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Proceedings Paper

Optical phase control of coherent electron dynamics in copper
Author(s): Hrvoje Petek; Hisahi Nagano; Winfried Nessler; Susumu Ogawa; Albert P. Heberle
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Paper Abstract

Photoinduced electron-hole excitation and relaxation in bulk, at interfaces, and at surfaces of solid state materials play a key role in a variety of physical and chemical phenomena that are important for surface photochemistry, and device physics. The possibility of controlling the charge carrier dynamics by the means of the optical phase may open up new possibilities in these fields. The control of electron distribution excited in Cu(111) through optical phase of the excitation light is demonstrated. Two-photon photoemission from the Cu(111) surface is excited by a pair of approximately 15 fs laser pulses with a mutual delay fixed to an accuracy of +/- 0.025 fs. A consequence of the interference between several coherent excitation pathways in the two-photon excitation process, the photoemission spectra do not only depend on the frequency, as in conventional spectroscopy, but also on the phase of the excitation light. Though coherent control is demonstrated for electrons at a metal surface, the excitation scheme is identical to optical Ramsey fringe experiments, and therefore, is a general phenomenon in multi-photon ionization in atomic, molecular, and condense phase environments.

Paper Details

Date Published: 30 April 1998
PDF: 7 pages
Proc. SPIE 3272, Laser Techniques for Surface Science III, (30 April 1998); doi: 10.1117/12.307135
Show Author Affiliations
Hrvoje Petek, Hitachi Ltd. (Japan)
Hisahi Nagano, Hitachi Ltd. (Japan)
Winfried Nessler, Hitachi Ltd. (Japan)
Susumu Ogawa, Hitachi Ltd. (Japan)
Albert P. Heberle, Hitachi Cambridge Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 3272:
Laser Techniques for Surface Science III
Hai-Lung Dai; Hans-Joachim Freund, Editor(s)

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