Characterizations of a thermo-tunable broadband fishnet metamaterial at THz frequencies

Title
Characterizations of a thermo-tunable broadband fishnet metamaterial at THz frequencies
Author
이영백
Keywords
Metamaterials; Left-handed behavior; Fishnet structure
Issue Date
2015-04
Publisher
ELSEVIER SCIENCE BV
Citation
COMPUTATIONAL MATERIALS SCIENCE, v. 103, Page. 189-193
Abstract
"Looking for alterable metamaterials, whose electromagnetic properties can be dynamically and real-time controlled, has attracted a great attention recently. In this paper, we present a numerical study of thermo-tunable polarization-insensitive fishnet metamaterials operating at THz regime. The conventionally used metal is replaced by InSb in which the temperature-dependent conductivity plays a key role in tuning the left-handed frequency. By increasing the temperature of the InSb patterns from 300 to 350 K, we show that the left-handed transmission peak can shift from 0.8 to 1.1 THz and fractional bandwidth of the negative refractive index goes from 14% to 22%. Thermally increased carrier density of InSb is found to be the reason for the enhanced magnetic resonance and stronger left-handed behavior in addition to the tunability. The equivalent LC circuit model and standard retrieval method are performed to elaborate our proposed idea. (C) 2015 Elsevier B.V. All rights reserved."
URI
http://www.sciencedirect.com/science/article/pii/S0927025615001391http://hdl.handle.net/20.500.11754/23890
ISSN
0927-0256; 1879-0801
DOI
10.1016/j.commatsci.2015.02.038
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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