Floating in nearly any sea or lake are bacteria that scatter sunlight and help darken the deep. But if you shine a strong laser beam into the water, those same bacteria can increase light transmission compared with plain water by assembling into a light-channeling waveguide. A research team has now detected this so-called self-focusing effect not only in marine bacteria but also in other bacteria and in blood cells. Further efforts at controlling the effect could open up new ways of imaging biological samples.
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