Near-field imaging and revealing dynamics of ultrafast surface plasmons using photoemission electron microscopy

Yulu Qin; Boyu Ji; Xiaowei Song; Yang Xu; Jingquan Lin

doi:10.1117/12.2537273

18 November 2019 Near-field imaging and revealing dynamics of ultrafast surface plasmons using photoemission electron microscopy

Yulu Qin, Boyu Ji, Xiaowei Song, Yang Xu, Jingquan Lin

Author Affiliations +

Proceedings Volume 11194, Plasmonics IV; 111940M (2019) https://doi.org/10.1117/12.2537273
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

The precise understanding of the spatiotemporal characteristics of ultrafast surface plasmons is a prerequisite for applications of plasmonics. Here, we report on the investigation of near-field imaging and dynamics of propagating and localized surface plasmons (PSPs and LSPs) using photoemission electron microscopy (PEEM) of the trench on the silver film and gold bowtie nanostructure. The actual propagation direction of PSPs is directly obtained by reading PEEM images via the non-collinear exciting method by the trench. The results have demonstrated that the trench structure is potential as a 2D plasmonic dispersion element. Moreover, we experimentally obtain diﬀerent LSPs dephasing times in the tips of the bowtie nanostructure by interferometric time-resolved PEEM. Experimental result reveals the dynamics of the LSP field initially oscillate at the laser field frequency and finally develop into its eigenfrequency after experiencing a few periods of frequency ﬂuctuation.

Citation Download Citation

Yulu Qin, Boyu Ji, Xiaowei Song, Yang Xu, and Jingquan Lin "Near-field imaging and revealing dynamics of ultrafast surface plasmons using photoemission electron microscopy", Proc. SPIE 11194, Plasmonics IV, 111940M (18 November 2019); https://doi.org/10.1117/12.2537273

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