Graphene induced tunable and polarization-insensitive broadband metamaterial absorber

Tunable Broadband THz Waveband Absorbers Based On Graphene for Digital Coding

“…The conductivity of graphene is provided by Kubo’s equation, which is determined by both intra-band and inter-band transition [ 26 ]: here, , is the Boltzmann’ s constant, is the temperature, is the elementary charge, is the reduced Planck’ s constant, is the angular frequency, is the carrier relaxation time that is a function of carrier mobility , the Fermi energy of graphene and Fermi velocity .…”

Implementation of Atomically Thick Graphene and Its Derivatives in Electromagnetic Absorbers

“…It is noted that, for metasurfaces supporting multiple resonant modes, if the resonant frequencies are designed close enough, the absorption peaks would partly overlap with each other and the device tends to perform as a broadband absorber. For instance, Zhang et al proposed a graphene metasurface absorber utilizing unit cells consist of three metallic circular patches with different diameters, as shown in Figure 7a [111]. From the numerical simulation results, it is easy to see that the device resonates at 33.68 THz, 35.90 THz and 39.65 THz, resulting in an enhanced effective absorption bandwidth compared with the device with a single resonant mode.…”

“…It is worth mentioning that the thick dielectric layer in the range of micrometers used in some of these theoretical calculations are impractical for electrostatic doping [22,27,28,113]. Furthermore, in some works, the effects of interconnecting wires between unit cells for the implementation of external bias voltage have not been taken into consideration, resulting in great uncertainty in the actual performance of the absorbers [22,28,108,111,[129][130][131][132].…”

Design of multispectral tunable metamaterial absorber based on phase transition of VO<sub>2</sub>

“…因此人 们希望能够利用热、电、光等方式来实现超材料吸波 体的主动调节和控制. 2011年, Shen等人 [14] 将半导体Si 与超材料结合设计了一种光控超材料, 通过控制光强 实现了中心频率0.76-0.96 THz的调控; 2017年, Wang 等人 [15] 将InSb作为超材料吸波体的介质, 通过改变温 度使其在太赫兹波段的频率调控范围达到了80.4%左 右; 同年, Zhang等人 [16] [17] .…”