Photonic meta-crystals
Shengyu Hu, Pengyu Li, Hong Chen, Zhiwei Guo
Abstract
Photonic crystals (PCs) and metamaterials are periodic artificial structures with different scales that modulate light–matter interactions. Considering their complementary advantages, the concept of photonic meta-crystals is proposed. In these hybrid structures, such as hypercrystals (composed of hyperbolic metamaterials and PCs), the photonic band gap provided by PCs can be blue-shifted with more degrees of freedom, and the weak coupling of hyperbolic metamaterials to the environment can be enhanced. This review introduces photonic meta-crystals in sequence, based on the classification of electromagnetic parameters in metamaterials. Recent advances in photonic meta-crystals are also presented in the context of topological semimetals.