研究目的
To investigate the effects exerted by material and geometrical parameters of a dielectric substrate on linear-to-linear polarization conversion in quasiplanar structures containing two coupled metasurfaces and enabling chirality.
研究成果
Dielectric substrate parameters can strongly affect polarization conversion and asymmetric transmission regimes achievable in low-profile structures comprising two coupled metasurfaces that represent arrays of subwavelength resonant elements. The comparison has been carried out for the structures with and without metallic mesh and, thus, with and without tunneling. It has been demonstrated that sometimes the former and sometimes the latter can be preferable for the practical use. Perfect polarization conversion usually means that asymmetry in transmission is also perfect, and vice versa. This remains true at least if higher diffraction orders in the hosting air space are evanescent.
研究不足
The study is restricted to quasiplanar structures containing two coupled metasurfaces that represent arrays of subwavelength split-ring resonators (SRRs) enabling simple U-type unit cells with resonant behavior at microwave frequencies, and to the case of normal incidence. Zero-loss approximation is utilized to clarify the main components of the underlying physical mechanisms.
