Broadband and broadangle SPP antennas based on plasmonic crystals with linear chirp.
Broadband and broadangle SPP antennas based on plasmonic crystals with linear chirp.
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DOI:
10.1038/srep00829
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发表时间:
2012
影响因子:
4.6
通讯作者:
Zayats, A. V.
中科院分区:
文献类型:
--
作者:
Bouillard, J. -S;Vilain, S.;Dickson, W.;Wurtz, G. A.;Zayats, A. V.
Plasmonic technology relies on the coupling of light to surface electromagnetic modes on smooth or structured metal surfaces. While some applications utilise the resonant nature of surface polaritons, others require broadband characteristics. We demonstrate unidirectional and broadband plasmonic antennas with large acceptance angles based on chirped plasmonic gratings. Near-field optical measurements have been used to visualise the excitation of surface plasmon polaritons by such aperiodic structures. These weakly aperiodic plasmonic crystals allow the formation of a trapped rainbow-type effect in a two-dimensional geometry as surface polaritons of different frequencies are coherently excited in different locations over the plasmonic structure. Both the crystal's finite size and the finite lifetime of plasmonic states are crucial for the generation of broadband surface plasmon polaritons. This approach presents new opportunities for building unidirectional, broadband and broad-angle plasmonic couplers for sensing purposes, information processing, photovoltaic applications and shaping and manipulating ultrashort optical pulses.
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影响因子:
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通讯作者:
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