Polarization-State Modulation in Fano Resonant Graphene Metasurface Reflector

Abstract

An efficient nonlinear contrast source inversion scheme for electromagnetic imaging of sparse two-dimensional investigation domains is proposed. To avoid generating a sequence of linear sparse optimization problems, the non-linearity is directly tackled using the nonlinear Landweber (NLW) iterations. A self-adaptive projected accelerated steepest descent (A-PASD) algorithm is incorporated to enhance the efficiency of the NLW iterations. The algorithm enforces the sparsity constraint by projecting the result of each steepest descent iteration into the L 1 -norm ball and selects the largest-possible iteration step without sacrificing from convergence. Numerical results, which demonstrate the proposed scheme's accuracy, efficiency, and applicability, are presented.INDEX TERMS Contrast source inversion, electromagnetic imaging, inverse problems, Landweber iterations, nonlinear inverse scattering, sparse reconstruction, steepest descent algorithm

Artificial Surfaces and Media for Electromagnetic Absorption and Interference Shielding

“…Lately, there is an emphasis in the scientific community to design efficient plasmonic metamaterial-based absorbers. Light matter interaction in subwavelength metamaterial structures allowed various other applications including perfect lenses [45,97], chiral surfaces [98,99], transformational surfaces [100,101], optical cloaking [100,102,103], spatial light switching [104,105] and IR camouflage and microwave antennas because of certain useful characteristics [96]. In addition to these applications, the perfect metamaterial absorber (PMA) is designed as a tool to efficiently absorb electromagnetic waves utilizing plasmonic resonator elements embedded within its assembly.…”

“…(c) Description of polarization state modulation of a digital M-level signal by chiral graphene metasurface. The 4-level digital stream is fed to a limiter that converts it into the required chemical potential and consequently produces desired polarization state for the reflected field [98]. (d) The chiral biosensor is constructed by graphene metasurface supporting chiral reflection characteristics to test ligand-antigen bindings on the surface.…”

“…Full-wave electromagnetic simulations demonstrate that the absorption spectrum is not only tunable but can be optimized to a large bandwidth of operation, i.e., 6.9 THz bandwidth is obtained for over 90% normalized absorption. Figure 13(c) shows a schematic illustration of the design of graphene metasurface supporting polarization state modulation with high spectral efficiency [98]. The structural chirality of metasurface is utilized to generate chiral reflection along with highly dispersive Fano resonance.…”

Recent Topics in Electromagnetic Compatibility

“…Lately, there is an emphasis in the scientific community to design efficient plasmonic metamaterial-based absorbers. Light matter interaction in subwavelength metamaterial structures allowed various other applications including perfect lenses [45,97], chiral surfaces [98,99], transformational surfaces [100,101], optical cloaking [100,102,103], spatial light switching [104,105] and IR camouflage and microwave antennas because of certain useful characteristics [96]. In addition to these applications, the perfect metamaterial absorber (PMA) is designed as a tool to efficiently absorb electromagnetic waves utilizing plasmonic resonator elements embedded within its assembly.…”

Multi-Channel Near-Field Terahertz Communications Using Reprogrammable Graphene-Based Digital Metasurface

“…Moreover, Surface Plasmon Polaritons (SPP) waves supported by graphene in the mentioned frequencies results in miniaturization of devices. Consequently, graphene has been conceptually assessed in a myriad of metasurface applications such as absorbers [20], nanoantennas [10], polarization-state modulation [21], and ultrasensitive biosensors [22].…”