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...

An ultra-wideband solar energy absorber composed of a Ti ring and SiO₂–Si₃N₄–Ti thin film is proposed. It was found that the absorption efficiency over 90% with broadband 3683 nm.

Terahertz functional devices have been instrumental in the development of terahertz technology. Moreover, advent metamaterials has greatly contributed to advancement devices. However, most today's band exhibit poor performance and are mono-functional. This limits scalability application potential To achieve diversification tunability device functionality, we propose a combination metamaterial structures vanadium dioxide film. A absorber based on thermotropic phase change material VO2...

We find that the solar energy absorption efficiency is high under a spectrum at AM 1.5, and it also has polarization-independence incidence insensitivity. Our absorber widest operating band compared with similar absorbers reported previously.

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...

Nonreciprocal devices are essential and crucial in optics for source protection signal separation. A hybrid grating system consisting of a silicon grating, graphene layer, waveguide layer is employed to create high- Q quasi-BIC (bound state the continuum). Then, properties harnessed enhance third-order nonlinear effect silicon, thereby improving nonreciprocal characteristics device. The transmittance ratio device can be tunable by adjusting Fermi energy level, achieving tunability ranging...

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...

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...

Excellent and wide-band absorption is of great benefit for lots applications such as photoelectric conversions, photonics commutations well photovoltaic cells. Here, a simple MXene/Au-based metamaterial, consisting thick layer Ti3C2Tx Au-Nanorod, studied through finite-difference time-domain (FDTD) method realization tunable strong in the visible near infrared. The results show that enhanced with AMAX = 0.99 can be realized proposed metamaterial. Moreover, effectively tuned by structural...

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...

This paper proposes a novel and perfect absorber based on patterned graphene vanadium dioxide hybrid metamaterial, which can not only achieve wide-band absorption dual-channel in the terahertz band, but also realize their conversion by adjusting temperature to control metallic or insulating phase of VO2. Firstly, spectrum proposed structure is analyzed without graphene, where reach as high 100% at one frequency point (f = 5.956 THz) when VO2 metal phase. What merits attention that addition...

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...

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...

Abstract A suspended monolayer graphene has only about 2.3% absorption rate in visible and infrared band, which limits its optoelectronic applications. To significantly increase graphene’s efficiency, a tunable dual-band polarization-insensitive coherent perfect absorber (CPA) is proposed the mid-infrared regime, contains silicon array coupled double-layers waveguide. Based on FDTD methods, peaks are achieved 9611 nm 9924 nm, respectively. Moreover, due to center symmetric feature, also...