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24 May 2022 Nonadiabatic nano-optical tunneling of photoelectrons in plasmonic near-fields
Béla Lovász, Péter Sándor, Gellért-Zsolt Kiss, Balázs Bánhegyi, Péter Rácz, Zsuzsanna Pápa, Judit Budai, Christine Prietl, Joachim R. Krenn, Péter Dombi
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Proceedings Volume 12131, Nanophotonics IX; 121310B (2022) https://doi.org/10.1117/12.2620634
Event: SPIE Photonics Europe, 2022, Strasbourg, France
Abstract
Our work demonstrates nonadiabatic tunneling of photoelectrons in the near-field of gold nanostructures, which occurs in the transition region between the multi-photon-induced photoemission and tunneling emission regimes. Measured kinetic energy spectra at higher laser intensities indicates strong-field electron accelaration and recollision, characteristic for the tunneling emission regime. At the same time, constant scaling of the photoelectron current with the intensity has been measured, a trait of the multi-photon-induced photoemission regime. The Keldysh value of γ ≈ 2 for the transition was determined by analyzing the measured photoemission spectra. This value is in good agreement with the results acquired by the numerical solution of the Time-Dependent Schrödinger Equation.
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Béla Lovász, Péter Sándor, Gellért-Zsolt Kiss, Balázs Bánhegyi, Péter Rácz, Zsuzsanna Pápa, Judit Budai, Christine Prietl, Joachim R. Krenn, and Péter Dombi "Nonadiabatic nano-optical tunneling of photoelectrons in plasmonic near-fields", Proc. SPIE 12131, Nanophotonics IX, 121310B (24 May 2022); https://doi.org/10.1117/12.2620634
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KEYWORDS
Lab on a chip
Ionization
Free electron lasers
Gold
Solids
Silica
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