First hollow-core fiber that selectively guides optical vortices depending on their helicity promises optical advances

https://phys.org/news/2025-03-helically-dichroic-hollow-core-fiber.html

"optical elements have not demonstrated high levels of discrimination distinguishing optical vortice helicity...  new hollow-core waveguide exhibits strong helical dichroism, as optical attenuation depends on guided light's orbital angular momentum... waveguide transmits optical vortices with specific helicity/ largely attenuates vortices with opposite helicity... can also be designed for spectral regions inaccessible using other optical systems... chiral sensing, vortex mode generation, optical communications"