title: Direct measurement of an electric field in femtosecond Bessel-Gaussian beams.
abstract: We demonstrated the mapping of the spatial oscillation of electric fields in the transverse plane of a femtosecond Bessel-Gaussian laser beam from the first principle of classical electrodynamics. An attosecond burst of electrons for probing the electric force was placed in the Bessel beam through photoemission with single isolated 276 as extreme ultraviolet pulses. The direction reversal of the electric field in adjacent Bessel rings was directly confirmed by observing the momentum shift of the probe electrons.
authors.affiliation: J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA.
authors.forename: Steve
authors.initials: S
authors.lastname: Gilbertson
authors.forename: Ximao
authors.initials: X
authors.lastname: Feng
authors.forename: Sabih
authors.initials: S
authors.lastname: Khan
authors.forename: Michael
authors.initials: M
authors.lastname: Chini
authors.forename: He
authors.initials: H
authors.lastname: Wang
authors.forename: Hiroki
authors.initials: H
authors.lastname: Mashiko
authors.forename: Zenghu
authors.initials: Z
authors.lastname: Chang