Hole-Based Stealthy Hyperuniform Semiconductor Metamaterials for the Mid-Infrared

Stealthy hyperuniform heterostructures are a novel type of metamaterial with the potential for optical image processing at angles away from normal incidence. These metamaterials show analogous properties to photonic crystals while circumventing the spatial anisotropy often hindering the latter's use. In this paper, we have successfully designed, fabricated, and characterized a hole-based stealthy hyperuniform structure on a quantum cascade layer substrate. The infrared spectral data reveal a sizable gap-midgap ratio of 9.8% for a photonic band gap around $12.0 ~\mu m$ in the form of an enhanced reflection region for increasing incidence angles. The stealthy hyperuniform metamaterial also showed spatial isotropy by its unchanging reflection spectrum for all in-plane rotational angle measurements.