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 Hoon Kim, J. W. Wu

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Abstract

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.

Original languageEnglish
Pages (from-to)4384-4392
Number of pages9
JournalOptics Express
Volume19
Issue number5
DOIs
Publication statusPublished - 2011 Feb 28

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Woo, J. H., Kim, E. S., Choi, E., Kang, B., Lee, H. H., Kim, J., Lee, Y. U., Hong, T. Y., Kim, J. H., & Wu, J. W. (2011). Cryogenic temperature measurement of THz meta-resonance in symmetric metamaterial superlattice. Optics Express, 19(5), 4384-4392. https://doi.org/10.1364/OE.19.004384