Illusion mechanisms with cylindrical metasurfaces: A general synthesis approach

Abstract

We explore the use of cylindrical metasurfaces in providing several illusion mechanisms including scattering cancellation and creating fictitious line sources. We present the general synthesis approach that leads to such phenomena by modeling the metasurface with effective polarizability tensors and by applying boundary conditions to connect the tangential components of the desired fields to the required surface polarization current densities that generate such fields. We then use these required surface polarizations to obtain the effective polarizabilities for the synthesis of the metasurface. We demonstrate the use of this general method for the synthesis of metasurfaces that lead to scattering cancellation and illusion effects, and discuss practical scenarios by using loaded dipole antennas to realize the discretized polarization current densities. This study is the first fundamental step that may lead to interesting electromagnetic applications, like stealth technology, antenna synthesis, wireless power transfer, sensors, cylindrical absorbers, etc. II. PROBLEM FORMULATION AND BOUNDARY CONDITIONSAn electromagnetic metasurface is commonly understood as a composite layer composed of infinite number of subwavelength-sized inclusions which are densely ar-arXiv:1905.08341v1 [physics.app-ph]

Optically and radio frequency (RF) transparent meta-glass

“…It is worth noting here that the effect of induced normal and tangential components of electric and magnetic polarization moments on the metasurface boundary conditions has been studied extensively [34][35][36][37]. It has been established that the normal components of EM properties are redundant to the design of far-field responses of a metasurface structure.…”

“…The quasi-optical microwave apparatus consisted of a Vector Network Analyzer (VNA), two k-band antennas, and confocal lenses optimized to operate at (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38) GHz (Figure 8b). The Gaussian beam-waist (beam width of 4 cm) is located at the centre, where the sample is positioned, and is designed to cover 10 hexagonal unit cells and is small enough so as to avoid any spillover of the incident wave on the 10 × 10 cm sample [38] (Figure 8b).…”

Application of cylindrical IE-GSTC to physical metasurfaces

“…Previous works in this approach include the application of Finite Difference Frequency Domain (FDFD) method [8] and Finite Element Method (FEM) [9] to the modeling of planar GSTCs. Even though most of the metasurfaces reported to date are planar, other canonical shapes such as cylindrical metasurfaces [10]- [13] and spherical metasurfaces [14], [15] are now being studied. Applications of conformal metasurfaces include illusion transformation [13], cloaking [12], high-gain antennas [16] and so on.…”

“…Even though most of the metasurfaces reported to date are planar, other canonical shapes such as cylindrical metasurfaces [10]- [13] and spherical metasurfaces [14], [15] are now being studied. Applications of conformal metasurfaces include illusion transformation [13], cloaking [12], high-gain antennas [16] and so on. GSTCs-bianisotropic susceptibility tensor model had been previously used for conformal metasurfaces.…”

Application of cylindrical IE-GSTC to physical metasurfaces

“…Previous works in this approach include the application of a Finite Difference Frequency Domain (FDFD) method [8] and a Finite Element Method (FEM) [9] to the modeling of planar GSTCs. Even though most of the metasurfaces reported to date are planar, other canonical shapes such as cylindrical metasurfaces [10]- [13] and spherical metasurfaces [14], [15] are now being studied. Applications of conformal metasurfaces include illusion transformation [13], cloaking [12], high-gain antennas [16] and so on.…”