Metamaterials used to create two-part optical security features

Researchers have developed advanced optical security features that use a two-piece metamaterial system to create a difficult-to-replicate optical phenomenon. The new security features could offer improved forgery protection for high-value products or banknotes and enhance encryption of information such as pin numbers that are physically sent to recipients.

from Top Technology News -- ScienceDaily https://ift.tt/2AcmB59