Abstract
Interaction of femtosecond laser pulses with metallic tips have been studied extensively and they have proved to be a very good source of ultrashort electron pulses. We present our study of interaction of Laguerre-Gaussian (LG) laser modes with Tungsten tips. We report a change in the order of the interaction for LG beams and the difference in the order of interaction is attributed to ponderomotive shifts in the energy levels corresponding to the enhanced near field intensity supported by numerical simulations.
Highlights
Laguerre-Gaussian (LG) modes are a solution to the paraaxial Helmholtz equation with a cylindrical symmetry
We have presented our study of interaction of femtosecond LG beams with metallic tips
A comparison of the electron emission rates is presented and we show a change in the electron emission property for LG modes
Summary
Laguerre-Gaussian (LG) modes are a solution to the paraaxial Helmholtz equation with a cylindrical symmetry. Individual photons carry orbital angular momentum in addition to spin angular momentum in LG modes Such beams are obtained from Gaussian modes using computer generated holograms [3, 4] or spiral phase plates [5, 6]. Considerable amount of research has been done on the properties of LG modes and the transfer of OAM to matter at various scales It was shown in the case of photoexcitation and photoionization of atoms by OAM beams, the selections rules can be different than those of plane waves due to transfer of OAM [20]. This enhanced near field leads to emission of photoelectrons from the tip surface.
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