High Visibility in Two-Color Above-Threshold Photoemission from Tungsten Nanotips in a Coherent Control Scheme
| Autor: | Paschen, Timo, Förster, Michael, Krüger, Michael, Lemell, Christoph, Wachter, Georg, Libisch, Florian, Madlener, Thomas, Burgdörfer, Joachim, Hommelhoff, Peter |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | J. Mod. Opt. 64, 10-11, 1054-1060 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1080/09500340.2017.1281453 |
| Popis: | In this article we present coherent control of above-threshold photoemission from a tungsten nanotip achieving nearly perfect modulation. Depending on the pulse delay between fundamental (1560 nm) and second harmonic (780 nm) pulses of a femtosecond fiber laser at the nanotip, electron emission is significantly enhanced or depressed during temporal overlap. Electron emission is studied as a function of pulse delay, optical near-field intensities, DC bias field, and final photoelectron energy. Under optimized conditions modulation amplitudes of the electron emission of 97.5% are achieved. Experimental observations are discussed in the framework of quantum- pathway interference supported by local density of states (LDOS) simulations. Comment: 9 pages, 6 figures |
| Databáze: | arXiv |
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