This is the sort of article that gets me thinking. For example, if you had a room completely composed of perfectly reflective mirrors (walls, ceiling, floor) and you flicked a light off and on, would the room ever get dark again? Somewhere, I'm sure, somebody has tried this. Anyhow, this article is about the use of light particles (photons) instead of electrons for data processing. "Photonic crystals -- tiny cages or honeycombs constructed of silicon -- trap, guide and switch light much the way semiconductors manipulate electrons in today's computers." The technology promises a next generation of computer systems - and capacity far beyond what we can imagine today.
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