Abstract
Electron emission induced by surface plasmon polaritons (SPPs) or simply surface plasmons excited by high-intensity femtosecond laser irradiation of an ordered Au surface has been studied by time-of-flight (TOF) analysis of the emitted electrons. Significant differences have been found compared to the same analysis of smooth surfaces. The SPP field enhancement has been significantly increased in hot spots which have the same periodicity as the surface. In addition to the increased field enhancement, periodic narrow peaks have been detected in the TOF spectrum. In the laser intensity range, where the high-energy peak is present, some of (also periodic in time) less frequent narrow peaks are about twice as large as the remaining ones, indicating the detection of two electrons (Cooper pairs) at about the same time, namely within the resolution of the TOF spectrometer.
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References
N. Kroó, P. Rácz, and S. Varró, “Surface-Plasmon—Assisted Electron Pair Formation in Strong Electromagnetic Fieldm,” Europhys. Lett. 105, 67003 (2014).
N. Kroó and S. Varró, “Nonlinear Photoelectron Emission from Metal Surfaces Induced by Short Laser Pulses: The Effects of Field Enhancement by Surface Plasmons,” Appl. Phys. B. 105, 509 (2011).
P. Dombi, S.E. Irvine, P. Rácz, M. Lenner, N. Kroó, G. Farkas, A. Mitrofanov, A. Baltuska, T. Fuji, F. Krausz, and A.Y. Elezzabi, “Observation of Few-Cycle, Strong-Field Phenomena in Surface Plasmon Fields,” Opt. Exp. 23, 24206 (2010).
J. Bergou, S. Varró, and M.V. Fedorov, “e—e Scattering in the Presence of an External Field,” J. Phys. A. 14, 2305 (1981).
N. Kroó, P. Rácz, and S. Varró, “Surface-Plasmon—Assisted Magnetic Anomalies on Room Temperature Gold Films in High-Intensity Laser Fields,” Europhys. Lett. 110(6), 67008 (2015).
N. Kroó and P. Rácz, “Plasmonics—The Interaction of Light with Metal Surface Electrons,” Laser Phys. 26, 084011 (2016).
P. Rácz, Z. Pápa, I. Márton, J. Budai, P. Wrobel, T. Stefaniuk, C. Prietl, J.R. Krenn, and P. Dombi, “Measurement of Nanoplasmonic Field Enhancement with Ultrafast Photoemission,” Nano Lett. 17, 1181 (2017).
J. Kupersztych, P. Monchicourt, and M. Raynaud, “Ponderomotive Acceleration of Photoelectrons in Surface-Plasmon—Assisted Multiphoton Photoelectric Emission,” Phys. Rev. Lett. 86, 5180 (2001).
R. Herrmann, S. Samarin, H. Schwabe, and J. Kirschner, “Two Electron Photoemission in Solids,” Phys. Rev. Lett. 81, 2148 (1998).
J. Berakdar, “Emission of Correlated Electron Pairs Following Single-Photon Absorption by Solids and Surfaces,” Phys. Rev. B. 58, 9808 (1998).
N. Fominykh, J. Berakdar, J. Henk, and P. Bruno, “Spectroscopy of the Electron—Electron Interaction in Solids,” Phys. Rev. Lett. 89, 086402 (2002).
K.A. Kouzakov and J. Berakdar, “Photoinduced Emission of Cooper Pairs from Superconductors,” Phys. Rev. Lett. 91, 257007 (2003).
K.A. Kouzakova and J. Berakdar, “Mechanisms of Superconductivity Studied by Two-Particle Emission,” J. Electron. Spectrosc. Relat. Phenom. 161, 121 (2007).
Acknowledgments
The authors acknowledge fruitful discussions with Dr. István Tuttó.
Funding
The authors acknowledge the National Research, Development and Innovation Office of Hungary (Projects PD 125249 and FK 125270) for financing this research.
P. Rácz was supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences (MTA).
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Rácz, P., Kroó, N. Surface-Plasmon-Assisted Cooper Pair Formation in Ordered Gold Films at Room Temperature. Phys. Wave Phen. 27, 192–196 (2019). https://doi.org/10.3103/S1541308X1903004X
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DOI: https://doi.org/10.3103/S1541308X1903004X