Abstract
The proposed manuscript represents the easy and analytical approach for designing a tunable multi-band Graphene-based absorber. The crossed-shaped resonators are used in the presented manuscript in near-infrared wavelengths over the wavelength of 1400 nm to 1700 nm. Four modes are included based upon the position of resonators for the reflectance and transmittance behavior analysis. It has enumerated more than 98% of absorption response in all the design structures. The proposed absorber structure is numerically investigated using FEM computational techniques. The absorption behavior of the proposed design is represented for the different chemical potential values, varying dimensions of the centered resonator(g
p
), the varying height of resonators (h
Ag
), the varying height of substrate (h
si
), and for multiple layers of a substrate (Si) with Graphene sheets. The presented paper includes a very simple design, equation, and corresponding RLC circuit model of the multi-band absorber. The RLC model of the equivalent absorber structure is presented in the manuscript for identifying the impedance matching condition to create perfect absorption. The proposed absorber shows the possibilities of designing short-band and wide-band tunable behavior of perfect absorption using graphene silver geometries. The resonance wavelength and absorption bandwidth can be regulated by different physical parameters. The proposed design was also compared with the previously reported work. This design opens new opportunities in solar absorption, optical communication, and bio-sensor-based applications.