Femtosecond Pulse Propagation in a Symmetric Gap Surface Plasmon Polariton Waveguide  

作　　者：LU Zhi-Xin YU Li LIU Bing-Can ZHANG Kai SONG Gang 逯志欣;于丽;刘炳灿;张恺;宋钢(State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876;School of Science,Beijing University of Posts and Telecommunications,Beijing 100876;Department of Fundamental Courses,Academy of Armored Force Engineering,Beijing 100072)

机构地区：[1]State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876 [2]School of Science,Beijing University of Posts and Telecommunications,Beijing 100876 [3]Department of Fundamental Courses,Academy of Armored Force Engineering,Beijing 100072

出　　处：《Chinese Physics Letters》2011年第8期300-303,共4页中国物理快报（英文版）

基　　金：by the National Basic Research Program of China under Grant No 2010CB923202;the National Natural Science Foundation of China under Grant No 60578043;the Common Construction Program of Beijing Municipal commission of Education under Grant No XK100130937。

摘　　要：We investigate the effect of a symmetric gap surface plasmon polariton(SPP)waveguide on ultrashort pulses with a central wavelength of 850 nm and a width of 20 fs using the finite-difference time-domain method.The length of the waveguide is 560 nm.Linear and nonlinear dielectrics are chosen to be the core layers whose thicknesses are set to be 20,50,100 and 200 nm,respectively.The results show that for the linear case,strong coupling of the SPP mode can lead to the pulse tailing phenomenon and spectrum compression due to waveguide resonance.For the nonlinear case,the output pulse is broadened and the fluctuation is more complex than the input pulse and can induce the spectrum splitting as well.The smaller the thickness of the core layer is,the more distinct the pulse distortion is,which may be due to the combined effects of dispersion,waveguide resonance and self-phase modulation.

关 键 词：WAVEGUIDE FEMTO WAVEGUIDE 

分 类 号：TN2[电子电信—物理电子学]