A phase plate nano-focusing unit and its design method

Abstract

The invention discloses a phase sheet-type nanometer focusing unit and a design method of the phase sheet-type nanometer focusing unit. The phase sheet-type nanometer focusing unit comprises multiple pairs of refraction units of a tooth-shaped structure, wherein the section, in the direction of a light outgoing plane, of the nth pair of the refraction units of the tooth-shaped structure is provided with three vertexes (A[n], A[n+1] and B[n+1]), the refraction units of the tooth-shaped structure are symmetrically distributed along an optical axis, all the straight sides A[n]A[n+1] are arranged on the same incident plane, the section vertexes B[n+1] of the units of the tooth-shape structure are distributed in the mode of meeting the Fresnel waveband law, curved sides A[n]B[n+1] close to the optical axis can carry out the equal optical path difference focusing on incident light, focused light of different pairs of refraction units of the tooth-shaped structure meets the requirement for the equal optical path difference, and distribution of curved sides A[n+1]B[n+1] meets the Bragg diffraction condition of the incident light. According to the phase sheet-type nanometer focusing unit and the design method of the phase sheet-type nanometer focusing unit, the limitation that the numerical aperture of an X-ray waveband focusing lens is smaller than can be overcome through a single phase sheet-type nanometer focusing lens, the function of achieving nanoscale focusing is achieved, and the caliber is large.

Description

technical field [0001] The invention relates to a hard X-ray focusing optical element and a design method thereof, in particular to a phase plate nano-focusing optical element, belonging to the technical fields of synchrotron radiation beamline engineering and synchrotron radiation optics. Background technique [0002] Synchrotron radiation is widely used in materials science, environmental science, biomedicine, chemistry and other fields due to its high brightness, wide spectrum, high collimation, pulse, and good polarization characteristics. Synchrotron radiation facilities are the main source of high-performance hard X-rays. Hard X-rays have strong penetrating power and are widely used in many fields such as X-ray spectroscopy analysis, fluorescence analysis, X-ray diffraction, X-ray absorption and phase imaging. In the above research fields, a hard X-ray focusing spot in the micrometer scale or even the nanometer scale is very necessary. [0003] In order to obtain a h...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the traditional phase plate focusing lens cannot break through Limiting shortcomings, provide a phase plate nano-focusing unit and its design method that can realize nano-scale focusing; the structure of the focusing mirror is composed of many tooth-shaped structures, each tooth-shaped structure consists of a straight side and two curved sides There are three vertices; the arrangement of the vertices satisfies the wave band law, and the surface shape of the upper and lower curved sides is obtained through strict derivation according to the Bragg condition, the conditions required for constructive interference, and Fermat's principle

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