title: Inclined-incidence hard-X-ray resonator with ultrahigh efficiency and resolution.
abstract: We report a high-efficiency hard-X-ray resonator with inclined-incidence geometry. A beam incident at 36.87° with respect to [3 1 0] excites Bragg back diffraction along (12 4 0) at 14.4388 keV for resonance in a Si-based resonator to produce intense resonance fringes. The experimental results showed the visibility enhanced by nearly 30 times compared with normal incidence. Also numerical calculations of the inclined-incidence resonator demonstrate ultrahigh efficiency and extremely narrow resolving power (sub-meV) with low background. This geometry surpasses the intrinsic limits of normal-incidence crystal-based resonators and enables ultrahigh-resolution X-ray optics for X-ray diffraction, spectroscopy, and imaging applications.
authors.forename: Y-H
authors.initials: YH
authors.lastname: Wu
authors.forename: Y-W
authors.initials: YW
authors.lastname: Tsai
authors.forename: C-H
authors.initials: CH
authors.lastname: Chu
authors.forename: W-C
authors.initials: WC
authors.lastname: Liu
authors.forename: Y-Y
authors.initials: YY
authors.lastname: Chang
authors.forename: S-L
authors.initials: SL
authors.lastname: Chang