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Wideband tunable perfect absorption of graphene plasmons via attenuated total reflection in Otto prism configuration
Nong, Jinpeng1,2; Tang, Linlong2; Lan, Guilian1; Luo, Peng1; Guo, Caicheng1; Yi, Juemin3; Wei, Wei1
2020-03-01
摘要A strategy is proposed to achieve wideband tunable perfect plasmonic absorption in graphene nanoribbons by employing attenuated total refraction (ATR) in Otto prism configuration. In this configuration, the Otto prism with a deep-subwavelength dielectric spacer is used to generate tunneling evanescent waves to excite localized plasmons in graphene nanoribbons. The influence of the configuration parameters on the absorption spectra of graphene plasmons is studied systematically, and the key finding is that perfect absorption can be achieved by actively controlling the incident angle of light under ATR conditions, which provides an effective degree of freedom to tune the absorption properties of graphene plasmons. Based on this result, it is further demonstrated that by simultaneously tuning the incident angle and the graphene Fermi energy, the tunable absorption waveband can be significantly enlarged, which is about 3 times wider than the conventional cavity-enhanced configuration. Our proposed strategy to achieve wideband, tunable graphene plasmons could be useful in various infrared plasmonic devices.
关键词graphene plasmons perfect absorption attenuated total reflection wide waveband
DOI10.1515/nanoph-2019-0400
发表期刊NANOPHOTONICS
ISSN2192-8606
卷号9期号:3页码:645-655
通讯作者Tang, Linlong(tll@cigit.ac.cn) ; Wei, Wei(wwei@cqu.edu.cn)
收录类别SCI
WOS记录号WOS:000514854700007
语种英语