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

Su Xu, Jian-Bin Liu, Hao Wang, Ci-Kang Su, Hong-Bo Sun,

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-44-4-927&origin=search

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

Abstract-Propagation of electromagnetic fields in bulk terahertz metamaterials: Combined experimental and theoretical study

http://prb.aps.org/accepted/fa077OecL541151c883286b1117d2dbf8361aec5a

Rasoul Alaee, Christoph Menzel, Agnieszka Banas, Krzysztof Banas, Su Xu, Hongsheng Chen, Herbert O. Moser, Falk Lederer, and Carsten Rockstuhl

Accepted Monday Jan 28, 2013

The availability of novel technologies that enable the fabrication of bulk metamaterials made it necessary to develop a theoretical language to discuss their properties appropriately. Here, we use, for the first time, the fundamental Bloch mode approximation to explore bulk properties of metamaterials that operate at terahertz frequencies. We demonstrate that this approximation is valid in the case of THz meta-foil metamaterials. While relying on theoretical and experimental results, we show that the fundamental Bloch mode approximation can explain minuscule details that are unique to the bulk metamaterial. Various applications such as cylindrical lenses, terahertz cloaks and sensors will benefit from our analysis.