Abstract The plasmon-induced transparency (PIT), which is destructive interference between the superradiation mode and subradiation mode, studied in patterned graphene-based terahertz metasurface composed of graphene ribbons strips. As results finite-difference time-domain (FDTD) simulation coupled-mode theory (CMT) fitting, PIT can be dynamically modulated by dual-mode. left (right) transmission dip mainly tailored gate voltage applied to (stripes), respectively, meaning a dual-mode...

Abstract A novel multilayer terahertz metamaterial composed of double rectangle, vertical single rectangle and graphene layer is proposed. The dynamic adjustable triple plasmon induced transparency (PIT) realized by coupling two bright modes dark modes, which an especial synergy effect between single-PIT. Coupled mode theory contained four resonators employed to explain the triple-PIT, theoretical results exhibit excellent consistency with finite-difference time-domain. Surprisingly,...

A monolayer graphene metamaterial comprising four strips and blocks is proposed to produce triple plasmon-induced transparency (PIT) by the interaction of three bright modes one dark mode. The response structure analyzed using couple mode theory finite-difference time-domain simulations, with results each method showing close agreement. quadruple-mode on-to-off modulation based on synchronous or asynchronous switching realized tuning Fermi levels in graphene, its degrees amplitude are 77.7%,...

Abstract A terahertz multifunction modulator composed of upper-layer double graphene ribbons and lower-layer a strip, which can generate Fano resonance produced by hybrid between broad mode narrow mode, is proposed to realize electro-optical switch filtering function. The electric field distribution, theory, quantum level theory are all employed explain the resonance, whose transmission spectra fitted coupled theory. In comparison other graphene-based modulators, amplitude modulation degree...

A mono-layer metamaterial comprising four graphene-strips and one graphene-square-ring is proposed herein to realize triple plasmon-induced transparency (PIT). Theoretical results based on the coupled mode theory (CMT) are in agreement with simulation obtained using finite-difference time-domain (FDTD). An optical switch investigated characteristics of graphene dynamic modulation, modulation degrees amplitude 90.1%, 80.1%, 94.5%, 84.7% corresponding 1.905 THz, 2.455 3.131 4.923 respectively....

A multilayer patterned graphene metamaterial composed of rectangular graphene, square and X-shaped is proposed to achieve dual plasmon-induced transparency (PIT) at terahertz frequency. The coupled mode theory calculations are highly consistent with the finite-difference time-domain numerical results. Interestingly, a photoelectric switch has been realized, whose extinction ratio modulation degree amplitude can be 7.77 dB 83.3% insertion loss 7.2%. In addition, any dips modulated by tuning...

Double narrowband induced perfect absorption in the terahertz region is achieved a graphene-dielectric-gold hybrid metamaterial, whose physical mechanism analyzed using coupled-mode theory (CMT), which agreed well with finite-difference time-domain (FDTD) simulation. This study found that Fermi level of graphene can be adjusted to improve absorptivity when refractive index (RI) nd chosen dielectric cannot achieve good effect. In addition, blue shift spectrum used design dual-frequency...

This study proposes a graphene metamaterial desensitized to the polarized angle produce tunable quadruple plasmon-induced transparency (PIT). As tool employed explain PIT, n -order coupled mode theory (CMT) is deduced for first time and closely agrees with finite-difference time-domain (FDTD) simulations according PIT results in case of = 5. Additionally, response proposed structure light investigated. result, Boltzmann function satisfied by strips polarization direction incident time. Its...

A simple monolayer graphene metamaterial based on silicon/silica substrates is proposed, and typical triple-plasmon-induced transparency (PIT) realized in the terahertz band. The physical mechanism analyzed by coupled mode theory (CMT), results of CMT agree well with finite-difference time-domain simulation. multimode electro-optical switch can be designed dynamic tuning, modulation degrees its resonant frequencies are 84.0%, 87.3%, 83.0%, 88.1%, 76.7%. In addition, triple-PIT gradually...

A terahertz-band metamaterial composed of multilayer patterned graphene is proposed and triple plasmon-induced transparency excited by coupling three bright modes with one dark mode. The Lorentz curve calculated the coupled-mode theory agrees well finite-difference time-domain results. Dynamic tuning investigated changing Fermi level. Multimode electro-optics switching can be designed achieved, amplitude modulations four resonance frequencies are 94.3%, 92.8%, 90.7%, 93%, respectively, which...

