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Journal Article

High visibility in two-color above-threshold photoemission from tungsten nanotips in a coherent control scheme

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Förster,  Michael
Ultrafast Quantum Optics, Laser Spectroscopy, Max Planck Institute of Quantum Optics, Max Planck Society;
University of Erlangen Nuremberg;

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Krüger,  Michael
Ultrafast Quantum Optics, Laser Spectroscopy, Max Planck Institute of Quantum Optics, Max Planck Society;
University of Erlangen Nuremberg;

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Hommelhoff,  Peter
Ultrafast Quantum Optics, Laser Spectroscopy, Max Planck Institute of Quantum Optics, Max Planck Society;
University of Erlangen Nuremberg;
Hommelhoff Group, Associated Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Paschen, T., Förster, M., Krüger, M., Lemell, C., Wachter, G., Libisch, F., et al. (2017). High visibility in two-color above-threshold photoemission from tungsten nanotips in a coherent control scheme. JOURNAL OF MODERN OPTICS, 64(10-11), 1054-1060. doi:10.1080/09500340.2017.1281453.


Cite as: https://hdl.handle.net/21.11116/0000-0000-8E76-C
Abstract
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 (1560nm) and second harmonic (780nm) 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 simulations.