Photoexcitation in germanium probed by attosecond transient reflectivity spectroscopy

Giacomo Inzani; Lyudmyla Adamska; Amir Eskandari-asl; Nicola Di Palo; Gian Luca Dolso; Bruno Moio; Luciano Jacopo D'Onofrio; Alessio Lamperti; Alessandro Molle; Rocío Borrego-Varillas; Mauro Nisoli; Stefano Pittalis; Carlo Andrea Rozzi; Adolfo Avella; Matteo Lucchini

doi:10.1117/12.3001370

8 March 2024 Photoexcitation in germanium probed by attosecond transient reflectivity spectroscopy

Giacomo Inzani, Lyudmyla Adamska, Amir Eskandari-asl, Nicola Di Palo, Gian Luca Dolso, Bruno Moio, Luciano Jacopo D'Onofrio, Alessio Lamperti, Alessandro Molle, Rocío Borrego-Varillas, Mauro Nisoli, Stefano Pittalis, Carlo Andrea Rozzi, Adolfo Avella, Matteo Lucchini

Author Affiliations +

Proceedings Volume 12884, Ultrafast Phenomena and Nanophotonics XXVIII; 1288408 (2024) https://doi.org/10.1117/12.3001370
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Light fields can sculpt the optical and electronic properties of solids by injecting charge carriers from the valence to the conduction band. The photoinjection process typically unfolds on time scales shorter than the period of the driving radiation, thus being - for visible and near-infrared light - below one femtosecond. Despite being pervasive, only a few experiments investigated the photoinduced charge excitation produced by an intense, ultrashort laser pulse with attosecond temporal resolution. Here we used attosecond transient reflection spectroscopy in combination with a two-fold, advanced theoretical approach to demonstrate that there is not a single photoexcitation mechanism responsible for charge injection in germanium. Instead, it stems from multi-photon absorption and band dressing, while intra-band motion has a hindering effect.

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Giacomo Inzani, Lyudmyla Adamska, Amir Eskandari-asl, Nicola Di Palo, Gian Luca Dolso, Bruno Moio, Luciano Jacopo D'Onofrio, Alessio Lamperti, Alessandro Molle, Rocío Borrego-Varillas, Mauro Nisoli, Stefano Pittalis, Carlo Andrea Rozzi, Adolfo Avella, and Matteo Lucchini "Photoexcitation in germanium probed by attosecond transient reflectivity spectroscopy", Proc. SPIE 12884, Ultrafast Phenomena and Nanophotonics XXVIII, 1288408 (8 March 2024); https://doi.org/10.1117/12.3001370

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