Phys.org   October 18, 2023 Researchers in New Zealand used a small glass bulb containing an atomic vapor to demonstrate a new form of antenna for radio waves. The bulb was “wired up” with laser beams and could therefore be placed far from any receiver electronics. They combined a rubidium vapor cell with a corner-cube prism reflector to form a passive RF transducer, allowing the detection of microwave signals at a location distant from the active components required for atomic sensing. The transducer had no electrical components and was optically linked to an active base station by a pair of free-space […]