title: Coherent diffractive imaging beyond the projection approximation: waveguiding at extreme ultraviolet wavelengths.
abstract: We study extreme-ultraviolet wave propagation within optically thick nanostructures by means of high-resolution coherent diffractive imaging using high-harmonic radiation. Exit waves from different objects are reconstructed by phase retrieval algorithms, and are shown to be dominated by waveguiding within the sample. The experiments provide a direct visualization of extreme-ultraviolet guided modes, and demonstrate that multiple scattering is a generic feature in extruded nanoscale geometries. The observations are successfully reproduced in numerical and semi-analytical simulations.
authors.forename: Sergey
authors.initials: S
authors.lastname: Zayko
authors.forename: Eike
authors.initials: E
authors.lastname: Mönnich
authors.forename: Murat
authors.initials: M
authors.lastname: Sivis
authors.forename: Dong-Du
authors.initials: DD
authors.lastname: Mai
authors.forename: Tim
authors.initials: T
authors.lastname: Salditt
authors.forename: Sascha
authors.initials: S
authors.lastname: Schäfer
authors.forename: Claus
authors.initials: C
authors.lastname: Ropers