Broadband multilayer optics for ultrafast EUV absorption spectroscopy with free electron laser radiation

Corso, Alain Jody; Zuppella, Paola; Principi, Emiliano; Giangrisostomi, Erika; Bencivenga, Filippo; Gessini, Alessandro; Zuccon, Sara; Masciovecchio, C.; Giglia, Angelo; Nannarone, Stefano; Pelizzo, M. G.

doi:10.1088/2040-8978/17/2/025505

Cited by 10 publications

(9 citation statements)

References 39 publications

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“…The effects of the interfaces roughness and inter-diffusion were modelled using a Gaussian error function according to the Névot and Croce formalism [18]. The Y/Mo interfaces were modelled with an error function with σ = 0.57 nm [19]. For Mo/Be, two different error functions were used: one with a σ = 0.36 nm for Be on Mo interfaces and σ = 0.7 nm for Mo on Be interfaces [20,21].…”

Section: Sxr Materials Selectionmentioning

confidence: 99%

Future perspectives in solar hot plasma observations in the soft X-rays

Corso,

Del Zanna,

Polito

2021

Preprint

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The soft X-rays (SXRs: 90-150 Å) are among the most interesting spectral ranges to be investigated in the next generation of solar missions due to their unique capability of diagnosing phenomena involving hot plasma with temperatures up to 15 MK. Multilayer (ML) coatings are crucial for developing SXR instrumentation, as so far they represent the only viable option for the development of high-efficiency mirrors in the this spectral range. However, the current standard MLs are characterized by a very narrow spectral band which is incompatible with the science requirements expected for a SXR spectrometer. Nevertheless, recent advancement in the ML technology has made the development of non-periodic stacks repeatable and reliable, enabling the manufacturing of SXR mirrors with a valuable efficiency over a large range of wavelengths.In this work, after reviewing the state-of-the-art ML coatings for the SXR range, we investigate the possibility of using M-fold and aperiodic stacks for the development of multiband SXR spectrometers. After selecting a possible choice of key spectral lines, some trade-off studies for an eight-bands spectrometer are also presented and discussed, giving an evaluation of their feasibility and potential performance.

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Section: Sxr Materials Selectionmentioning

confidence: 99%

Future perspectives in solar hot plasma observations in the soft X-rays

Corso,

Del Zanna,

Polito

2021

Preprint

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“…Since the reflectance profile of each block is spectrally shifted with respect to the others, the staking process gives a resulting reflectance curve with an enlarged bandwidth. 36 A more refined approach, which has been largely used in the development of mirrors for photolithography and atto-second pulses manipulation, employs aperiodic structures ( Fig. 1(c)).…”

Section: Euv Multilayer Theorymentioning

confidence: 99%

“…116 In the B 4 C/Pd ML, an error function with = 0.65 nm was considered at each interface 57 whereas for the Y/Mo ML an error function with = 0.57 nm was considered at each interface. 36 At these wavelengths, also B-based MLs can offer very high EUV performance. B has its K-edge at about 6.6 nm, thus acting as good spacer in the ∼ 9-12 nm spectral range.…”

Section: Structures For Wavelength Shorter Thanmentioning

confidence: 99%

“…In general, the scientific goals expected by the future missions are leading the development of instrumentation with increasingly advanced features, resulting in the need of improving ML performance in terms of reflectance, spectral selectivity, stability to heat, radiation and energetic particles. Narrowband MLs with high reflectance peak are pivotal to perform observations with high spectral selectivity, avoiding wavelength inter-mixing and reducing the integration times; likewise, efficient broad-band MLs, which are particularly challenging at wavelengths shorter than that of the Si L 2 3 -edge, 36 are highly required in spectroscopic instruments. Furthermore, coatings able to withstand harsh environments, including high thermal irradiation, protons, electrons, heavier ions and gamma irradiations are in demand.…”

Section: Introductionmentioning

confidence: 99%

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Extreme Ultraviolet Multilayer Nanostructures and Their Application to Solar Plasma Observations: A Review

Corso

Pelizzo

2019

j nanosci nanotechnol

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The advent of nanoscale multilayer (ML) technology has led to great breakthroughs in many scientific and technological fields such as nano-manufacturing, bio-imaging, atto-physics, matter physics and solar physics. ML nanostructures are an enabling technology for the development of mirrors and reflective gratings having high efficiency at normal incidence in the extreme ultraviolet (EUV) range, a spectral region where conventional coatings show a negligible reflectance. In solar physics, ML mirrors have proved to be key elements for both imaging and spectroscopy space instruments, as they allow to make observations of EUV solar plasma emissions with spatial and spectral resolutions never reached before. ML-based instruments have been used in many of the major solar satellites and have flown in numerous sounding rocket experiments; moreover, in the last two decades many studies were performed in order to develop ML structures with increasingly better performance for future solar missions. In this paper, a review of the most promising ML nanostructures developed so far and applied to the observation of solar plasma emission lines is presented. After a brief recall of ML theory, a detailed discussion of the most promising material pairs and layer stack structures proposed and applied to past and current space missions will be presented; in particular, the review will focus on the ML structures having high efficiency in the 6 nm-35 nm wavelength range. Finally, the ML stability to low energy ion bombardment will be discussed.

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“…In this work, we explored the possibility of designing broadband EUV QWPs of the transmission type using aperiodic multilayer structures, which have been widely applied in the design of broadband EUV optical elements, such as reflective mirrors [25,26], polarizers [27,28], phase retarders [29,30], analyzers [31], and the attosecond compressor [32][33][34]. We chose transmission over reflective EUV QWPs in the design because a large phase shift is hard to realize using a multilayer structure under reflective conditions [21].…”

Section: Introductionmentioning

confidence: 99%

Design of broadband transmission quarter-wave plates for polarization control of isolated attosecond pulses

Chen

Lin

Gao

2015

J. Opt.

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Using a standard Levenberg-Marquardt algorithm, broadband quarter-wave plates (QWPs) with bandwidth from 3 to 18 eV in the extreme ultraviolet (EUV) region were designed using aperiodic Mo/Si multilayers. By analyzing the design results of the Mo/Si multiayers with different bilayer numbers, we found that a Mo/Si multilayer with more bilayers can achieve broader phase control, but suffers from lower total throughput and a degree of circular polarization. In addition, the pulse broadenings caused by the group delay dispersions of the designed broadband QWPs were studied, and their layer distributions were investigated. The oscillating distribution of bilayer thickness in optimized multilayers was observed, which is considered to be the reason for forming the broadband phase control. Such broadband QWPs can be applied to generate a circularly polarized broadband EUV source, such as isolated attosecond pulse, directly from a linearly polarized source.

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Broadband multilayer optics for ultrafast EUV absorption spectroscopy with free electron laser radiation

Cited by 10 publications

References 39 publications

Future perspectives in solar hot plasma observations in the soft X-rays

Future perspectives in solar hot plasma observations in the soft X-rays

Extreme Ultraviolet Multilayer Nanostructures and Their Application to Solar Plasma Observations: A Review

Design of broadband transmission quarter-wave plates for polarization control of isolated attosecond pulses

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