30 April 1998 Optical phase control of coherent electron dynamics in copper
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hrvoje Petek, Hisahi Nagano, Winfried Nessler, Susumu Ogawa, Albert P. Heberle, "Optical phase control of coherent electron dynamics in copper", Proc. SPIE 3272, Laser Techniques for Surface Science III, (30 April 1998); doi: 10.1117/12.307135; https://doi.org/10.1117/12.307135
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