Two-Dimensional X-ray Waveguides and Point Sources
F. Pfeiffer,1
C. David,2
M. Burghammer,3
C. Riekel,3
T. Salditt1*
We show that resonant coupling of synchrotron beams into
suitable nanostructures can be used for the generation of coherent x-ray point sources. A two-dimensionally confining x-ray waveguide structure has been fabricated by e-beam lithography. By shining a
parallel undulator beam onto the structure, a discrete set of resonant
modes can be excited in the dielectric cavity, depending on the two
orthogonal coupling angles between the beam and the waveguide
interfaces. The resonant excitation of the modes is evidenced from the
characteristic set of coupling angles as well as the observed far-field
pattern. The x-ray nanostructure may be used as coherent x-ray point
sources with a beam cross section in the nanometer range.
1 Universität des Saarlandes, Im
Stadtwald 38, Postfach 15 11 50, 66041 Saarbrücken, Germany.
2 Laboratory for Micro- and Nanotechnology, Paul
Scherrer Institut, CH-5232 Villingen-PSI, Switzerland.
3 European Synchrotron Radiation Facility, Boite
Postale 220, F-38043 Grenoble Cedex, France.
*
To whom correspondence should be addressed. E-mail:
salditt{at}mx.uni-saarland.de
