Revolutionizing radar: Integrated THz vortex beam emitter for precise rotating target detection

https://phys.org/news/2023-10-revolutionizing-radar-thz-emitter-precise.html

"cost-effective, scalable... spiraling (not just linear) electromagnetic waves with orbital angular momentum... helical twist introducing signature rotational Doppler effect when encountering spinning object... manipulating frequency generates radar measuring rotating object speed with 2% maximum margin error... access resonances in beam emitter cavity enabling vortex beams ±1 topological charges, illuminating rotating object, and resulting echo received by linearly polarized antenna... tactical military defense"