Topologically structured light detects the position of nano-objects with atomic resolution

https://phys.org/news/2023-05-topologically-position-nano-objects-atomic-resolution.html

"characterize systems or phenomena scale of fraction of billionth of meter... atomic scale metrology collecting single-shot images diffraction pattern topologically structured light with wavelength λ = 488 nm scattered on suspended nanowire 17-μm-long 200-nm-wide, to determine position relative to fixed edges of sample... subatomic precision 92 pm (i.e., around λ/5,300), while the nanowire naturally thermally oscillated with amplitude of ∼150 pm. For reference, a silicon atom is 220pm in diameter"