Combined theoretical analysis for plasmon-induced transparency in integrated graphene waveguides with direct and indirect couplings. (28th August 2015)

• Record Type: Journal Article
• Authors: Lin, Qi; Zhai, Xiang; Wang, Lingling; Wang, Benxin; Liu, Guidong; Xia, Shengxuan
• Is Part Of: Europhysics letters. Volume 111:Number 3(2015:Aug.)
• Publication Date: 2015-08-28
• Subjects: 42.82.Et -- 73.20.Mf -- 78.67.Wj; Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1209/0295-5075/111/34004
• Languages: English
• ISSNs: 0295-5075

Abstract

Abstract: By taking a graphene nanoribbon as a resonator, we have numerically and analytically investigated the spectral characteristics of plasmon-induced transparency in integrated graphene waveguides. For the indirect coupling, the formation and evolution of the transparency window are determined by the excitation of the super resonances, as well as by the destructive interference and the coupling strength between the two resonators, respectively, while for the indirect coupling, the peak transmission and corresponding quality factor can be dynamically tuned by adjusting the Fermi energy of graphene nanoribbons and the transparency peak shifts periodicity with the round-trip phase accumulated in the graphene waveguide region. Analytical results based on temporal coupled mode theory (CMT) show good consistence with the numerical calculations. Our findings may support the design of ultra-compact plasmonic devices for optical modulating.