Holographic exposure of subwavelength circular gratings using a cone based interferogram

Fabrication of circular gratings formed of radially periodic circular lines is presented. It is a very simple fringes projection set-up based on holistic printing method using a axicon to generate the self-interferogramm of a Bessel beam using a transmissive cone. The new holographic optical interference scheme has been designed to produce circular lines based interferogram from a azimuthally polarized beam. The angle of the cone is adapted to cover a restricted periods range. The principle of the method is described and applied to the fabrication of a radial polarizer of sub-micron period.