Wideband tunable perfect absorption of graphene plasmons via attenuated total reflection in Otto prism configuration
Nong Jinpeng,
Tang Linlong,
Lan Guilian,
Luo Peng,
Guo Caicheng,
Yi Juemin,
Wei Wei
Affiliations
Nong Jinpeng
Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China
Tang Linlong
Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, PR China
Lan Guilian
Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China
Luo Peng
Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China
Guo Caicheng
Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China
Yi Juemin
Institut für Physik, Carl von Ossietzky Universität, D-26111 Oldenburg, Germany
Wei Wei
Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China
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.
