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We demonstrate that planar metamaterial lacking of mirror symmetry shows asymmetric transmission of terahertz waves and bands of positive, negative and zero phase and group velocities indicating a polarization sensitive negative index and slow-light media.
We determine the rigorously calculated scattered field of meta-atoms and decompose it into spherical harmonics with complex amplitudes. Transforming these spherical harmonics into a Cartesian base reveals all multipole moments in this coordinate system, i.e. all electric and magnetic dipole, quadrupole and any higher order moments can be completely determined. We show that these multipole moments...
A new class of bulk metamaterials is proposed, which are assembled of functional layers with differing layout properties, as shown in the figure. These enhanced degrees of freedom allow to design metamaterials, which perform optically in a predefined manner. We apply this approach to design isotropic metamaterials and metamaterials in which light propagates free of diffraction.
Based on a systematic analysis of the symmetry properties of metamaterial unit cells, we show experimentally and theoretically that asymmetric transmission for linearly polarized, visible light can be observed for suitably designed unit cells.
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