There may be plenty of room at the bottom, but the size of conventional optical elements is restricted by the diffraction limit of light. Plasmon waveguides made from metal nanoparticle chains may allow a drastic reduction in the size of photonic devices.
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Krenn, J. Watching energy transfer. Nature Mater 2, 210–211 (2003). https://doi.org/10.1038/nmat865
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