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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 7 — Mar. 31, 2008
  • pp: 4785–4796

Evaluation of effective electric permittivity and magnetic permeability in metamaterial slabs by terahertz time-domain spectroscopy

Yosuke Minowa, Takashi Fujii, Masaya Nagai, Tetsuyuki Ochiai, Kazuaki Sakoda, Kazuyuki Hirao, and Koichiro Tanaka  »View Author Affiliations


Optics Express, Vol. 16, Issue 7, pp. 4785-4796 (2008)
http://dx.doi.org/10.1364/OE.16.004785


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Abstract

We established a novel method to evaluate effective optical constants by terahertz (THz) time domain spectroscopy and suggested a strict definition of optical constants and an expression for electromagnetic energy loss following the second law of thermodynamics. We deduced the effective optical constants of phosphor bronze wire grids in the THz region experimentally and theoretically. The results depend strongly on the polarization of the THz waves. When the electric field is parallel to the wires, we observed Drude-like electric permittivities with a plasma frequency reduced by a factor of 10-3, whereas when the field is perpendicular, the sample behaved as a simple dielectric film. We also observed unexpected magnetic permeabilities, which originate from the non-resonant real magnetic response of finite size-conductors.

© 2008 Optical Society of America

OCIS Codes
(260.3910) Physical optics : Metal optics
(300.6270) Spectroscopy : Spectroscopy, far infrared

ToC Category:
Metamaterials

History
Original Manuscript: January 4, 2008
Revised Manuscript: February 10, 2008
Manuscript Accepted: February 25, 2008
Published: March 24, 2008

Citation
Yosuke Minowa, Takashi Fujii, Masaya Nagai, Tetsuyuki Ochiai, Kazuaki Sakoda, Kazuyuki Hirao, and Koichiro Tanaka, "Evaluation of effective electric permittivity and magnetic permeability in metamaterial slabs by terahertz time-domain spectroscopy," Opt. Express 16, 4785-4796 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-7-4785


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