Submicrometer fluorescence microprobe based on Bragg-Fresnel optics

Abstract

An x-ray fluorescence microprobe with linear Bragg-Fresnel lens was tested at the European Synchrotron Radiation Facility Microfocus beamline. A focal line with a width of 0.8 μm was observed using the knife-edge technique at a wavelength of 0.85 Å (14.6 eV). Wiener filtering with the Fast Fourier Transformation was applied to solve a convolution equation to evaluate the size of the probe from fluorescence data.