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Ponderomotive electron acceleration using surface plasmon waves excited with femtosecond laser pulses
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental arrangement. Two laser pulses, one of which has a variable delay, are combined using a beam splitter (BS) and are incident collinearly on the metal film (Ag or Au) that has been deposited on the prism surface. Electrons emitted from the surface are analyzed using the retarding potential method. To measure the angular distribution of the electrons, the grid is removed and the detector is swept in an arc about the prism surface.

Image of FIG. 2.
FIG. 2.

Calculated (solid lines) and experimentally measured (circles) integral kinetic energy distributions for (a) Ag and (b) Au metal films. The calculated (solid lines) and experimentally measured (circles) in-plane angular distributions are shown in the corresponding insets.

Image of FIG. 3.
FIG. 3.

Interferometric autocorrelation traces. The measured traces are illustrated for (a) Ag and (b) Au, along with the calculated traces corresponding to and .

Image of FIG. 4.
FIG. 4.

Dependence of photocurrent on pump intensity for (a) Ag and (b) Au. For lower intensities, third- and fourth-order power dependencies are observed. However, at higher intensities, the orders are reduced in both metals to 1.47 and 1.26 for Ag and Au, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ponderomotive electron acceleration using surface plasmon waves excited with femtosecond laser pulses