Wonderful site! Includes a comprehensive open-access encyclopedia of photonics and links to suppliers.<p>As to the actual question of storing light, article admits the impracticality of any sort of &quot;box o&#x27; mirrors&quot; approach. Although truthfully it would make a fun experiment. I think nature provides a much more elegant solution in the form of crystals that can absorb and re-emit photons when excited, of which modern tech has made ample use thereof.