title: All-optical logic gates based on nanoscale plasmonic slot waveguides.
abstract: 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.
authors.affiliation: State Key Laboratory for Mesoscopic Physics & Department of Physics, Peking University, Beijing 100871, People's Republic of China.
authors.forename: Yulan
authors.initials: Y
authors.lastname: Fu
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Hu
authors.forename: Cuicui
authors.initials: C
authors.lastname: Lu
authors.forename: Song
authors.initials: S
authors.lastname: Yue
authors.forename: Hong
authors.initials: H
authors.lastname: Yang
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong