期刊
PLASMONICS
卷 12, 期 6, 页码 1825-1831出版社
SPRINGER
DOI: 10.1007/s11468-016-0450-8
关键词
Terahertz absorption; Graphene; Surface plasmons; Otto configuration
资金
- National Natural Science Foundation of China [61505111, 61575127, 61490713]
- Guangdong Natural Science Foundation Grant [2015A030313549]
- Science and Technology Planning Project of Guangdong Province [2016B050501005]
- Science and Technology Project of Shenzhen [JCYJ20140828163633996, JCYJ20150324141711667]
- China Postdoctoral Science Foundation [2015M572350]
- Natural Science Foundation of SZU [827-000051, 827-000052, 827-000059, 201452, 201517]
Perfect terahertz (THz) absorption in the modified Otto configuration with the insertion of monolayer graphene sheet has been numerically demonstrated. This perfect absorption originates from the enhancement of the electrical field owing to the excitation of the transverse magnetic (TM) polarized surface plasmons at the interface of two dielectrics with monolayer graphene. It is found that the absorption peak occurs at the specific incident angles, which can be employed for realizing the angular absorbers. We further demonstrate that the angle of the peak absorption and the corresponding wavelength can be manipulated by changing the Fermi energy of monolayer graphene sheet via electrostatic biasing. Moreover, the behaviors of the perfect absorption are strongly dependent on the dielectric constants and thicknesses of the surrounding dielectrics.
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