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

Abstract

This article presents two dual-band absorbers based on graphene one dimensional (1D) / two dimensional (2D) patterned arrays in the THz frequencies. In comparison to the previous work, the structure of the proposed device is very simple. Most dual-band absorbers are based on mixing resonances of resonators with different sizes inside the structure. In this paper, the proposed absorber is based on the arrays of one element. Dual capacitive-inductive nature of the graphene patterned array and the impedance matching condition are used to achieve two resonance bands with perfect absorption by adjusting the graphene properties.

High-Q dual-band graphene absorbers by selective excitation of graphene plasmon polaritons: Circuit model analysis

“…In the present paper, the geometrical parameters and graphene properties (the chemical potential and the relaxation time of graphene) are designed in this way that dual-band absorbers can be realized by exciting different GPPs [33] at each resonant frequency. Furthermore, the resonant bands of the proposed absorbers are very narrow band in comparison to our previous work [39,40] and also, the absorption values between two bands is nearly zero.…”

“…These extraordinary features make graphene a promising material for many applications in optical modulators [19][20][21], sensors [22][23][24][25][26], and absorbers [27][28][29][30][31][32][33][34][35][36][37][38][39]. Recently extensive studies are done on the graphene-based absorbers as broadband, multiband, and resonant absorbers [27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Solar energy harvesting [41,42], refractive index sensors [43], microbolometers [44], thermal imaging [45], thermal IR emitters [46], bio-sensing are some promising applications of absorbers.…”

“…In this paper, the patterned array of graphene as onedimensional ribbons and two-dimensional disks are used to design dual-band absorbers. In our previous works [39,40], we used the graphene and metallic patterned arrays to achieve dual-band absorbers by exciting the fundamental GPPs at both bands. In the present paper, the geometrical parameters and graphene properties (the chemical potential and the relaxation time of graphene) are designed in this way that dual-band absorbers can be realized by exciting different GPPs [33] at each resonant frequency.…”

Quad-band tunable graphene-based metamaterial absorber operating at THz frequencies

“…On the other hand, graphene conductivity can be tuned in a wide frequency range at the terahertz band by chemical doping or applying DC voltage. This important feature can underpin the action base of electro-optical devices such as tunable graphene-based absorbers Vasic and Gajic (2013); Barzegar-Parizi (2019), optical modulators Sensale-Rodriguez (2012); Vahed and Ahmadi (2020), tunable graphene-based nanoantenna Reed (2012), and chemical sensors based on graphene . In recent years, multilayer stacking and different size graphene resonators configuration Xia (2018; Li (2019) as two conventional ways are utilized to obtain multi-band absorption.…”

Design of Dual-Band Terahertz Perfect Metamaterial Absorber Based on Circuit Theory

“…However, these works require not only the structure of the complex, but also the corresponding tedious design and fabrication process. Therefore, designing simple structures with an efficient method is of great importance [ 15 , 16 , 17 , 18 , 19 ].…”