Researchers uncover a new method for generating spinning thermal radiation

https://phys.org/news/2023-02-uncover-method-generating-thermal.html

"array of F-shaped metasurface generate predominantly left-handed circularly polarized thermal radiation in all directions, resulting in non-vanishing optical helicity for first time... reached 39% of limit in optical helicity...  effective control over thermal radiation... wide-angle, narrow-band circular-polarized mid-infrared light source for optical gas sensing and infrared imaging... passive infrared beacons in outdoor environments for use in remote sensing... thermal imaging and communication"

Related: Researchers: We've created a new lens that could take thermal cameras out of spy films and put them in your back pocket

https://techxplore.com/news/2023-06-weve-lens-thermal-cameras-spy.html