Abstract
A monolayer-graphene-based concentric-double-rings (CDR) structure is reported to achieve broadband plasmon-induced transparency (PIT) on the strength of edge mode in the mid-infrared regime. The theoretical analysis and simulation results reveal that the structure designed here has two plasmonic resonance peaks at 39.1 and 55.4 THz, and a transparency window with high transmission amplitude at the frequency of 44.1 THz. Based on the edge mode coupling between neighbor graphene ribbons, PIT phenomenon is produced through the interference between different (bright and dark) modes. The frequency and bandwidth of the transparency window and slow light time could be effectively adjusted and controlled via changing geometrical parameters of graphene or applying different gate voltages. Additionally, this structure is insensitive to the polarization and incident angle. This work has potential application on the optical switches and slow light modulators.
Highlights
A single layer of carbon atoms gathered in a two-dimensional honeycomb lattice [1,2,3], has attracted significant attention in past few years owing to its excellent physical properties, such as ultra-high electronic mobility [4], extremely low loss [5], stable optical response [6] and more importantly, tunable surface conductivity [7,8]
We have proposed a monolayer-graphene-based CDR structure to realize broadband Plasmon-induced transparency (PIT) on the strength of edge mode in the mid-infrared spectrum
The simulation results show that the structure has two plasomonic resonance peaks at 39.1 and 55.4 THz, and a transparency window with high amplitude at the frequency of 44.1 THz
Summary
A single layer of carbon atoms gathered in a two-dimensional honeycomb lattice [1,2,3], has attracted significant attention in past few years owing to its excellent physical properties, such as ultra-high electronic mobility [4], extremely low loss [5], stable optical response [6] and more importantly, tunable surface conductivity [7,8]. RReessuullttss aanndd DDiissccuussssiioonn IInn oorrddeerr ttoo ddeemmoonnssttrraattee tthhee PPIITT eeffffeecctt,, wwee nnuummeerriiccaallllyy ccaallccuullaatteedd tthhee ttrraannssmmiissssiioonn ssppeeccttrruumm ooff tthhee uunniitt cceellll wwiitthh ddiiffffeerreenntt ppaatttteerrnneedd ggrraapphheennee ssttrruuccttuurreess..
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