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Ultrafast electron emission from metallic nanotip arrays induced by near infrared femtosecond laser pulses
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View: Figures


Image of FIG. 1.
FIG. 1.

Scanning electron microscope images of the Mo field-emitters aligned with a period. The gate electrode is a thick Mo film separated from the emitter substrate by a thick film. Individual emitters are tall. The inset is the apex of an emitter imaged from the top at higher magnification, showing that the apex diameter is equal to .

Image of FIG. 2.
FIG. 2.

(a) dc field-emission current (filled squares) and the photoelectric signals vs gate bias voltages when the FEA is irradiated at (filled circles), and at (empty circles). (b) The FN plot of (squares) and of the photoelectric signals at these two laser intensities. The linear slope of the relation between and suggests that the emitter apex field is given by with equal to .

Image of FIG. 3.
FIG. 3.

(a) Photoelectric current pulse from the Mo FEA device observed when the gate bias voltages was varied from , when the device was irradiated by the -polarized laser pulses at a peak intensity of (from top to down, was varied by step between 0 and and by between 75 and ; the photocurrent was measured using an amplifier with frequency bandwidth). (b) Photoelectric current signal vs laser intensity with set to (filled triangle), (circles), and (squares). For the latter, the filled signs represent the fast and the empty symbols the slow signal component. The broken curve shows the dependence of the zero bias signal at low excitation intensity, evidencing the three photon photoemission process which becomes saturated at high excitation. The chain lines are the linear fit of the fast signals for equal to (double chain) and (single chain) indicating that these are generated by single-photon photoemission.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultrafast electron emission from metallic nanotip arrays induced by near infrared femtosecond laser pulses