Abstract
Ultrafast electron emission is important to free electron lasers (FELs), laser acceleration of relativistic electrons and electron sources. It is also important to the development of novel vacuum nanoelectronics [1]–[3]. Two-color laser pulses have been used to produce ultrafast electron emission from a metal nanotip, showing great control of the dynamics and distribution of electrons [4]. We present an analytical model for ultrafast electron emission from a metal-vacuum interface due to two-color laser fields, by solving the time-dependent Schrodinger equation [5]. Our exact solutions are valid for arbitrary fundamental and harmonic laser frequencies, laser intensities, phase difference between the two-color lasers, metal work function and Fermi level. The results are in a good agreement with the experiments [4]. Different electron emission mechanisms such as multiphoton absorption or emission, optical field emission and single-photon induced over-barrier emission are revealed in a single formulation.
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