Salditt, TimTimSaldittHoffmann, S.S.HoffmannVassholz, M.M.VassholzHaber, J.J.HaberOsterhoff, MarkusMarkusOsterhoffHilhorst, J.J.Hilhorst2022-11-212022-11-212015-11-09https://resolver.sub.uni-goettingen.de/purl?gro-2/117173We study the propagation of hard x rays in single curved x-ray waveguide channels and observe waveguide effects down to surprisingly small radii of curvature R similar or equal to 10 mm and a large contour length s similar or equal to 5 mm, deflecting beams up to 30 degrees. At these high angles, about 2 orders of magnitude above the critical angle of total reflection theta(c), most radiation modes are lost by "leaking" into the cladding, while certain "survivor" modes persist. This may open up a new form of integrated x-ray optics "on a chip," requiring curvatures mostly well below the extreme values studied here, e.g., to split and to delay x-ray pulses.journal_article10.1103/PhysRevLett.115.203902266134400003644139000083141790https://publications.goettingen-research-online.de/handle/2/1101x-ray optics and imaging