Physicists develop a perfect light trap

https://phys.org/news/2022-08-physicists.html

"two partial beams overlap... light blocks itself... partially transparent mirror... reflect large part of light, reflection  rendered impossible by other part of beam... mirror, used to be partially transparent, now completely transparent for incident laser... creates one-way light... can enter system... no longer escape because of superposition... reflected portion and portion guided through system in circle... light... absorbed... laser beam swallowed up by thin layer that would otherwise allow most beam pass through"