Abstract
We show that a field emission tip electron source that is triggered with a femtosecond laser pulse can generate electron pulses shorter than the laser pulse duration (100 fs). The emission process is sensitive to a power law of the laser intensity, which supports an emission mechanism based on multiphoton absorption followed by over-the-barrier emission. Observed continuous transitions between power laws of different orders are indicative of field emission processes. We show that the source can also be operated so that thermionic emission processes become significant. Understanding these different emission processes is relevant for the production of sub-cycle electron pulses.
Highlights
Collision dynamics in the tip [21], or dynamic polarizability in the tip [22]–[26], and cannot be expected to describe the detailed dynamics of the emission process
We study the emission of electrons from a nanometer tip due to femtosecond laser pulses
The pulse duration can be determined by the absence or presence of the additive nature of the electron emission process
Summary
Collision dynamics in the tip [21], or dynamic polarizability in the tip [22]–[26], and cannot be expected to describe the detailed dynamics of the emission process. Assuming that the emission process from the nanometer tip is due to optical field emission, the electron bunches were claimed to be sub-cycle [9]. We study the emission of electrons from a nanometer tip due to femtosecond laser pulses.
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