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Nearly diffraction-limited X-ray focusing with variable-numerical-aperture focusing optical system based on four
Satoshi Matsuyama1, Hiroki Nakamori1,2, Takumi Goto1
1Department of Precision Science and Technology, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
Scientific Reports
|April 22, 2016
Summary
Researchers developed a novel variable numerical aperture (NA) X-ray focusing system using deformable mirrors. This adaptable system allows for controlled focusing size at synchrotron light sources while maintaining diffraction-limited performance.
Area of Science:
- Optics and Photonics
- Materials Science
- X-ray Science
Background:
- Traditional X-ray focusing optics, such as electrostatic and electromagnetic lenses, typically possess fixed numerical apertures (NAs), limiting their adaptability for diverse applications.
- The fixed NA of conventional X-ray optical systems restricts the range of achievable focusing sizes and consequently limits their utility across various scientific and technological fields.
Purpose of the Study:
- To develop and demonstrate a variable-NA X-ray focusing system capable of adjusting the focused beam size without altering the focal position.
- To overcome the limitations of fixed-parameter X-ray optics and enable more versatile applications in X-ray microscopy and lithography.
Main Methods:
- Designed a variable-NA X-ray focusing system incorporating four deformable mirrors arranged in two sets of Kirkpatrick-Baez (KB) configurations.
- Implemented an advanced mirror deformation procedure utilizing optical and X-ray metrology for both offline calibration and online adjustments.
- Conducted focusing tests at a synchrotron radiation beamline (SPring-8) to evaluate the system's performance.
Main Results:
- Successfully demonstrated control over the numerical aperture (NA) of the X-ray focusing system.
- Achieved a variable focused beam size ranging from 108 nm to 560 nm horizontally and 165 nm to 1434 nm vertically.
- Maintained diffraction-limited focusing conditions throughout the tested range of NA adjustments.
Conclusions:
- The developed variable-NA X-ray focusing system offers unprecedented adaptability for X-ray applications.
- This technology enables precise control over beam size, crucial for advanced X-ray microscopy, nanolithography, and other high-resolution techniques.
- The system's ability to adjust NA while preserving focus position and diffraction-limited performance represents a significant advancement in X-ray optics.
