Layer-by-Layer Design of Bianisotropic Metamaterial and Its Homogenization

Abstract

Abstract-In this paper, we study the design and homogenization of bianisotropic metamaterials originated from planar split-ring resonators, which would potentially meet the requirements of the emerging photonic topological insulators and some other types of extotic photonic materials with nontrivial states. We show that the off-diagonal elements in the magneto-electric tensor can be realized by combining the planar split-ring resonators with different orientations. To ease the fabrication process, a layer-by-layer design of metamaterials with desired bianisotropy is proposed. The design and homogenization procedure of such metamaterials are verified through effective parameter retrieval approach and computer based simulation. With the proposed structure, the complex magneto-electric coupling is realized in layered structures through planar techniques, which may be useful in the terahertz and optical range.

Spin Hall effect of transversely spinning light

“…( B ) Numerically calculated equifrequency contours in the k x - k y plane. ( C ) Effective constitutive parameters of the MM, which are obtained through the medium parameter retrieval method ( 43 – 46 ), with applying reflection/transmission coefficients. Real: real part; Imag: imaginary part.…”

“…Furthermore, if we consider the small size of the unit cell, then it is evident that such an MM can behave as a homogeneous medium in the band of interest. Here, by using the reflection/transmission coefficients (the S parameters), the effective constitutive parameters ( z ,  x ,  y , and ) relevant to the TE polarized waves are retrieved through the algorithm reported in (43)(44)(45), which are shown in Fig. 3.…”

Transverse photon spin of bulk electromagnetic waves in bianisotropic media

“…2a and the parameter-retrieval approach (Fig. 2c) [37][38] . The bianisotropy vector for this specific configuration is given by ., which is indicated in Fig.…”

Giant Asymmetric Radiation from an Ultrathin Bianisotropic Metamaterial

“…At frequencies above 4 GHz, 11 S and 22 S differ, which is a sign of asymmetrical EM responses for lossy materials; hence, enhanced bianisotropy is expected. By applying the retrieval approach, [44,45] the effective parameters can be reasonably derived; the results are presented in Figure 2(c). In Figure 2(d), the effective index of refraction in the y direction is shown.…”