title: Kinoform diffractive lenses for efficient nano-focusing of hard X-rays.
abstract: A nano-focusing module based on two linear Fresnel zone plates is presented. The zone plates are designed to generate a kinoform phase profile in tilted geometry, thus overcoming the efficiency limitations of binary diffractive structures. Adjustment of the tilt angle enables tuning of the setup for optimal efficiency over a wide range of photon energies, ranging from 5 to 20 keV. Diffraction efficiency of more than 50% was measured for the full module at 8 keV photon energy. A diffraction limited spot size of 100 nm was verified by ptychographic reconstruction for a lens module with a large entrance aperture of 440 μm × 400 μm.
authors.forename: Petri
authors.initials: P
authors.lastname: Karvinen
authors.forename: Daniel
authors.initials: D
authors.lastname: Grolimund
authors.forename: Markus
authors.initials: M
authors.lastname: Willimann
authors.forename: Beat
authors.initials: B
authors.lastname: Meyer
authors.forename: Mario
authors.initials: M
authors.lastname: Birri
authors.forename: Camelia
authors.initials: C
authors.lastname: Borca
authors.forename: Jens
authors.initials: J
authors.lastname: Patommel
authors.forename: Gerd
authors.initials: G
authors.lastname: Wellenreuther
authors.forename: Gerald
authors.initials: G
authors.lastname: Falkenberg
authors.forename: Manuel
authors.initials: M
authors.lastname: Guizar-Sicairos
authors.forename: Andreas
authors.initials: A
authors.lastname: Menzel
authors.forename: Christian
authors.initials: C
authors.lastname: David