Journal Article LiF detectors Research Support, Non-U.S. Gov't X-ray beam characterization X-ray focusing X-ray free-electron lasers asymmetrical metal-dielectric nanoparticles color centers compound refractive lenses diffraction patterns excitons femtosecond laser melting focusing system lithium fluoride (LiF) detector magnetic optical response metal-organic frameworks molecular dynamics simulation optical nonlinearity tuning of scattering properties van der Waals structures