A tunable dual-band stop-band THz spectrum can be realized in a hybrid structure, which consists of metal nanoribbon arrays clad by graphene nanoribbons. Dual-band spectra can be controlled separately by the nanoribbo...A tunable dual-band stop-band THz spectrum can be realized in a hybrid structure, which consists of metal nanoribbon arrays clad by graphene nanoribbons. Dual-band spectra can be controlled separately by the nanoribbon width ω and graphene chemical potential μ_c. We explain that two local plasmonic modes excited at graphene ribbons belong to different gratings, which uncouple with each other by electro-magnetic shielding of the metal ribbons. Furthermore, plasmonic induced transparent(PIT) effects can also be realized by making the two transmission notches close to each other, with better performance than the PIT system based on plasmonic coupling,such as with a larger extinction radio and a tunable transparency window.展开更多
基金Supported by the Key Disciplines of Physics of Guizhou Province under Grant No QXWB[2013]18the Major Research Projects for Innovation Groups of Guizhou Province under Grant No KY[2018]028+4 种基金the National Natural Science Foundation of China under Grant No 11464052the Science and Technology Foundation of Guizhou Province under Grant No J[2015]2149the Youth Foundation of the Education Department of Guizhou Province under Grant No KY[2017]248the Startup Foundation for Doctors of Zunyi Normal University under Grant No 40300326the Natural Science Foundation of Jiangxi Province under Grant No 20161BAB201002
文摘A tunable dual-band stop-band THz spectrum can be realized in a hybrid structure, which consists of metal nanoribbon arrays clad by graphene nanoribbons. Dual-band spectra can be controlled separately by the nanoribbon width ω and graphene chemical potential μ_c. We explain that two local plasmonic modes excited at graphene ribbons belong to different gratings, which uncouple with each other by electro-magnetic shielding of the metal ribbons. Furthermore, plasmonic induced transparent(PIT) effects can also be realized by making the two transmission notches close to each other, with better performance than the PIT system based on plasmonic coupling,such as with a larger extinction radio and a tunable transparency window.
