Scientists use ‘negative light’ to send secret messages hidden inside heat: Using a phenomenon called “negative light,” scientists invisibly transferred data disguised as background thermal radiation.

Scientists use ‘negative light’ to send secret messages hidden inside heat: Using a phenomenon called “negative light,” scientists invisibly transferred data disguised as background thermal radiation.

https://www.livescience.com/physics-mathematics/scientists-use-negative-light-to-send-secret-messages-hidden-inside-heat