Depends on the definition of slowly - thousands of photons per second upwards (and detectors are so sensitive these days that makes seeing easy). Lots of articl

Depends on the definition of slowly - thousands of photons per second upwards (and detectors are so sensitive these days that makes seeing easy). Lots of articles about on the subject, given the potential uses of this system. https://www.cornishlabs.uk/tweezers https://www.cornishlabs.uk/tweezers https://opg.optica.org/oe/fulltext.cfm?uri=oe-29-4-4858 https://opg.optica.org/oe/fulltext.cfm?uri=oe-29-4-4858