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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 1 — Jan. 2, 2012
  • pp: 42–47

Low-loss terahertz metamaterial from superconducting niobium nitride films

C. H. Zhang, J. B. Wu, B. B. Jin, Z. M. Ji, L. Kang, W. W. Xu, J. Chen, M. Tonouchi, and P. H. Wu  »View Author Affiliations

Optics Express, Vol. 20, Issue 1, pp. 42-47 (2012)

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This paper reports a type of low Ohmic loss terahertz (THz) metamaterials made from low-temperature superconducting niobium nitride (NbN) films. Its resonance properties are studied by THz time domain spectroscopy. Our experiments show that its unloaded quality factor reaches as high as 178 at 8 K with the resonance frequency at around 0.58 THz, which is about 24 times that of gold metamaterial at the same temperature. The unloaded quality factor keeps at a high level, above 90, even when the resonance frequency increases to 1.02 THz, which is close to the gap frequency of NbN film. All these experimental observations fit well into the framework of Bardeen-Copper-Schrieffer theory and equivalent circuit model. These new metamaterials offer an efficient way to the design and implementation of high performance THz electronic devices.

© 2011 OSA

OCIS Codes
(260.5740) Physical optics : Resonance
(160.3918) Materials : Metamaterials
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:

Original Manuscript: October 10, 2011
Revised Manuscript: November 22, 2011
Manuscript Accepted: December 2, 2011
Published: December 19, 2011

C. H. Zhang, J. B. Wu, B. B. Jin, Z. M. Ji, L. Kang, W. W. Xu, J. Chen, M. Tonouchi, and P. H. Wu, "Low-loss terahertz metamaterial from superconducting niobium nitride films," Opt. Express 20, 42-47 (2012)

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