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

Title
Cryogenic temperature measurement of THz meta-resonance in symmetric metamaterial superlattice
Authors
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.
Ewha Authors
우정원강보영
SCOPUS Author ID
우정원scopus
Issue Date
2011
Journal Title
Optics Express
ISSN
1094-4087JCR Link
Citation
vol. 19, no. 5, pp. 4384 - 4392
Indexed
SCI; SCIE; SCOPUS WOS scopus
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. © 2011 Optical Society of America.
DOI
10.1364/OE.19.004384
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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