Journal
NEW JOURNAL OF PHYSICS
Volume 19, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/aa58bb
Keywords
multicolor quantum channel; two-color multiphoton photoemission; polycrystalline tungsten nanotip; nanowire-based photonics; ultrafast spin-polarized electrons
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Funding
- Nebraska Research Initiative
- National Science Foundation (NSF) [EPS-1430519, PHY-1306565]
- Office of Integrative Activities
- Office Of The Director [1430493] Funding Source: National Science Foundation
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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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