FEATHERS AND BUTTERFLY WING SCALES, as well as beetle shells, are known for their complex photonics, but their refractive indexes are all positive. Metamaterials do seem to create a negative refractive index that not known in nature, thus far.
https://lnkd.in/eRSFeKH
linkedin post 2022-06-29 05:12:48
Nigel Fleming
September 21, 2022