A multi-layer absorber using multi-bias arrays of graphene is proposed. The design methodology using the equivalent circuit model and matching concept is described. A heavy optimization process is performed to optimize bias values for different functionality. Leveraging, increased control parameters due to multi-bias scheme and simple circuit model representation, two operational modes are achieved as wide-band and multiband absorption. The proposed absorber can perfectly absorb THz incident waves between 5:2 THz À 6:3 THz in wide-band mode while shows perfect absorption response in 5:3 THz; 7:5 THz; 8 THz; 8:5 THz; 9 THz; and 9:5 THzin multi-band operational mode. Besides, response dependency to layers thicknesses, electron relaxation time, chemical potentials, and incident angle are reported to express acceptable sensitivity of the device. Such a reconfigurable absorber is in demand for several applications, ranging from medical imaging to indoor communication.
Wave absorbers are considered main operational block for light manipulation. Numerous optical and electromagnetic systems can be realized via wave absorbers such as wave modulators, filters, and detectors. Here in this work, a highly tunable wave absorber is proposed, which includes three layers of grapheme patterns on dielectric. While whole device is placed on top of a relatively thick metallic reflector. Leveraging dual bias scheme for periodic arrays of grapheme ribbons and exploiting impedance matching concept give the opportunity to adjust absorption response via external bias voltages. All consisting parts of the device are modeled by passive circuit elements include resistor, inductor, and capacitor. Compared to conventional methods of full wave numerical modeling like finite element methods, the presented design methodology requires less CPU time and occupied memory. According to the simulation results, proposed wave absorber shows a multi‐band absorption with four peaks, which make it perfect choice for several application from medical imaging to indoor communication.
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