A Caltech press release from the Harry Atwater group touts a nanocrystal-based approach to creating photons in silicon structures, published in Nature Materials. A nanobead's size regulates the frequency of photon created, and the small size also makes it possible to inject single electrons and single holes to make photons one at a time - VERY useful for quantum computing.
The press release doesn't discuss the critical technical details of how accurately we can control the timing of the recombination of the electron and hole to create a photon - we want this in attoseconds, if possible, femtoseconds for sure. The other big question is how the direction of emission can be controlled.
I haven't read the actual paper yet, am looking forward to it...
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