I'm a Nature subscriber; here's some information from the paper: > To record events occurring at subnanosecond scale, currently the most effective approach is

I'm a Nature subscriber; here's some information from the paper: > To record events occurring at subnanosecond scale, currently the most effective approach is to use a streak camera, that is, an ultrafast photodetection system that transforms the temporal profile of a light signal into a spatial profile by shearing photoelectrons perpendicularly to their direction of travel with a time-varying voltage. It references: Guide. to Streak Cameras http://www.hamamatsu.com/resources/pdf/sys/e_streakh.pdf (Hamamatsu Corp., Hamamatsu City, Japan, 2002) From that PDF: > The incident light on the photocathode is converted into a number of electrons proportional to the intensity of the light, so that these four optical pulses are converted sequentially into electrons. They then pass through a pair of accelerating electrodes, where they are accelerated and bombarded against a phosphor screen. The paper does present a new method, but they are still using a streak camera: > To overcome this limitation, here we present CUP (Fig. 1), which can provide 2D dynamic imaging using a streak camera without employing any mechanical or optical scanning mechanism with a single exposure. --- I do not know anything about the topic, so I can't answer any questions. I was fascinated by the paper back in December when it was published---I'm curious to see eventual applications.