http://www.sciencemag.org/news/2016/06/new-material-converts-invisible-infrared-energy-visible-light?utm_source=sciencemagazine&utm_medium=facebook-text&utm_campaign=lettherebelight-4985 The laser fires at a clear film of molecules consisting of tin and sulfur atoms arranged in a diamond-like pattern and surrounded by organic groups. The molecules in the film absorb the IR photons and re-emit that energy as higher-energy visible light photons. via New material converts invisible, infrared energy into visible light | Science | AAAS.