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

Authors :
Woo JH
Kim ES
Choi E
Kang B
Lee HH
Kim J
Lee YU
Hong TY
Kim JH
Wu JW
Source :
Optics express [Opt Express] 2011 Feb 28; Vol. 19 (5), pp. 4384-92.
Publication Year :
2011

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.

Details

Language :
English
ISSN :
1094-4087
Volume :
19
Issue :
5
Database :
MEDLINE
Journal :
Optics express
Publication Type :
Academic Journal
Accession number :
21369268
Full Text :
https://doi.org/10.1364/OE.19.004384