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...

We propose a novel simple patterned monolayer graphene metamaterial structure based on tunable terahertz plasmon-induced transparency (PIT). Destructive interference in this causes pronounced PIT phenomenon, and the response can be dynamically controlled by voltage since existence of continuous bands structural design. The theoretical transmission is calculated coupled mode theory (CMT), results are highly consistent with simulation curve. After that, influence mobility absorption...

Dual plasmon-induced transparency (PIT) and absorption (PIA) are simultaneously achieved in an integrated metamaterial composed of single layer graphene. Electric field distribution coupled mode theory (CMT) used to demonstrate the physical mechanism dual PIT PIA, theoretical result CMT is highly consistent with finite-difference time-domain (FDTD) method simulation result. Further research shows that both PIA phenomenon can be effectively modulated by Fermi level, carrier mobility graphene...

Dynamical control of perfect absorption plays an indispensable role in optical switch and modulators. However, it always suffers from the limited modulation range, small depth, susceptible efficiencies. Here, we propose a new strategy based on Friedrich–Wintgen bound states continuum (F–W BICs) to realize tunable absorber with large dynamic range. For proof concept, demonstrate pentaband ultrahigh system consisting graphene gratings sheets through elaborately tuning F–W BIC. The nature BIC...

A graphene plasmonic structure consists of three layers mingled with a silicon-air grating is proposed. We theoretically predict and numerically simulate the plasmon-induced transparency effect in this system at terahertz wavelengths, dual peaks can be successfully tuned by virtually shifting desired Fermi energy on layers. investigate surface plasmon dispersion relation means analytic calculations, we achieve numerical solution propagation constant got relation. suitable theoretical model...

In this paper, a tunable broadband metamaterial absorber (MA) based on graphene is investigated theoretically and numerically at mid-infrared regions. Compared with the previously reported multiband graphene-based MAs, broad bandwidth of 11.7 THz absorption over 90% obtained in proposed MA, which composed Jerusalem cross (JC) metal encrusting into slot layer top layer. The results show that origin caused by coupling effect between graphene, explained two-mode waveguide theory. tunability MA...

We report a theoretical and numerical investigation of the plasmon-induced transparency (PIT) effect in dual-ring resonator-coupled metal–dielectric–metal waveguide system. A transfer matrix method (TMM) is introduced to analyse transmission dispersion properties window. tunable PIT realized constant separation design. The phase slow-light are discussed both resonance non-resonance conditions. Finally, propagation based on TMM derived for periodic It found that group index window proposed...

We investigate a classic analog of electromagnetically induced transparency (EIT) in metal–dielectric–metal (MDM) bus waveguide coupled to two stub resonators. A uniform theoretical model, for both direct and indirect couplings between the stubs, is established study spectral features plasmonic waveguide, results agree well with finite difference time domain simulations. Adjusting phase coupling strength interaction, one can realize EIT-like phenomena achieve required slow light effect. The...

We propose a novel combination of radiation field model and the transfer matrix method (TMM) to demonstrate plasmon-induced transparency (PIT) in bright-dark mode waveguide structures. This is more effective convenient for describing direct coupling resonators, promoted describe transmission spectra scattering parameters quantitatively infinite element structures by combining it with TMM. verify correctness this combined through numerical simulation metal-dielectric-metal (MDM) side-coupled...

Abstract We first report a simple nanoplasmonic sensor for both universal and slow-light sensing in Fano resonance-based waveguide system. A theoretical model based on the coupling of resonant modes is provided inside physics mechanism, which supported by numerical FDTD results. The revealed evolution property shows that asymmetric factor p plays an important role adjusting FOM maximum ~4800 obtained when = 1. Finally, such also investigated. It found contradiction between width with (SWS)...

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 terahertz metasurface consisting of a graphene ribbon and three strips, which can generate significant triple plasmon-induced transparency (triple-PIT), is proposed to realize multifunction switch optical storage. Numerical simulation triple-PIT the result destructive interference between bright modes dark mode be fitted by coupled theory (CMT). The penta-frequency asynchronous quatary-frequency synchronous switches achieved modulating Fermi levels. And performance including modulation...

Abstract Direct‐current triboelectric nanogenerators (DC‐TENGs) can directly convert mechanical energy into direct current (DC) electrical energy, exhibiting wide applications in micro/nano power sources, etc. Herein, a rolling‐mode DC‐TENG based on the tribo‐photovoltaic effect is proposed, which verifies that tribovoltaic be achieved DC‐TENGs with rolling structure instead of conventional sliding structure. Utilizing all‐inorganic perovskite CsPbBr 3 , multifunctional excellent...

Mixed-dimensional heterostructures integrate materials of diverse dimensions with unique electronic functionalities, providing a new platform for research in electron transport and optoelectronic detection. Here, we report novel covalently bonded one-dimensional/two-dimensional (1D/2D) homojunction structure robust junction contacts, which exhibits wide-spectrum (from the visible to near-infrared regions), self-driven photodetection, polarization-sensitive photodetection capabilities....

We investigate electromagnetically induced transparency (EIT)-like effect in a metal-dielectric-metal (MDM) waveguide coupled to single multimode stub resonator. Adjusting the geometrical parameters of resonator, we can realize or double plasmon-induced (PIT) windows plasmonic structure. Moreover, consistency between analytical results and finite difference time domain (FDTD) simulations reveals that PIT from destructive interference resonance modes Compared with previous EIT-like scheme...

We report the sensing characteristic based on plasmon induced transparency in nanocavity-coupled metal-dielectric-metal waveguide analytically and numerically. A simple model for nature is first presented by coupled mode theory. show that coupling strength resonance detuning play important roles optimizing performance detection limit of sensor, an interesting double-peak also obtained such plasmonic sensor. In addition, specific refractive index width dielectric environment discovered...

We propose an expanded coupled mode theory to analyze sensing performance in a plasmonic slot waveguide side-coupled with multimode stub resonator. It is confirmed by the finite-difference time-domain simulations. Through adjusting parameters, we can realize figure of merit (FOM) ∼59,010, and sensitivity S reach 75.7. Compared systems recent Letters, our proposed structure has advantages easy fabrication, compactness, sensitivity, high FOM. The model findings provide guidance for fundamental...

Abstract We propose a nanoplasmonic waveguide side-coupled with bright-dark-dark resonators in our paper. A multi-oscillator theory derived from the typical two-oscillator model, is established to describe spectral features as well slow-light effects structures and confirmed by finite-difference time domain (FDTD). That plasmon induced transparency (PIT) turns double PIT spectra observed this structure. At same time, multi-switching obvious bands based on are also discovered proposed What’s...

A novel monolayer graphene structure whose unit cell possesses two rectangular defects is proposed. very obvious dual plasmon-induced transparency (PIT) effect can be successfully achieved by the destructive interference in terahertz region. The PIT easily tuned changing Fermi energy of graphene. Since our exists a continuous form, we simply apply bias voltage to achieve tuning performance compared those structures with discontinuous patterns. We have deduced expression theoretical...

Black phosphorus (BP) is a novel plasmonic materials at the infrared and terahertz regions. We have theoretically investigated anisotropic of in-plane monolayer BP in terms conductivity. designed periodic structure for special shape achieved an obvious plasmon-induced transparency phenomenon. The results finite difference time domain simulation coupled mode theory are consistent good agreement. It found that bandwidth phenomenon window can be effectively adjusted by changing structure. Since...