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