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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 5 — Feb. 28, 2011
  • pp: 4384–4392

Cryogenic temperature measurement of THz meta-resonance in symmetric metamaterial superlattice

J. H. Woo, E. S. Kim, E. Choi, Boyoung Kang, Hyun-Hee Lee, J. Kim, Y. U. Lee, Tae Y. Hong, Jae H. Kim, and J. W. Wu  »View Author Affiliations

Optics Express, Vol. 19, Issue 5, pp. 4384-4392 (2011)

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A symmetric metamaterial superlattice is introduced accommodating a high Q-factor trapped mode. THz time-domain spectroscopy is employed to measure the transmission spectra, identifying the excitation of trapped and open-modes in the meta-resonances. A finite-difference-time-domain calculation showed that the trapped mode excitation is from the cancelation of current densities among the nearest-neighboring meta-particles. A cryogenic temperature THz measurement is carried out to examine the temperature dependence of resonance characteristics of meta-resonances. At low temperatures, the temperature-independent radiative damping is dominant for the open-mode, while the Q-factor of the trapped mode is determined by the temperature-dependent phonon scattering and temperature-independent defect scattering with the radiative damping significantly suppressed. When compared with the room temperature measurement, a 16% increase in Q-factor is observed for the trapped mode, while a 7% increase for the open-mode at the cryogenic temperature.

© 2011 Optical Society of America

OCIS Codes
(160.3918) Materials : Metamaterials
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:

Original Manuscript: December 21, 2010
Revised Manuscript: February 15, 2011
Manuscript Accepted: February 17, 2011
Published: February 22, 2011

J. H. Woo, E. S. Kim, E. Choi, Boyoung Kang, Hyun-Hee Lee, J. Kim, Y. U. Lee, Tae Y. Hong, Jae H. Kim, and J. W. Wu, "Cryogenic temperature measurement of THz meta-resonance in symmetric metamaterial superlattice," Opt. Express 19, 4384-4392 (2011)

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