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Nano Lett. 2012 Nov 14;12(11):5784-90. doi: 10.1021/nl303095s. Epub 2012 Nov 2.

All-optical logic gates based on nanoscale plasmonic slot waveguides.

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State Key Laboratory for Mesoscopic Physics & Department of Physics, Peking University, Beijing 100871, People's Republic of China.


We report realizations of nanoscale integrated all-optical XNOR, XOR, NOT, and OR logic gates using plasmonic slot waveguides based on linear interference between surface plasmon polariton modes. The miniature device size with lateral dimensions smaller than 5 μm, precisely controlled optical phase difference, and quasi-monochromatic surface plasmon polariton modes excited by a continuous wave 830 nm laser beam ensure a high intensity contrast ratio of 24 dB between the output logic states "1" and "0". Compared with previous reported results, the intensity contrast ratio is enhanced 4-fold, whereas the lateral dimension is reduced 4-fold. These compact logic devices are stable, robust, free from environmental impact, and much suitable for practical on-chip applications. These also provide a means to construct all-optical logic devices and nanophotonic processors.

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