3D X-Ray Diffractive Optics via Two-Photon Polymerization
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Solution Overview
Problem
Existing methods for manufacturing X-ray and XUV optics, particularly kinoforms, face challenges in achieving high-performance, three-dimensional geometries with micro- or nano-scale features and high aspect ratios, requiring complex multi-step fabrication processes and resulting in non-ideal structures.
Innovation Solution
A method involving two-photon absorption polymerization using a high-intensity energy beam, such as a laser, to create voxels of a diffractive optic by adjusting the beam's focus along predefined trajectories, allowing for rapid production of high-performance kinoforms with unprecedented aspect ratios and integration of various optics on a chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional multi-step fabrication processes are used to manufacture kinoforms, then the manufacturing process is complex and time-consuming, but the aspect ratio and resolution are limited
Solution Approach 1:
The patent changes the fundamental manufacturing parameter from conventional lithography to two-photon polymerization, enabling direct 3D fabrication of kinoforms with high aspect ratios and sub-micron resolution in a single step, eliminating the need for complex multi-step processes
Solution Approach 2:
The patent replaces mechanical multi-step fabrication processes with a laser-based two-photon polymerization system, using optical fields to directly write the 3D kinoform structure into photoresist material, achieving superior precision without mechanical complexity
2Manufacturing precision
If conventional lithography is used to fabricate X-ray optics, then the process is simpler, but the resolution and feature size are limited by diffraction
Solution Approach 1:
The patent changes the physical parameter of light-matter interaction from linear absorption to two-photon absorption, enabling sub-diffraction limit feature sizes by confining polymerization to the focal volume where photon density is sufficient for simultaneous two-photon events
Solution Approach 2:
The patent transitions from 2D planar lithography to 3D volumetric fabrication by utilizing the temporal dimension of pulsed laser excitation and spatial confinement of two-photon absorption, creating three-dimensional kinoform structures with precise control over all spatial dimensions
3Manufacturing precision
If high-intensity laser beams are used for two-photon polymerization, then sub-micron features can be achieved, but the production speed may be reduced
Solution Approach 1:
The patent maintains continuous production speed by using high-repetition-rate pulsed laser systems that continuously write voxels along the kinoform trajectory without interruption, ensuring that the useful action of polymerization proceeds without idle time between pulses
Solution Approach 2:
The patent employs periodic pulsed laser excitation at optimized repetition rates, where each pulse creates a voxel and the periodic timing allows the laser to traverse the entire kinoform structure efficiently, balancing precision requirements with overall fabrication speed
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the rapid fabrication of high-quality X-ray and XUV optics with isometric resolution, achieving virtually unlimited aspect ratios and efficient focusing capabilities, overcoming limitations of traditional fabrication methods by providing a single-step, ultra-fast process.
Implementation Method 1
providing a material with a first component being photo-sensitive and being polymerizable by two-photon-absorption
Implementation Method 2
providing a high-intensity energy beam, in particular a laser beam, wherein the beam comprises a focus having a position being adjustable to a plurality of positions
Data Source
AI summary
The present invention is directed to a method for printing a micro-scaled or nano-scaled XUV and/or X-ray Diffractive optic (1), including the following steps: a) providing a material (2) with a first component (2a) being photo-sensitive and being polymerizable by two-photon-absorption, b) providing data (3) of a desired geometrical structure (4) of the optic (1) and creating at least one trajectory (8) corresponding to the data (3) of the desired structure (4) of the optic (1), c) providing a high-intensity energy beam (5), in particular a laser beam, wherein the beam (5) comprises a focus (F) having a position being adjustable to a plurality of positions (F1, F2, <, Fp) being coincident with the at least one trajectory (8), d) polymerization of the material (2) by two-photon-absorption at a first position (Fn) of the focus (F), thereby creating a first voxel (vn1n2n3) of the structure (4) of the optic (1), adjusting the position of the focus (F) from the first position (Fn) to a subsequent position (Fn+1) of the focus (F) along the at least one trajectory (8) and repeating step d) at the subsequent position (Fn+1) of the focus (F), wherein a distance (d) between each of the positions (F1, F2, <, Fp) of the focus (F) and at least one of the rest of the positions (F1, F2, <, Fp) of the focus (F) is smaller than a mean diameter (vd) of the voxels produced at these positions with respect to their dimension parallel to the distance (d).