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Three-dimensional metacrystals with a broadband isotropic diamagnetic response and an all-angle negative index of refraction

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Abstract

Metamaterials (MMs) and photonic crystals (PhCs) exhibiting artificially engineered physical properties have been widely studied in the past decade. However, abnormal properties could only be proposed under a limited range of polarization and directions in most of the previous studies. It is still a challenge to realize an isotropic artificial material with multiple exotic electromagnetic properties. Here we report a three-dimensional metacrystal supporting full polarization and omni-directional incidence. The center-symmetric unit cell consists of non-resonant closed metallic loops on each surface of the dielectric cube. With the cross-scale dispersion engineering, the metacrystal can exhibit an isotropic diamagnetic response and an all-angle negative index of refraction simultaneously at the opposite sides of the MM-PhC transition region. An additional numerical analysis shows the good performance in terahertz and mid-infrared frequencies, which indicates its potential applications on multi-functional optical components with wide polarization-and-direction allowance.

© 2019 Optical Society of America

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Supplementary Material (6)

NameDescription
Visualization 1       The electrical field distribution of a plane wave encountering the triangular metacrystal prism at 8.5 GHz.
Visualization 2       The electrical field distribution of a plane wave encountering the triangular metacrystal prism at 12.5 GHz.
Visualization 3       The electrical field distribution of a plane wave encountering normally the square metacrystal slab at 8 GHz.
Visualization 4       The electrical field distribution of a plane wave encountering normally the square metacrystal slab at 12.5 GHz.
Visualization 5       The electrical field distribution of a plane wave encountering obliquely the square metacrystal slab at 8 GHz.
Visualization 6       The electrical field distribution of a plane wave encountering obliquely the square metacrystal slab at 12.5 GHz.

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Figures (6)

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