Reflectance measurement of EUV mirrors with s- and p-polarized light using polarization control units

Harada, Tetsuo; Watanabe, Takeo

doi:10.1117/12.2502009

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Over the last decades, FUV polarimetry as a powerful tool has received much attention in many fields, such as FUV ellipsometry [1], synchrotron radiation [2][3][4], free-electron laser [2,5], atomic and molecular physics [6], and solar physics [7,8]. A very important application of FUV polarimetry is to measure the magnetic field vector of the solar corona [9], which helps to understand and forecast the Sun's activities that affect telecommunications, spacecraft, and power transmission.…”

Section: Introductionmentioning

confidence: 99%

Compact and efficient wire grid reflecting polarizersat 121.6 nm

Zhao¹,

Teng²,

Xiao³

et al. 2022

Phys. Scr.

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In this work, two structures of wire grid reflecting polarizers have been proposed and optimized at the target wavelength of 121.6 nm (H Lyman-α), which aims to realize compact and efficient polarizers for measuring the magnetic field vector of the solar corona. Both structures are based on a high reflective patterned Al/MgF2 bi-layer on top of an absorbent substrate, and a layer of MgF2 is sandwiched in the Al gaps to prevent it from being oxidized. Two promising solutions were selected, exhibiting a polarization degree of more than 99.99% and a TE-reflectance over 0.3. Their sensitivity to nanowire parameters has been carried out to evaluate manufacturing feasibility. The angular and spectral performance demonstrated that such polarizers have the large potential to significantly contribute to the future far-ultraviolet (FUV) instruments.

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Section: Introductionmentioning

confidence: 99%

Compact and efficient wire grid reflecting polarizersat 121.6 nm

Zhao¹,

Teng²,

Xiao³

et al. 2022

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…Polarimetry in the far-ultraviolet (FUV) and extreme-ultraviolet (EUV) wavelength range is a technique that has recently grown in importance in many fields of modern science, including FUV/EUV ellipsometry [1], characterization and control of the beam polarization in synchrotrons [2]- [4] and free-electron laser sources [2], [5]- [8], and solar physics [9], [10]. A very interesting application in which the FUV polarimetry finds large employment is the measurement of solar magnetic field vector in the solar corona made via the Hanle effect [11] by using observation from space.…”

Section: Introductionmentioning

confidence: 99%

Nanowire Grid Reflecting Polarizers for Ultraviolet Applications

2020

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Polarimetry in the far ultraviolet (FUV) is a powerful tool in many applications such as UV/EUV ellipsometry, characterization and control of the beam polarization status in large scale facilities and solar physics. FUV polarizers are among the most difficult components to manufacture, mainly due to the lack of dichroic and transparent materials in this spectral range. Although many different solutions for their fabrication have been investigated in the last decades, surprisingly, the use of Wire Grid Polarizers (WGPs) is still poorly investigated in this spectral region. In this work, two different concepts of WGPs have been designed and optimized for the FUV range: one is based on absorptive nano-wires on top of an highly reflective substrate, and the second one is based on highly reflective nano-wires on top of an absorptive substrate. Different wires' shapes have been considered and relative structures optimized at a target wavelength of 121.6 nm. Two very promising solutions have been selected, which exhibit a polarization degree over 99.9% and a TE-reflectance over 0.2. Their sensitivity to the wires' dimension parameters have been investigated to assess their feasibility.

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Design optimization of broadband extreme ultraviolet polarizer in high-dimensional objective space

Kuang

Wang

et al. 2022

Chinese Phys. B

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With the purpose of designing the extreme ultraviolet polarizer with many objectives, a combined application of multiobjective genetic algorithms is theoretically proposed. Owing to the multiobjective genetic algorithm, the relationships between different designing objectives of extreme ultraviolet polarizer have been obtained by analyzing the distribution of nondominated solutions in the 4D objective space, and the optimized multilayer design can be obtained by guiding the searching in the desired region based on the multiobjective genetic algorithm with reference direction. Comparing with the conventional method of multilayer design, our method has a higher probability of achieving the optimal multilayer design. Our work should be the first research in optimizing the optical multilayer designs in the high-dimensional objective space, and our results demonstrate a potential application of our method in the designs of optical thin films.

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Reflectance measurement of EUV mirrors with s- and p-polarized light using polarization control units

Cited by 4 publications

References 13 publications

Compact and efficient wire grid reflecting polarizersat 121.6 nm

Compact and efficient wire grid reflecting polarizersat 121.6 nm

Nanowire Grid Reflecting Polarizers for Ultraviolet Applications

Design optimization of broadband extreme ultraviolet polarizer in high-dimensional objective space

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