Chin. Phys. Lett.  2011, Vol. 28 Issue (8): 087801    DOI: 10.1088/0256-307X/28/8/087801
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Femtosecond Pulse Propagation in a Symmetric Gap Surface Plasmon Polariton Waveguide
LU Zhi-Xin 1,2, YU Li1,2**, LIU Bing-Can1,2,3, ZHANG Kai1,2, SONG Gang1,2
1State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876
2School of Science, Beijing University of Posts and Telecommunications, Beijing 100876
3Department of Fundamental Courses, Academy of Armored Force Engineering, Beijing 100072
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LU Zhi-Xin, YU Li, LIU Bing-Can et al  2011 Chin. Phys. Lett. 28 087801
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Abstract 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.
Keywords: 78.67.-n      78.68.+m      42.25.-p     
Received: 07 March 2011      Published: 28 July 2011
PACS:  78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)  
  78.68.+m (Optical properties of surfaces)  
  42.25.-p (Wave optics)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/28/8/087801       OR      https://cpl.iphy.ac.cn/Y2011/V28/I8/087801
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LU Zhi-Xin
YU Li
LIU Bing-Can
ZHANG Kai
SONG Gang
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