УДК: 535.21, 538.971

Ionization of nanoparticles by supershort moderate-intensity laser pulses

Gruzdev, V.E., Komolov, V.L., Przhibelskiy, S.G.

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Груздев В.Е., Комолов В.Л., Пржибельский С.Г. Ионизация наночастиц сверхкороткими лазерными импульсами умеренной интенсивности // Оптический журнал. 2014. Т. 81. № 5. С. 35–42.

Gruzdev V.E., Komolov V.L., Przhibelskiy S.G. Ionization of nanoparticles by supershort moderate-intensity laser pulses [in Russian] // Opticheskii Zhurnal. 2014. V. 81. № 5. P. 35–42.

For citation (Journal of Optical Technology):

V. E. Gruzdev, V. L. Komolov, and S. G. Przhibel’skiĭ, "Ionization of nanoparticles by supershort moderate-intensity laser pulses," Journal of Optical Technology. 81(5), 256-261 (2014). https://doi.org/10.1364/JOT.81.000256

Abstract:

This paper presents the results of the numerical modelling of electron emission from metallic nanoparticles under the action of femtosecond laser pulses with peak intensity from tenths of a terawatt to tens of terawatts per square centimeter. The model takes into account the effects of the excitation of the valence electrons of the nanoparticle due to multiphoton absorption, described by the Keldysh model, and the increase of the ionization potential due to the generation of positive charge in the nanoparticle during electron emission. The transition from multiphoton ionization to tunnel emission as the laser-radiation intensity increases is demonstrated, and it is shown that Fowler’s model and its modification give a substantial underestimate of both the peak photoemission rate and the total emission current.

Keywords:

nanoparticles, photoemission, femtosecond interactions, multiphoton photoelectric effect

Acknowledgements:

This work was carried out with the state financial support of the leading universities of the Russian Federation (Subsidy 074-U01).

OCIS codes: 320.2250

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