Piezoelectric Mirror for X-ray Nanobeam Focusing
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Solution Overview
Problem
Existing reflective surface shape controllable mirrors face challenges in achieving sub-10nm hard X-ray nanobeam focusing due to surface shape distortions caused by temperature differences and environmental conditions, limiting the accuracy of shape measurement and machining, and requiring precise correction of reflection phase errors in multilayer coatings.
Innovation Solution
A reflective surface shape controllable mirror device with a laminated structure using piezoelectric elements arranged along the sides of a substrate, allowing for voltage application to correct shape errors and adjust the focal length, incorporating a multichannel control system for precise voltage application to restore initial shape and correct phase errors in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mirror with large curvature and high shape accuracy is manufactured to achieve smaller focused beam diameter and high energy, then focusing performance is improved, but the mirror shape is strained due to temperature and environmental conditions, affecting focusing performance
Solution Approach 1:
The patent applies piezoelectric elements to the mirror substrate to enable dynamic adjustment of the mirror surface shape. This allows the mirror to adapt its shape in real-time to compensate for thermal and environmental distortions, transforming a static optical system into a dynamic one that can maintain optimal focusing performance under varying conditions.
Solution Approach 2:
The patent changes physical parameters by applying voltages to piezoelectric elements, which alter the mirror surface curvature and shape. This enables precise control of the wavefront and focal properties, allowing optimization of focusing performance while compensating for temperature-induced shape changes.
2Manufacturing precision
If nanomachining is performed to achieve nano-order accuracy in the reflective surface shape, then manufacturing precision is improved, but wavelength differences between reference light and X-ray cause phase errors
Solution Approach 1:
The patent replaces optical measurement methods with piezoelectric actuation for shape control. Instead of relying on optical interferometry that suffers from wavelength-dependent phase errors, the system uses piezoelectric elements to directly control the mirror shape, enabling accurate X-ray wavefront control independent of optical measurement limitations.
Solution Approach 2:
The patent changes the control parameter from optical phase measurement to piezoelectric voltage application. By controlling the mirror shape through voltage-driven piezoelectric elements rather than iterative optical measurement and correction, the system eliminates wavelength-mismatch phase errors while maintaining nano-order surface accuracy.
3Reliability
If the mirror structure is made rigid to maintain shape stability, then reliability is improved, but adaptability to correct shape errors and adjust focal length is reduced
Solution Approach 1:
The patent creates a composite structure combining a rigid mirror substrate with piezoelectric elements. This composite design maintains the structural stability and shape rigidity of the substrate while incorporating the adaptive shape-control capabilities of piezoelectric materials, achieving both reliability and adaptability simultaneously.
Solution Approach 2:
The patent introduces dynamic control capabilities to an otherwise static rigid mirror structure. The piezoelectric elements enable the rigid substrate to actively adjust its surface shape in response to control signals, providing wavefront correction and focal length adjustment while maintaining overall structural stability.
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
The device achieves nm-order shape accuracy by eliminating distortions caused by temperature differences and environmental conditions, allowing for adjustable wavefront correction and focal length changes, enabling sub-10nm hard X-ray nanobeam focusing with improved spatial resolution and flexibility in optical systems.
Implementation Method 1
a plurality of piezoelectric elements are attached to at least the front surface of the substrate so as to be arranged in the longitudinal direction of the X-ray reflective surface
Data Source
Figure 1~2
Figure 3(a)~3(b)
Figure 4(a)~5(b)
AI summary
The device is configured from: a reflective surface shape controllable mirror in which a band-shaped X-ray reflective surface 2 is formed on a central portion of a front surface of a substrate 1, reference planes 3 are formed along both sides of the X-ray reflective surface, and a plurality of piezoelectric elements 4 are attached to at least one of front and back surfaces of the substrate so as to be arranged in the longitudinal direction of the X-ray reflective surface on both side portions of the substrate, and a multichannel control system for applying a voltage to each of the piezoelectric elements.