Affiliation of Author(s):[1]Univ Elect Sci & Technol China, Sch Elect Sci & Engn, Terahertz Sci Cooperat Innovat Ctr, Chengdu 610054, Peoples R China;[2]Hebei Semicond Res Inst, Natl Key Lab Applicat Specif Integrated Circuit, Shijiazhuang 050051, Hebei, Peoples R China
Journal:OPTICS EXPRESS
Key Words:Electric excitation - Electromagnetic wave polarization - Graphene - Light transmission - Phonons - Photons - Surface plasmon resonance - Terahertz waves - Transmissions - Waveguides
Abstract:Surface plasmon polaritons have been extensively studied owing to the promising characteristics of near fields. In this paper, the cascade coupling of graphene surface plasmon polaritons (GSPPs) originating from cascading excitation and multiple coupling within a composite graphene-dielectric stack is presented. GSPPs confined to graphene layers are distributed in the entire stack as waveguide modes. Owing to the near-field enhancement effect and large lifetime of the GSPPs, the terahertz wave-graphene interaction is significantly enhanced, which induces an ultra-extraordinary optical transmission (UEOT) together with the reported negative dynamic conductivity of graphene. Furthermore, owing to cascade coupling, the UEOT exhibits considerable transmission enhancement, up to three orders of magnitude, and frequency and angle selections. Based on the key characteristics of cascade coupling, the mode density and coupling intensity of GSPPs, the dependences of the number of graphene layers in the stack, the thickness of dielectric buffers, and the effective Fermi levels of the graphene on the UEOT are also analyzed. The proposed mechanism can pave the way for using layered plasmonic materials in electric devices, such as amplifiers, sensors, detectors, and modulators. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Document Type:Article
Volume:28
Issue:21
Page Number:30502-30512
ISSN No.:1094-4087
Translation or Not:no