Research Papers in Physics and Astronomy

 

Date of this Version

2017

Citation

New J. Phys. 19 (2017) 023011

Comments

©2017 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft

Open access

https://doi.org/10.1088/1367-2630/aa58bb

Abstract

Two-color multiphoton emission from polycrystalline tungsten nanotips has been demonstrated using two-color laser fields. The two-color photoemission is assisted by a three-photon multicolor quantum channel, which leads to a twofold increase in quantum efficiency. Weak-field control of twocolor multiphoton emission was achieved by changing the efficiency of the quantum channel with pulse delay. The result of this study complements two-color tunneling photoemission in strong fields, and has potential applications for nanowire-based photonic devices. Moreover, the demonstrated two-color multiphoton emission may be important for realizing ultrafast spin-polarized electron sources via optically injected spin current.

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