5.6 Polarization-Independent Zero-Index Metamaterial
127
Fig. 5.9 Polarization-independent metamaterial proposed by Wang et al. [112]
5.6 Polarization-Independent Zero-Index Metamaterial
Wang et al. reported full polarization Dirac dispersion in photonic hypercrystals
made by drilling air columns in an elliptic metamaterial. In other words, the structure reported by them is a polarization-independent zero-index metamaterial, exhibiting triple-degenerate Dirac point. The elliptic metamaterial is anisotropic in terms
of permittivity host = ( , , ⊥ ), with = 15.47 and ⊥ = 12.45. The authors
claim that such metamaterial can be constructed by layer-by-layer arrangement of
natural materials [112]. The structure being a polarization-independent zero-index
metamaterial, exhibited the property of directional radiation and the phenomenon of
electromagnetic cloaking. This ZIM design is a significant landmark in the evolution
of zero-index metamaterials (Fig. 5.9).
These were a few chief developments that have taken place in the arena of zeroindex photonics and are worth mentioning. Besides these, there have been several
lesser known yet important findings from time to time. We believe that, if substantially evolved, the zero-index photonics is capable of revolutionizing the photonic
technology of the future.
127
Fig. 5.9 Polarization-independent metamaterial proposed by Wang et al. [112]
5.6 Polarization-Independent Zero-Index Metamaterial
Wang et al. reported full polarization Dirac dispersion in photonic hypercrystals
made by drilling air columns in an elliptic metamaterial. In other words, the structure reported by them is a polarization-independent zero-index metamaterial, exhibiting triple-degenerate Dirac point. The elliptic metamaterial is anisotropic in terms
of permittivity host = ( , , ⊥ ), with = 15.47 and ⊥ = 12.45. The authors
claim that such metamaterial can be constructed by layer-by-layer arrangement of
natural materials [112]. The structure being a polarization-independent zero-index
metamaterial, exhibited the property of directional radiation and the phenomenon of
electromagnetic cloaking. This ZIM design is a significant landmark in the evolution
of zero-index metamaterials (Fig. 5.9).
These were a few chief developments that have taken place in the arena of zeroindex photonics and are worth mentioning. Besides these, there have been several
lesser known yet important findings from time to time. We believe that, if substantially evolved, the zero-index photonics is capable of revolutionizing the photonic
technology of the future.