title: Curved laser microjet in near field.
abstract: With the use of the finite-difference time-domain-based simulation and a scanning near-field optical microscope that has a metal cantilever tip, the diffraction of a linearly polarized plane wave of wavelength λ by a glass corner step of height 2λ is shown to generate a low divergence laser jet of a root-parabolic form: over a distance of 4.7λ on the optical axis, the beam path is shifted by 2.1λ. The curved laser jet of the FWHM length depth of focus=9.5λ has the diameter FWHM=1.94λ over the distance 5.5λ, and the intensity maximum is 5 times higher than the incident wave intensity. The discrepancy between the analytical and the experimental results amounts to 11%.
authors.affiliation: Image Processing Systems Institute of the Russian Academy of Sciences, Samara, Russia.
authors.forename: Victor V
authors.initials: VV
authors.lastname: Kotlyar
authors.forename: Sergey S
authors.initials: SS
authors.lastname: Stafeev
authors.forename: Alexey A
authors.initials: AA
authors.lastname: Kovalev