Multiple linear-crossing metamaterials for directional refraction

Recently, linear-crossing metamaterials (LCMMs) in the hyperbolic topological transition of iso-frequency contour, have attracted people's great attention. Due to the novel linear dispersion, LCMM provides a new platform to control and enhance the light-matter interactions, such as all-angle negative refraction, filters, super-lens, etc. However, the narrow-band working frequency is currently the major limitation in LCMMs. In this work, we propose two methods to realize multiple linear-crossing metamaterials (MLCMMs), including a basic Drude-Lorenz model and an actual step-like multilayer structure. Especially, in order to identify the designed two kinds of MLCMMs, we numerically demonstrate the unique beam splitting and directional refraction of MLCMM at different frequencies. Our findings may not only provide a new platform for the fundamental study of LCMM, but also facilitate some broadband applications.

Automated summary

The recent advancements in linear-crossing metamaterials (LCMMs) have attracted significant attention due to their ability to control and enhance light-matter interactions, such as negative refraction, filters, and super-lenses, through novel linear dispersion. However, the limited working frequency range remains a major constraint for LCMMs. In this study, we propose two methods to realize multiple linear-crossing metamaterials (MLCMMs) and demonstrate their unique beam splitting and directional refraction properties at different frequencies. This research not only provides a new platform for fundamental LCMM studies but also facilitates broadband applications.