[1] [1] Falk A L, Koppens F H L, Yu C L, et al.. Near-field electrical detection of optical plasmons and single-plasmon sources[J]. Nature Physics, 2009, 5(7): 475-479.

[2] [2] Barnes W L, Dereux A, Ebbesen T W. Surface plasmon subwavelength optics[J]. Nature, 2003, 424(6950): 824-830.

[3] [3] Bozhevolnyi S I, Volkov V S, Devaux E, et al.. Channel plasmon subwavelength waveguide components including interferometers and ring resonators[J]. Nature, 2006, 440(7083): 508-511.

[4] [4] Wang Wentao, Liu Jianjun, Hong Zhi. Multiband terahertz filter based on three nested closed rings[J]. Acta Optica Sinica, 2013, 33(3): 0323001.

[5] [5] Yun Binfeng, Hu Guohua, Cui Yiping. Polymer micro-ring resonator filter with high quality factor[J]. Acta Optica Sinica, 2011, 31(10): 1013002.

[6] [6] Zhang Zhidong, ZhaoYanan, Lu Dong, et al.. Numerical investigation of the metal-insulator-metal waveguide filter based on the arcshaped resonator[J]. Acta Phys Sin, 2012, 61(18): 187301.

[7] [7] Sun Xianming, Liu Wangqiang, Wang Haihua, et al.. Study on resonant models in two-layer micro-sphere cavity[J]. Acta Optica Sinica, 2013, 33(5): 0529001.

[8] [8] Dionne J A, Sweatlock L A, Atwater H A. Plasmon slot waveguides: Towards chip-scale propagation with subwavelength-scale localization [J]. Phys Rev B, 2006, 73(3): 035407.

[9] [9] Veronis G, Fan S. Bends and splitters in metal-dielectric-metal subwavelength plasmonic waveguides[J]. Appl Phys Lett, 2005, 87(13): 131102.

[10] [10] Gao Hongtao, Shi Haofei, Wang Changtao, et al.. Surface plasmon polariton propagation and combination in Y-shaped metallic channels [J]. Opt Express, 2005, 13(26): 10795-10800.

[11] [11] Han Z H, Liu L, Forsberg E. Ultra-compact directional couplers and Mach–Zehnder interferometers employing surface plasmon polaritons [J]. Opt Commun, 2006, 259(2): 690-695.

[12] [12] Han Zhonghua, He Sailing. Multimode interference effect in plasmonic subwavelength waveguides and an ultra-compact power splitter [J]. Opt Commun, 2007, 278(1): 199-203.

[13] [13] Hosseini A, Massoud Y. Nanoscale surface plasmon based resonator using rectangular geometry[J]. Appl Phys Lett, 2007, 90(18): 181102.

[14] [14] Wang Guoxi, Lu Hua, Liu Xueming, et al.. Tunable multi-channel wavelength demultiplexer based on MIM plasmonic nanodisk resonators at telecommunication regime[J]. Opt Express, 2011, 19(4): 3513-3518.

[15] [15] Lin Xianshi, Huang Xuguang. Tooth-shaped plasmonic waveguide filters with nanometeric sizes[J]. Opt Lett, 2008, 33(23): 2874-2876.

[16] [16] Lu Hua, Wang Guoxi, Liu Xueming. Manipulation of light in MIM plasmonic waveguide systems[J]. Chinese Sci Bull, 2013, 58(30): 3607-3616.

[17] [17] Peng Xiao, Li Hongjiang, Wu Caini, et al.. Research on transmission characteristics of aperture-coupled square-ring resonator based filter[J]. Opt Commun, 2013, 294: 368-371.

[18] [18] Liu Ye, Zhou Fei, Yao Bo, et al.. High-extinction-ratio and low-insertion-loss plasmonic filter with coherent coupled nano-cavity array in a MIM waveguide[J]. Plasmonics, 2013, 8(2): 1035-1041.

[19] [19] Wang Tongbiao, Wen Xiewen, Yin Chengping, et al.. The transmission characteristics of surface plasmon polaritons in ring resonator[J]. Opt Express, 2009, 17(26): 24096-240101.

[20] [20] Yun Binfeng, Hu Guohua, Cui Yiping. Theoretical analysis of a nanoscale plasmonic filter based on a rectangular metal–insulator–metal waveguide[J]. 2010, J Phys D: Appl Phys, 43(38): 385102.

[21] [21] Guo Yinghui, Yan Lianshan, Pan Wei, et al.. A plasmonic splitter based on slot cavity[J]. Opt Express, 2011, 19(15): 13831-13838.

[22] [22] Chen Li, Lu Ping, Tian Ming, et al.. A subwavelength MIM waveguide filter with single-cavity and multi-cavity structures[J]. Optik, 2013, 124(18): 3701-3704.

[23] [23] Liu Ye, Zhon Fei, Yao Bo, et al.. High-extinction ratio and low insertion loss plasmonic filter with coherent coupled nano-cavity array in a MIM waveguide[J]. Plasmonics, 2014, 8(2): 1035-1041.

[24] [24] Jiang Yongxiang, Liu Binghong, Zhu Xiaosong, et al.. Study of silver coated hollow-core fiber surface plasmon resonance sensor[J]. Acta Optica Sinica, 2014, 34(2): 0223004.

[25] [25] Kekatpure R D, Hryciw A C, Barnard E S, et al.. Solving dielectric and plasmonic waveguide dispersion relations on a pocket calculator [J]. Opt Express, 2009, 17(26): 24112-24129.

[26] [26] Liu Jianlong, Fang Guangyu, Zhao Haifa, et al.. Plasmon flow control at gap waveguide junctions using square ring resonators[J]. J Phys D: Appl Phys, 2010, 43(5): 055103.

[27] [27] Johnson P B, Christy R W. Optical constants of the noble metals[J]. Phys Rev B, 1972, 6(12): 4370–4379.

[28] [28] Kim K Y, Cho Y K, Tae H S, et al.. Light transmission along dispersive plasmonic gap and its subwavelength guidance characteristics [J]. Opt Express, 2006, 14(1): 320-330.

[29] [29] Zhang Z D, Wang H Y, Zhang Z Y. Fano resonance in a gear shaped nanocavity of the metal-insulator-metal waveguide[J]. Plasmonics, 2013, 8(2): 797-801.