inter-SRR spacing two regimes can be distinguished for which strong coupling between SRRs occurs. For dense arrays SRRs couple via their electric and magnetic near-fields. In this case distinct deformations of the SRRs’ characteristic near-field patterns are observed as a signature of their strong interaction. For larger separations with a periodicity matching the resonance wavelength, the SRRs become diffractively coupled via their radiated fields. In this regime hybridization between plasmonic and lattice modes can be clearly identified in the experimentally obtained near-field maps.

© 2011 OSA

OCIS Codes
(160.3918) Materials : Metamaterials
(180.4243) Microscopy : Near-field microscopy
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Metamaterials

History
Original Manuscript: May 27, 2011
Revised Manuscript: July 13, 2011
Manuscript Accepted: July 20, 2011
Published: August 18, 2011

Virtual Issues
Vol. 6, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Jan Wallauer, Andreas Bitzer, Stefan Waselikowski, and Markus Walther, "Near-field signature of electromagnetic coupling in metamaterial arrays: a terahertz microscopy study," Opt. Express 19, 17283-17292 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-18-17283


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