Two-color multiphoton emission from nanotips
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 two-color 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.
- Publication:
-
New Journal of Physics
- Pub Date:
- February 2017
- DOI:
- 10.1088/1367-2630/aa58bb
- arXiv:
- arXiv:1701.01406
- Bibcode:
- 2017NJPh...19b3011C
- Keywords:
-
- Quantum Physics;
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Physics - Optics
- E-Print:
- New J. Phys. 19, 023011 (2017)