[1] [1] BARNES W L,DEREUX A,EBBESEN T W.Surface plasmon subwavelength optics［J］. Nature,2003,424(6950): 824.

[2] [2] GRAMOTNEV D K,BOZHEVOLNYI S I.Plasmonics beyond the diffraction limit［J］.Nature Photonics,2010,4(2): 83.

[3] [3] LU D,LIU Z.Hyperlenses and metalenses for far-field super-resolution imaging［J］.Nature Communications,2012,3:1205.

[4] [4] HAN Z,BOZHEVOLNYI S I.Plasmon-induced transparency with detuned ultracompact Fabry-Perot resonators in integrated plasmonic devices［J］.Optics Express,2011,19(4):3251-3257.

[5] [5] ZHAO C,ZHANG J.Plasmonic demultiplexer and guiding［J］.Acs Nano,2010,4(11):6433-6438.

[6] [6] LINIC S,CHRISTOPHER P,INGRAM D B.Plasmonic-metal nanostructures for efficient conversion of solar to chemical energy［J］.Nature Materials,2011,10(12): 911.

[7] [7] PENDRY J B,MARTIN-MORENO L,GARCIA-VIDAL F J.Mimicking surface plasmons with structured surfaces［J］. Science,2004,305(5685):847-848.

[8] [8] ANKER J N,HALL W P,LYANDRES O,et al.Biosensing with plasmonic nanosensors［J］.Nature Materials,2008,7(6):442-453.

[9] [9] JONES A C,OLMON R L,SKRABALAK S E,et al.Mid-IR plasmonics:near-field imaging of coherent plasmon modes of silver nanowires［J］.Nano Letters,2009,9(7):2553-2558.

[10] [10] FANG N,LEE H,SUN C,et al.Sub-diffraction-limited optical imaging with a silver superlens［J］.Science,2005,308(5721):534-537.

[11] [11] PENDRY J.Playing tricks with light［J］.Science,1999,285(5434):1687-1688.

[12] [12] SHEN X,CUI T J,MARTIN-CANO D,et al.Conformal surface plasmons propagating on ultrathin and flexible films［J］.Proceedings of the National Academy of Sciences,2013,110(1):40-45.

[13] [13] ZHANG W,ZHU G,SUN L,et al.Trapping of surface plasmon wave through gradient corrugated strip with underlayer ground and manipulating its propagation［J］. Applied Physics Letters,2015,106(2):021104.

[14] [14] LIU X,FENG Y,ZHU B,et al.High-order modes of spoof surface plasmonic wave transmission on thin metal film structure［J］.Optics Express,2013,21(25):31155-31165.

[15] [15] WU J J.Subwavelength microwave guiding by periodically corrugated strip line［J］.Progress In Electromagnetics Research,2010,104:113-123.

[16] [16] YIN J Y,ZHANG H C,FAN Y,et al.Direct radiations of surface plasmon polariton waves by gradient groove depth and flaring metal structure［J］.IEEE Antennas and Wireless Propagation Letters,2016,15:865-868.

[17] [17] PAN B C,LIAO Z,ZHAO J,et al.Controlling rejections of spoof surface plasmon polaritons using metamaterial particles［J］. Optics Express,2014,22(11):13940-13950.

[18] [18] ZHOU Y J,YANG B J.A 4-way wavelength demultiplexer based on the plasmonic broadband slow wave system［J］.Optics Express,2014,22(18):21589-21599.

[19] [19] WU J J,HOU D J,LIU K,et al.Differential microstrip lines with reduced crosstalk and common mode effect based on spoof surface plasmon polaritons［J］.Optics Express,2014,22(22):26777-26787.

[20] [20] ZHOU Y J,YANG B J.Planar spoof plasmonic ultra-wideband filter based on low-loss and compact terahertz waveguide corrugated with dumbbell grooves［J］. Applied Optics,2015,54(14):4529-4533.

[21] [21] YE L,ZHANG W,OFORI-OKAI B K,et al.Super subwavelength guiding and rejecting of terahertz spoof SPPs enabled by planar plasmonic waveguides and notch filters based on spiral-shaped units［J］.Journal of Lightwave Technology,2018,36(20):4988-4994.