期刊
NANOSCALE RESEARCH LETTERS
卷 15, 期 1, 页码 -出版社
SPRINGEROPEN
DOI: 10.1186/s11671-019-3237-y
关键词
Plasmon-induced transparency; Graphene; Dual-mode on-to-off modulation; Metasurface
资金
- National Natural Science Foundation of China [11847026, 61764005, 11804093]
- Scientific Project of Jiangxi Education Department of China [GJJ160532]
- Graduate Education Reform Project of Jiangxi Province of China [JXYJG-2017-080]
- Natural Science Foundation of Jiangxi Province [20192BAB212003]
The plasmon-induced transparency (PIT), which is destructive interference between the superradiation mode and the subradiation mode, is studied in patterned graphene-based terahertz metasurface composed of graphene ribbons and graphene strips. As the results of finite-difference time-domain (FDTD) simulation and coupled-mode theory (CMT) fitting, the PIT can be dynamically modulated by the dual-mode. The left (right) transmission dip is mainly tailored by the gate voltage applied to graphene ribbons (stripes), respectively, meaning a dual-mode on-to-off modulator is realized. Surprisingly, an absorbance of 50% and slow-light property of 0.7 ps are also achieved, demonstrating the proposed PIT metasurface has important applications in absorption and slow-light. In addition, coupling effects between the graphene ribbons and the graphene strips in PIT metasurface with different structural parameters also are studied in detail. Thus, the proposed structure provides a new basis for the dual-mode on-to-off multi-function modulators.
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