High-efficiency zone-plate optics for multi-keV X-ray focusing.
High-efficiency nanofocusing of hard X-rays using stacked multilevel Fresnel zone plates with a smallest zone width of 200 nm is demonstrated. The approach is to approximate the ideal parabolic lens profile with two-, three-, four- and six-level zone plates. By stacking binary and three-level zone plates with an additional binary zone plate, the number of levels in the optical transmission function was doubled, resulting in four- and six-level profiles, respectively. Efficiencies up to 53.7% focusing were experimentally obtained with 6.5 keV photons using a compact alignment apparatus based on piezoelectric actuators. The measurements have also been compared with numerical simulations to study the misalignment of the two zone plates.
Paul Scherrer Institut, 5232 Villigen, Switzerland.
Istvan
I
Mohacsi
Paul Scherrer Institut, 5232 Villigen, Switzerland.
Petri
P
Karvinen
Paul Scherrer Institut, 5232 Villigen, Switzerland.
Ismo
I
Vartiainen
Paul Scherrer Institut, 5232 Villigen, Switzerland.
Vitaliy A
VA
Guzenko
Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, 91192 Gif-sur-Yvette, France.
Andrea
A
Somogyi
Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, 91192 Gif-sur-Yvette, France.
Cameron M
CM
Kewish
Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, 91192 Gif-sur-Yvette, France.
Pascal
P
Mercere
Paul Scherrer Institut, 5232 Villigen, Switzerland.
Christian
C
David
Fresnel zone plates; X-ray nanofocusing; zone-plate stacking