| 摘要 |
An X-ray waveguide includes a core having a curved portion and a cladding. The core has a periodic structure made of different substances periodically arrayed perpendicular to a guiding direction. A critical angle for total reflection of an X-ray at a core-cladding interface is larger than a Bragg angle of the periodic structure. A critical angle for the total reflection of the X-ray at a substance interface in the periodic structure is smaller than the Bragg angle. When s is a core width in a direction perpendicular to the guiding direction and parallel to a curvature radius of the curved portion, nlow is a refractive-index real part of the substance having a minimum real part of refractive index, nhigh is a refractive-index real part of the substance having a maximum real part of refractive index, and R is the curvature radius, [s/ln(nhigh/nlow)]<R is satisfied.
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