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2 September 2009 Transient surface plasmon polariton launched by a metal subwavelength slit scattering
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We present a rigorous closed-form solution to complete the fundamental theory on the transient surface plasmons polaritons (SPP) present on a metal interface, in addition to the conventional long-range SPP, launched by scattering of a metal subwavelength slit. We demonstrate that the Maxwell equations solution includes a transit SPP with complexvalued Exponential Integral envelope by computing the Sommerfeld branch-cut integrals. Physically, the transient SPP is the cylindrical wave initially radiated from the source line, which losses its energy to pumping the long-range SPP mode in the propagation. Its varying damping rate is comparable with existing numerical and approximate results.
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Yann Gravel and Yunlong Sheng "Transient surface plasmon polariton launched by a metal subwavelength slit scattering", Proc. SPIE 7395, Plasmonics: Nanoimaging, Nanofabrication, and their Applications V, 73950V (2 September 2009);

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