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Multi-band near-perfect absorption via the resonance excitation of dark meta-molecules

Title
Multi-band near-perfect absorption via the resonance excitation of dark meta-molecules
Author
이영백
Keywords
Metamaterial; Perfect absorption; Electromagnetic-induced transparency
Issue Date
2015-09
Publisher
ELSEVIER SCIENCE BV
Citation
OPTICS COMMUNICATIONS, v. 356, Page. 362-367
Abstract
We numerically study a multi-band absorption based on electromagnetic-induced-transparency effect of metamaterial. By exploiting the coupling between bright and dark plasmonic modes of cut-wire triplet, which consists of a vertical wire and two horizontal wires, a dual-band absorption is realized at 243 and 266 THz. Then, the absorber structure is improved by adding two new horizontal wires which play role as second dark meta-molecules. Due to the dark-dark coupling, another absorption band arises so that a triple-band absorption is created at 240, 250 and 264 THz. The role of interaction between dark meta-molecules in triple-band absorption is investigated, revealing a specific non-monotonic characteristic of the second absorption peak. Finally, the influence of incident angle of EM wave on multi-band absorbers shows that the absorption of lowest frequency peak is robust while those of higher frequency peaks are strongly weaken with increasing of the incident angle. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S003040181530016Xhttp://hdl.handle.net/20.500.11754/27431
ISSN
0030-4018; 1873-0310
DOI
10.1016/j.optcom.2015.08.022
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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