Observation of Dynamical Diffraction of Trapped X-rays on a Curved Crystal Surface
Abstract
We report the first observation of the dynamical diffraction of surface trapped x-ray waves on a curved silicon mirror. The x-ray wave is confined on the concave surface via total external reflection, forming a true x-ray surface bound state. The evanescent tail of the surface states penetrates into the bulk and interacts with the underlying crystal lattice, giving rise to strong diffraction effects. The surface eigenmodes become the superpositions of a forward and a diffracted waves, analogous to the x-ray eigenmode inside the bulk of a crystal under the Laue diffraction geometry. The discovery may have important applications in developing x-ray optical elements like lenses and wave guides, x-ray surface studies, and x-ray lithography applications in the future. We acknowledge the assistance from Dr. P. F. Lyman and Prof. M. J. Bedzyk at Northwestern University and Argonne National Lab and the support from JSEP (grant no. N00014-89-J-1023).
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1997
- Bibcode:
- 1997APS..MAR.N1811L