A dual-band THz absorber based on graphene sheet and ribbons

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.…”

Metal and graphene hybrid metasurface designed ultra-wideband terahertz absorbers with polarization and incident angle insensitivity

“…On the other hand, graphene that supports surface plasmons in the terahertz range is also found to be a ne material for absorption. 34,35 Graphene based metamaterial/metasurface absorbers also have all sorts of shapes, such as graphene micro-ribbon arrays, 36 dual pairs of graphenegermanium arrays, 37 graphene ribbons and sheets 38 and graphene layers covered on dielectric pillar arrays. 39 Though the above metal and graphene based metamaterial/metasurface absorbers realized efficient absorptivity performance, their bandwidths are narrow owing to their strong plasmonic or photonic resonances.…”

Graphene-based tunable dual-band absorbers by ribbon/disk array

“…The carrier mobility of graphene can be changed by doping methods (chemical or electrostatic doping methods) or by defects creating approaches [6]- [8], and the Fermi level can be modulated in a wide range [9]. Due to the tunability of the carrier mobility of graphene and resulting in its conductivity in the infrared and terahertz ranges, graphene has become one of the most promising materials in many applications such as tunable planar filters [10]- [12], metasurface conformal cloaks [13] and absorbers [14]- [28].…”

“…Recently, the realization of electromagnetic wave (EM) absorbers based on graphene as narrow band [14]- [17], broadband [18]- [23] and multi-band [24]- [28] has attracted the attention of researchers in the THz and mid-infrared (IR) regimes. For the design of the multi-band absorbers, the structures with multi-size patterned elements or asymmetric and complex shapes and the multilayered structures are commonly used.…”

“…In [26] and [27], the metamaterial absorbers consist of two sizes of graphene disks and two cross-shaped metallic resonators of different sizes, respectively. In [28], the absorber is based on two layers of graphene as ribbon and sheet. However, employing the structures with several resonators imposes a complicated fabrication process and therefore designing a simple structure is very important [24].…”