Finite-element simulation for X-ray volume diffractive optics based on the wave optical theory

Beam-induced damage on diffractive hard X-ray optics

The issue of beam-induced damage on diffractive hard X-ray optics is addressed. For this purpose a systematic study on the radiation damage induced by a high-power X-ray beam is carried out in both ambient and inert atmospheres. Diffraction gratings fabricated by three different techniques are considered: electroplated Au gratings both with and without the polymer mold, and Ir-coated Si grating...

Refractive and diffractive X-ray optical elements

The planar microelectronics technology, involving lithography and highly anisotropic plasma etching techniques, allows manufacturing high quality refractive and diffractive lenses, which may be used in hard X-ray microprobe and microscopy applications. These silicon lenses are mechanically robust and can withstand high heat load of the white Xray beam at third generation synchrotron radiation s...

An Algorithm for Finite Element Analysis of Tunnel Supports Based on the Winkler’s Theory

An Algorithm for Finite Element Analysis of Tunnel Supports Based on the Winkler’s Theory

Metamaterials for light rays: ray optics without wave-optical analog in the ray-optics limit

Volumes of sub-wavelength electromagnetic elements can act like homogeneous materials: metamaterials. In analogy, sheets of optical elements such as prisms can act ray-optically like homogeneous sheet materials. In this sense, such sheets can be considered to be metamaterials for light rays (METATOYs). METATOYs realize new and unusual transformations of the directions of transmitted light rays....