Surface Plasmon Polariton Enhancement in Silver Nanowire–Nanoantenna Structure
The surface plasmon polariton (SPP) coupling and enhancement in silver nanowire–nanoantenna structure is proposed and simulated by using finite difference time domain method. The results demonstrate that three-arm antenna can effectively enhance the coupling efficiency at the incident end and the SPP field intensity at the emission end. The enhancement factor, which is defined as the ratio of the SPP field intensity at the emission end with and without the three-arm antenna, for the various antenna arm lengths and incident wavelengths under different incident angles are calculated. The suggested structure can be served as an enhanced plasmonic waveguide for the nanophotonic and plasmonic circuits in the future.
KeywordsSurface plasmon polariton Waveguide Metal optics Subwavelength structure
The work is supported by National Science Foundation of China (10574002), National Basic Research Program of China (973 Program; 2007CB936800), and Undergraduate Scientific Training Program Funding of Peking University.
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