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, J. W. Wu

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


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
Issue number5
StatePublished - 28 Feb 2011


Dive into the research topics of 'Cryogenic temperature measurement of THz meta-resonance in symmetric metamaterial superlattice'. Together they form a unique fingerprint.

Cite this