Tunable dual-band perfect metamaterial absorber based on a graphene-SiC hybrid system by multiple resonance modes

Abstract

We propose dynamically tunable dual-band perfect absorption of light in a composite structure, which consists of a graphene ribbon array coated on a dielectric layer, a silicon carbide (SiC) film and a distributed Bragg reflector (DBR). Two absorption peaks reaching 98.8% at 10.87 μm and 97.5% at 12.4 μm are observed in the hybrid structure. The dual-band absorption enhancement can be explained by two different mechanisms: one is attributed to the graphene localized surface plasmons (GLSP), and the other is originated from the excitation of Tamm plasmon polaritons (TPP) at the interface between SiC and DBR. Moreover, the high absorption peaks can be modulated by altering the geometrical parameters or dynamically controlling the chemical potential of graphene ribbons. More significantly, we numerically and theoretically investigate the hybridization between GLSP mode and TPP mode, which is characterized by the anti-crossing behaviour of the two modes. The mode splitting phenomenon is a typical Rabi splitting. In addition, we also study the coupling characteristics based on graphene surface plasmons (GSP) mode and TPP mode. This work offers a new paradigm for enhancing light-matter interaction through multiple resonance modes, and the proposed device could provide potential applications in MIR plasmonic devices, such as absorbers, detectors, and modulators, etc.

A Narrow Dual-Band Monolayer Unpatterned Graphene-Based Perfect Absorber with Critical Coupling in the Near Infrared

“…and the optical absorption is calculated using A = 1 − |Г| 2 [42] to give: Figure 2A gives the absorption spectra of the cross-circle graphene absorbers and single-structure absorbers at a normal incidence. Undoubtedly, the cross-circle absorber significantly improved the absorption of graphene in the near-infrared region.…”

Independently Tunable Dual-Band Perfect Absorption in a Dual-Resonance Hybrid Structure Incorporating Graphene

“…Furthermore, the critical coupling induced by GMRs and OTSs can be illustrated by the coupled mode theory (CMT) [23], in which the spectral characteristics of the single-port structure with lossy medium loaded can be analytically interpreted [24]. The time domain evolution equation of the two resonant modes with each resonant frequency at ω i is governed by [14]:…”

“…For this case, some hybrid systems with multiple resonant modes have been proposed. Qing [14]et al achieved tunable dual-band perfect absorption in a composite structure consists of a graphene ribbon array and a distributed Bragg reflector. Cai [15]et al implemented a dual-band graphenebased absorber combining the magnetic resonance with a cold mirror.…”

Design of a dual-band terahertz metamaterial absorber using two identical square patches for sensing application

“…[18][19][20][21][22][23][24][25][26] Dual-band metamaterial absorbers were also demonstrated using the stacked structural design methods. [27][28][29][30][31][32][33][34] Other structural designs were also suggested to achieve the dual-band absorption performance, including cuboid ferrite particle, 35 circular sector resonator, 36 graphene-SiC hybrid system, 37 cylinder MoS 2dielectric array, 38 and asymmetric double-split ring resonators. 39 Although various kinds of structures have been proposed to achieve dual-band absorption, there are still many similar shortcomings in these designs, which limit their practical application to a certain extent.…”