An m-shaped graphene-based metasurface is proposed, which can produce a dual dynamically tunable plasmonically induced transparency by coupling among dark mode and two bright modes. The numerical theoretical results exhibit prominent consistency. result shows that when the Fermi level of graphene low, exhibits lossy dielectric; conversely, it has metallic properties. Moreover, group delay be as high 0.6 ps demonstrating ultra-slow light effects. Thus, this study provides guidance for design...

Abstract A bilayer metamaterial composed of double graphene strips and square-ring is proposed to realize plasmon induced transparency (PIT). The couple mode theory (CMT) employed explain the phenomenon PIT, whose results are in good agreement with simulation finite-difference time-domain. dynamically adjustable PIT investigated, where an on-to-off modulation synchronous asynchronous switching realized by modulating Fermi levels graphene, degrees amplitude 67.5%, 86.1%, 65.3%, respectively....

In vacuum arc (VA), when the current is very high (usually in tens of kilo-ampere), heat flux density injecting into an anode larger and leads to a higher temperature with increasing current. The strong evaporation drives evaporated atoms from surface column. Simultaneously, impact cathode plasma, then micro processes as ionization recombination between plasma will happen. this paper, two fluid three-dimensional (3D) magneto-hydro-dynamic (MHD) model VA considering built, influence vapor its...

An H-type-graphene-based slow-light metamaterial is proposed to produce a dual plasmon-induced transparency phenomenon, which can be effectively modulated by Fermi level, carrier mobility of graphene, and the medium environment. The data calculated coupled mode theory results numerical simulation show prominent agreement. In addition, both simplicity continuity units graphene-based are extraordinary advantages. Furthermore, characteristics structure that group refractive index as high 237,...

In this study, multilayer graphene metamaterials comprising blocks and ribbon are proposed to realize dynamic plasmon-induced transparence (PIT). By changing the position between blocks, PIT phenomenon will occur in different terahertz bands. Furthermore, with a transparent window width of 1 THz has been realized. addition, shows redshifts or blueshifts disappears altogether upon Fermi level graphene, hence frequency selector from 3.91 7.84 an electro-optical switch can be Surprisingly,...

Abstract A silicon-graphene-silica periodic graphene metamaterial, comprising of a graphene-strip, graphene-block, and graphene-ribbon, is proposed to realize dynamic triple plasmon-induced transparency (PIT). Coupled mode theory employed explain this phenomenon, the results are in close agreement with finite-difference time-domain simulation. It interesting note that triple-PIT can also be realized by using silver instead silicon layer. When Fermi level 0.75 eV, difference based on two...

A graphene-based tunable dual-band metamaterial absorber which is polarization insensitive numerically proposed at mid-infrared frequencies. In numerical simulation the exhibits two absorption peaks resonance wavelengths of 6.246 μm and 6.837 when Fermi level graphene fixed 0.6 eV. Absorption spectra different levels are displayed tuning functions discussed in detail. Both blue shift with increase graphene. Moreover, surface current distributions on gold resonator ground plane simulated to...

Abstract Bound states in the continuum (BICs) have been engineered periodic photonic systems to achieve diverse polarization behavior momentum space. By breaking C 2 z symmetry of crystal slabs (PhCS), purely circular polarization, which hold significant potential for applications topological physics and chiral optics, can be achieved near BICs. In this study, intriguing phenomenon BICs on degenerate band PhCS with a triangular lattice featuring cylindrical holes are investigated. Unlike...

Abstract Twisted bilayer graphene strips are proposed to excite dual-plasmon-induced-transparency (DPIT). Coupled mode theory is employed fit the transmission spectra of finite-difference time-domain numerical simulations. When upper- and lower-layers perpendicular each other, an electric-optic switch can be realized only by changing Fermi level graphene, modulation degree amplitude reaches 55%. Interestingly, DPIT degenerated single PIT gradually disappeared angle between thus multimode...

The designs of single ellipse-shape metamaterials (SESM) and cross (CESM) in the infrared (IR) wavelength range are presented. They composed a tailored gold (Au) layer on silicon (Si) substrate. characterizations proposed devices can have their electromagnetic responses manipulated between single-band dual-band resonances by changing different ratios macro-axis minor-axis ESM. behavior resonance exhibits with broad bandwidth or narrow bandwidth. corresponding free spectral (FSR) could be...

Recently, metamaterials have attracted considerable attention because of their unique properties and potential applications in many areas, such as bio-sensing, imaging, communication. Among these researches, the metamaterial absorber has aroused much interest researchers. The is important due to a broad range application solar energy, sensing, coatings for reducing reflection, selective thermal emitters. As two-dimensional honeycomb structure composed single layer carbon atom, graphene...