Fabrication and diffraction efficiency of a 160-nm period x-ray reflection grating produced using thermally activated selective topography equilibration

We have fabricated a blazed X-ray reflection grating with a period of 160 nm using thermally activated selective topography equilibration (TASTE). The grating was tested for diffraction efficiency using the soft X-ray reflectometer at Lawrence Berkeley National Laboratory's Advanced Light Source. Preliminary results show total absolute diffraction efficiency ≥ 40% at lower energies, with maximum single order diffraction efficiency ranging from 20-40%. Total diffraction efficiency was ≥ 30% across the entire measured band pass of 180 eV to 1300 eV.