NSLS-II Seminar

"Multilayer Laue Lens - A Path Towards Nanofocusing of X-rays"

Presented by Hanfei Yan

Monday, June 11, 2007, 12:00 pm — NSLS-II Seminar Room, Bldg. 817

Recent progress in mirrors, refractive lenses, and zone plate has pushed the frontier for x-ray focusing into the range of 15-30 nm, which may be near the limit for these approaches. A new type of volume diffractive optics, called Multilayer Laue Lens (MLL), has been proposed and developed at Argonne National Laboratory to achieve one nanometer focusing with high efficiency1. In this talk I’ll describe a new dynamical diffraction theory for volume diffractive optics, which enables us to study the diffraction and imaging properties of MLL’s with arbitrary zone profile and large numerical aperture. The performance of non-optimized and optimized geometries for ultimate focusing, namely flat, wedged, and ideally curved MLL structures, will be discussed. The theoretical study shows that in principle ideally curved MLL structures are capable of achieving a resolution limit close to the wavelength, an atomic-scale focusing. I will also show the extension of present theory to other types of diffractive optics, for example, kinoform lens. Lastly I’ll update the MLL experiments conducted at sector 26 at the Advanced Photon Source, Argonne National Laboratory, which have yielded to date a line focus with a width of ~17 nm at x-ray energies of 19.5 keV and 29.25 keV.

Hosted by: John Hill

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