Mathias Kolle, who led the research, said: “We have unlocked one of nature’s secrets and combined this knowledge with state-of-the-art nanofabrication to mimic the intricate optical designs found in nature.
“Although nature is better at self-assembly than we are, we have the advantage that we can use a wider variety of artificial, custom-made materials to optimise our optical structures.
“These artificial structures could be used to encrypt information in optical signatures on banknotes or other valuable items to protect them against forgery.
Next time when we hold a banknote in our hand, please remember to say thank you for butterfly as well. They help us stop counterfeit banknote from circulating. As in Malaysia, many counterfeit new RM50 counterfeit cases emerging everyday. Just make sure you check your money before put them in your wallet.
Source: Telegraph.co.uk, Wikipedia.