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基于纳米天线的多通道高强度定向表面等离子体波激发

熊志成 朱丽霖 刘诚 高淑梅 朱健强

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基于纳米天线的多通道高强度定向表面等离子体波激发

熊志成, 朱丽霖, 刘诚, 高淑梅, 朱健强

High-intensity directional surface plasmonic excitation based on the multi metallic slits with nano-antenna

Xiong Zhi-Cheng, Zhu Li-Lin, Liu Cheng, Gao Shu-Mei, Zhu Jian-Qiang
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  • 设计了一种带有纳米天线的金属微腔结构, 以实现高强度表面等离子的定向激发. 在利用双狭缝结构实现表面等离子体波定向激发的基础上, 分别结合共振增强和干涉相长原理, 在传统结构的入射端面上添加纳米天线结构, 并增加狭缝通道数, 实现了定向激发的表面等离子体波的能量增强. 基于纳米天线的多通道高强度定向表面等离子体波激发装置结构简单, 系统紧凑, 并能够有效提高定向传播的表面等离子体波的能量密度和传播距离, 其对微纳光学传输和高密度光学集成领域等方面的研究具有重要意义.
    Micro-nano structure optical device based on surface plasmon polariton such as super lens, micro-nano resonators and waveguides, etc. owns great applications in different research fields, especially in integrated optics and nanophotonics, for it has extremely small size and can be integrated into a micro-nano optical system. Comparatively, the directional wave exciter attracts much attention since it breaks the symmetries of wave propagation and excitation and can be applied to a micro-nano optical logic modulation system in the future. In order to realize the high-efficiency directional excitation in ultra-small structure based on surface plasmon polariton, a newly designed metal insulator metal waveguide based surface plasmon directional exciter with multiple channels and nano antenna is presented in this paper. The basic structure of the surface plasmon directional exciter is a two-slit metal plate, and the directional propagation surface plasmon wave is generated according to wave interference. To obtain a single surface plasmon wave in the specific orientation, a phase difference of π/2 between the surface waves generated by slits is necessary. To achieve the different phase differences, both heights and widths of the channels are calculated according to the waveguide mode function. It is worth noting that the directional wave exciter with dual channels is able to generate unsymmetrical wave propagation, however, the excitation efficiency is rather low, which restricts its potential applications in micro-nano optical system. In the paper, in order to further raise the coupling efficiency of the excited surface plasmon wave, and increase its propagation, other additional channels are designed in the directional wave exciter structure. Compared with the traditional dual channel system, the additional channels with similar parameters, and the same interference features are introduced in the surface plasmon directional exciter to increase the light transmission and surface wave energy. In addition, a nano antenna structure based on resonance is presented on the structure surface to enhance the surface plasmon excitation as well. The design tactics of the directional surface plasmon wave exciter are analytically explained in the paper. With numerical calculation based on the finite difference time domain method, the simulation result proves that the proposed surface plasmon wave directional exciter is able to generate single orientation surface wave with extremely high coupling ratio. Moreover, with additional multiple channels and nano antenna, the energy of the directional coupled surface plasmon wave is improved obviously, which indicates that the propagation distance of the surface plasmon wave is increased. In the simulation, both the additional channels and nano antenna are able to increase the energy and propagation distance of the surface plasmon wave obviously: the energies of directional propagated surface plasmon waves of four and six channel directional wave exciters with nano antenna are 6.74 times and 9.30 times that of the traditional dual slit directional wave exciter without nano antenna, respectively. Moreover, it is worth noting that the newly designed nano antenna based multi-channel enhanced surface plasmon wave directional exciter owns compact structure and can be easily fabricated at low cost. It is believed that this work can be an important reference for designing micro and nano photonic and plasmonic elements in integrated optics.
      通信作者: 刘诚, cheng.liu@hotmail.co.uk
    • 基金项目: 江苏省自然科学基金(批准号: BK2012548, BK20130162)资助的课题.
      Corresponding author: Liu Cheng, cheng.liu@hotmail.co.uk
    • Funds: Project supported by the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK2012548, BK20130162).
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    Zhang Z, Liu Q, Qi Z M 2013 Acta Phys. Sin. 62 060703 (in Chinese) [张喆, 柳倩, 祁志美 2013 物理学报 62 060703]

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    O'Carroll D M, Hofmann C E, Atwater H A 2010 Adv. Mater. 22 1223

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    [10]

    Gan Q Q, Guo B S, Song G F, Chen L H, Fu Z, Ding Y J, Bartoli F J 2007 Appl. Phys. Lett. 90 161130

    [11]

    Zhou Y J, Cui T J 2011 Appl. Phys. Lett. 98 221901

    [12]

    Lo'pez-Tejeira F, Rodrigo S G, Martin-Moreno L, Garcia-Vidal F J, Devaux E, Ebbesen T W, Krenn J R, Radko I P, Bozhevolnyi S I, Gonzalez M U, Weeber J C, Dereux A 2007 Nat. Phys. 3 324

    [13]

    Lin J, Mueller J P B, Wang Q, Yuan G H, Antoniou N, Yuan X C, Capasso F 2013 Science 340 331

    [14]

    Mueller J P B, Leosson K, Capasso F 2014 Nano Lett. 14 5530

    [15]

    Rodríguez-Fortuõ F J, Marino G, Ginzburg P, O'Connor D, Martínez A, Wurtz G A, Zayats A V 2013 Science 340 328

    [16]

    Zhang Y F, Wang H M, Liao H M, Li Z, Sun C W, Chen J J, Gong Q H 2014 Appl. Phys. Lett. 105 231101

    [17]

    Lu F, Sun L, Wang J, Li K, Xu A S 2014 Appl. Phys. Lett. 105 091112

    [18]

    Lu F, Li K, He Z J, Liu D L, Xu A S 2014 IEEE Photon. Technol. Lett. 26 1730

    [19]

    Wang Y K, Wang J C, Gao S M, Liu C 2013 Appl. Phys. Express 6 022003

    [20]

    Gordon R, Brolo A G 2005 Opt. Express 13 1933

    [21]

    Shi H F, Wang C T, Du C, Luo X G, Dong X C, Gao H T 2005 Opt. Express 13 6815

    [22]

    Cui Y, He S 2009 Opt. Lett. 34 16

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出版历程
  • 收稿日期:  2015-07-19
  • 修回日期:  2015-09-05
  • 刊出日期:  2015-12-05

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