To Watch:
The New Meta-Materials for Superlenses and Invisibility Cloaks
"A metamaterial has custom-designed micro-structures which give a material new properties. These micro-structures are typically arrays that resonate at specific frequencies, and that interact either with acoustic waves or with electromagnetic waves. This way, metamaterials can be used to control sound, heat, light, and even earthquakes."
http://backreaction.blogspot.com/2022/09/the-new-meta-materials-for-superlenses.html