A new optical metamaterial makes true one-way glass possible

https://phys.org/news/2024-02-optical-metamaterial-true-glass.html

"nonreciprocal magnetoelectric (NME) effect: link between tailored metamaterials' and metasurfaces' magnetization and polarization and different field components of light or other electromagnetic waves... enhanced using metamaterials and metasurfaces because of potential unlocks, created with existing technology... obviates need for strong external magnetic field... more efficient solar cells blocking thermal emissions existing cells radiate back toward sun reducing energy they capture"