Bending light backward (negative refraction) using natural chromium sulfide bromide rather than complex, engineered metamaterials

https://www.eurekalert.org/news-releases/1115460

"unique internal magnetic alignment dictates how light travels through it, causing light bending backward when magnetic order active...miniature lens focuses light into extremely small spots on material whose optical properties toggled/ tuned using magnets or temperature change, refracting light... high-resolution imaging (medical), telecommunications, tiny/ efficient data processing optical components, quantum computers, high-tech manufacturing"