Graphene plasmonically induced analogue of tunable electromagnetically induced transparency without structurally or spatially asymmetry

Abstract

Electromagnetically induced transparency (EIT) arises from the coherent coupling and interference between a superradiant (bright) mode in one resonator and a subradiant (dark) mode in an adjacent resonator. Generally, the two adjacent resonators are structurally or spatially asymmetric. Here, by numerical simulation, we demonstrate that tunable EIT can be induced by graphene ribbon pairs without structurally or spatially asymmetry. The mechanism originates from the fact that the resonate frequencies of the bright mode and the dark mode supported by the symmetrical graphene ribbon pairs can be respectively tuned by electrical doping levels, and when they are tuned to be equal the graphene plasmon coupling and interference occurs. The EIT in symmetrical nanostructure which avoids deliberately breaking the element symmetry in shape as well as in size facilitates the design and fabrication of the structure. In addition, the work regarding to EIT in the structurally symmetric could provide a fresh contribution to a more comprehensive physical understanding of Fano resonance.

Vertical graphene/MoS2 van der Waals heterostructure photodetector

“…However, the device based on a single material cannot satisfy some functions simultaneously, such as ultra-wide spectra, ultra-fast response, ultra-low dark current, which greatly limits the application development. Through designing different structures 8 or fabricating of a heterostructure with different 2D materials [9][10][11] , we can form various band structures, which can result in outstanding performance. Graphene, with a gapless band structure and high in-plane carrier mobility, was also widely used in heterostructure devices as an electrode or charge separation layer [12][13][14] .…”

Terahertz graphene-based multi-functional anisotropic metamaterial and its equivalent circuit model

“…Graphene-based metamaterials containing two parallel graphene ribbons in each unit cell were proposed and designed as filtering applications in Refs. 13 , 14 . The metamaterial in Ref.…”

“…The metamaterial in Ref. 14 contains ribbons that are infinite from one side and finite from another side. The metamaterials don’t contain metal layers beneath the structures to avoid transmission and they were analyzed from the transmission point of view.…”

“… 13 doesn’t contain any theoretical analysis and the structure in Ref. 14 is analyzed based on coupled mode theory.…”

Design Optimization and Fabrication of Graphene/J-Aggregate Kretschmann-Raether Devices for Refractive Index Sensing Using Plasmon-Induced Transparency Phenomena

“…More importantly, in the frequency range of terahertz photons are easily coupled with graphene surface plasmon waves (which is associated with significant properties) 50 . Yuwen and coworkers could control PIT by varying the energy gap in a range of 0.25-0.85 eV in a frequency range of 15 to 26 THz without disturbing the existing physical structure and symmetry using graphene ribbons on a silicon substrate 51 . In addition to controlling the transparent window, they evaluated the linewidth in the range of Fermi level shift.…”