Photonic crystals are exotic materials with the ability to guide light beams through confined spaces and could be vital components of low-power computer chips that use light instead of electricity. Cost-effective ways of producing them have proved elusive, but researchers have recently been turning toward a surprising source for help: DNA molecules.
This isn't directly relevant to my current work, but I like to keep an eye on the tech horizon. Optical computing has been the subject of speculation and experimentation for quite a while. It's looking like it may not stay speculative and experimental much longer.