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Su Y.,Beihang University | Su Y.,Northern Institute of Electronic Equipment | Zheng Z.,Beihang University | Bian Y.,Beihang University | And 8 more authors.
Journal of Optics (United Kingdom) | Year: 2012

Two types of plasmonic waveguiding structures based on hollow dielectric nanowires are proposed and their modal properties are investigated numerically at a wavelength of 1550nm. The first type of waveguide consists of a high-index hollow nanowire covered directly by a thin metallic film. Depending on the size of the hollow nanowire, such a waveguide could support a plasmonic mode with lower propagation loss than the metal-coated nanowire structures without a hollow core. To further reduce the propagation loss, a second type of waveguide is proposed, which includes an additional low-index silica buffer layer between the metal layer and the hollow nanowire. Simulations reveal that the additional low-index buffer could enable strong hybridization between the dielectric mode and the plasmonic mode, which leads to even lower propagation loss while maintaining nanoscale confinement similar to that of the first type of waveguide. Both of the proposed waveguides are feasible using modern fabrication methods and could facilitate potential applications in integrated photonic components and circuits. © 2012 IOP Publishing Ltd.

Cao H.Y.,National University of Defense Technology | Zhu P.D.,National University of Defense Technology | Bi W.Q.,Northern Institute of Electronic Equipment
Applied Mechanics and Materials | Year: 2014

Network attacks, either in aggressive or silent way, are main threat to network security. Modern network environment normally involves multiple domains, and there are connections between them, so an adversary can impact the important network domain via attacking a normal one. When the threat is found in one domain, there isn't a mean to identify how large scale this threat has spread, and there isn't an effective method to mediate such threat. This paper focused on detecting the real topology of multi-domain network and proposed a cooperative method to mediate the threat propagation. The network topology is identified by tracing the propagation of designed benign worm, and the cooperative method is based on novelly collaborating local firewalls on hosts. Performance evaluation is given at the end of this paper to demonstrate the feasibility and effectiveness of the proposed measure. © (2014) Trans Tech Publications, Switzerland.

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