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9 October 2021 Spatiotemporal imaging of weakly excited femtosecond SPP based on space-dependent-quantum channel effect
Zhenlong Zhao, Boyu Ji, Xiaowei Song, Peng Lang, Yulu Qin, Jingquan Lin
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Proceedings Volume 11904, Plasmonics VI; 1190412 (2021) https://doi.org/10.1117/12.2600777
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China
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Abstract
Accurately capturing the spatiotemporal information of surface plasmon polaritons (SPPs) is the basis for expanding SPPs applications. We record time-resolved nonlinear photoemission electron microscopy (TR-PEEM) images of weakly excited femtosecond SPPs launched from a rectangular trench milled into a flat silver film. Experimental results show that the overall photoelectron yield is greatly enhanced (typically 6-fold enhancement with the comparison of that without 400nm pulse) in this configuration. The spatiotemporal evolution of SPP can be easily investigated with its carrier wavelength, group velocityand phase velocity. The improvement of photoemission yield is interpreted by the quantum pathway for two-color with changing the nonlinear for photoemission. It is found that the contrast between bright and dark fringes of SPPs is significantly improved compared to the single-color scheme due to the improvement of quantum pathway channels for photoemission. These findings complete the underlying physics of two-color PEEM optimized SPP spatiotemporal imaging.
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Zhenlong Zhao, Boyu Ji, Xiaowei Song, Peng Lang, Yulu Qin, and Jingquan Lin "Spatiotemporal imaging of weakly excited femtosecond SPP based on space-dependent-quantum channel effect", Proc. SPIE 11904, Plasmonics VI, 1190412 (9 October 2021); https://doi.org/10.1117/12.2600777
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KEYWORDS
Femtosecond phenomena
Silver
Multiphoton processes
Nonlinear optics
Plasmonics
Second-harmonic generation
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