Researchers identify new method to boost laser processing resolution

https://phys.org/news/2024-03-method-boost-laser-resolution.html

"ultra-short pulse laser vector beam focuses on laser beam with radial polarization, generating longitudinal electric field at the focus, producing a smaller spot... prevent use limiting light refraction at air-material interface employing oil immersion objective lens... longitudinal field enhanced... enables direct material processing with enhanced precision using enhanced longitudinal electric field... processing scales below 100 nm... nano-machining: automotive, semiconductor, medical"