New Solid Material Turns Ordinary Sunlight Into High-Energy UV Light
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Two cups of warm water will never give you one cup of boiling water. Pour them together and you get a larger volume of lukewarm water, nothing more. The energy simply does not pool that way. And yet, down at the scale of single particles of light, that is more or less exactly what a team in Japan has just pulled off in a solid block of material, under nothing fancier than the sun.
The trick is called photon upconversion, and the idea is to take two low-energy photons of visible light and fuse th
The trick is called photon upconversion, and the idea is to take two low-energy photons of visible light and fuse th
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