Distinct spatiotemporal imaging of femtosecond surface plasmon polaritons assisted with the opening of the two-color quantum pathway effect

Optics Express
Zhenlong ZhaoJingquan Lin

Abstract

Accurately capturing the spatiotemporal information of surface plasmon polaritons (SPPs) is the basis for expanding SPP applications. Here, we report spatio-temporal evolution imaging of femtosecond SPPs launched from a rectangular trench in silver film with a 400-nm light pulse assisted femtosecond laser interferometric time-resolved (ITR) photoemission electron microscopy. It is found that introducing the 400nm light pulse in the spatially separated near-infrared (NIR) laser pump-probe ITR scheme enables distinct spatiotemporal imaging of the femtosecond SPPs with a weak probe pulse in the ITR scheme, which is free from the risk of sample damage due to the required high monochromatic field for a clear photoelectron image as well as the entangled interference fringe (between the SPPs and probe pulse) in the usual spatially overlapped pump-probe ITR scheme. The demonstrated great improvement of the visibility of the SPPs spatiotemporal image with an additional 400nm light pulse scheme facilitates further analysis of the femtosecond SPPs, and carrier wavelength (785nm), group velocity (0.94C) and phase velocity (0.98C) of SPPs are extracted from the distinct spatio-temporal evolution images of SPPs. Furthermore, the modulation o...Continue Reading

References

Aug 15, 2003·Nature·William L BarnesThomas W Ebbesen
Aug 11, 2005·Physical Review Letters·M CinchettiM Kreiter
Mar 16, 2007·Nature·Martin AeschlimannFelix Steeb
Apr 19, 2007·Optics Letters·Vasily V TemnovThomas W Ebbesen
Jun 21, 2012·Optics Express·Christoph LemkeMichael Bauer
Apr 7, 2015·Nano Letters·Yu GongWayne P Hess
Dec 3, 2016·Physical Review Letters·Michael FörsterPeter Hommelhoff
Aug 31, 2017·The Journal of Physical Chemistry Letters·Maciej DąbrowskiHrvoje Petek
Sep 26, 2017·Nano Letters·Daniel PodbielFrank-J Meyer Zu Heringdorf

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