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Towards compact x-ray microscopy with liquid-nitrogen-jet laser-plasma source
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Biomedicinsk fysik och röntgenfysik.
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Biomedicinsk fysik och röntgenfysik.ORCID-id: 0000-0002-4394-0591
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Biomedicinsk fysik och röntgenfysik.ORCID-id: 0000-0003-2723-6622
2006 (engelsk)Inngår i: Proceedings of 8th International Conference on X-ray Microscopy, 2006, s. 12-14Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

In this contribution we present source properties and design considerations for a compact x-ray microscope operating in the water-window spectral region at 2.48 nm. The microscope will use a liquid-nitrogen-jet laser-plasma source with sufficient brightness, uniformity, stability and reliability for microscopy operation. The source is quantitatively characterized by calibrated slitgrating spectroscopy and zone-plate imaging to determine absolute photon numbers and source size and stability. Calculations including sources parameters as well as characteristics of available x-ray optics indicate that high-quality microscope images can be obtained with exposure times in the range of few minutes.

sted, utgiver, år, opplag, sider
2006. s. 12-14
Serie
IPAP Conf. series ; 7
Emneord [en]
X-ray microscopy, laser-plasma x-ray source
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-7022OAI: oai:DiVA.org:kth-7022DiVA, id: diva2:11897
Konferanse
8th International Conference on X-ray Microscopy
Merknad
QC 20100820Tilgjengelig fra: 2007-04-20 Laget: 2007-04-20 Sist oppdatert: 2010-08-20bibliografisk kontrollert
Inngår i avhandling
1. Compact Soft X-Ray Microscopy: Sources, Optics and Instrumentation
Åpne denne publikasjonen i ny fane eller vindu >>Compact Soft X-Ray Microscopy: Sources, Optics and Instrumentation
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis describes the development of a sub-60-nm full-period resolution compact soft x-ray microscope operating in the water-window region (2.3-4.4 nm). Soft x-ray water-window microscopy is a powerful technique for high-resolution imaging of organic materials exploiting the natural contrast mechanism between carbon and oxygen, cf. Sect. 4.1. The thesis discusses the components of, as well as the integration of the microscope, including liquid-jet laser-plasma x-ray sources, optics, simulations, and image-processing tools.

Liquid-jet-target laser-plasma sources for generation of soft x-rays and extreme-ultraviolet radiation are compact sources with high brightness. The work focused on improved target stability, decreased debris, and accurate source characterization. For x ray microscopy applications a liquid-jet target delivery system allowing cryogenic liquids was developed. Source characterization was performed for two different liquid-jet targets: Methanol and liquid nitrogen. For extreme-ultraviolet lithography applications, the potential use of a liquid-tin-jet laser-plasma source was explored including conversion efficiency and debris measurements.

High quality optics are essential in the development of compact x-ray microscopes. For soft x-ray wavelengths, zone plates and multilayer mirrors are used to focus or redirect radiation. This thesis describes the development and characterization of a condenser zone plate suitable for use in a compact soft x-ray microscope operating at λ = 2.478 nm. It also investigates the possibility to perform differential interference contrast microscopy in the water window using a single diffractive optical element. An arrangement for rapid and accurate determination of absolute and local diffraction efficiency of soft x-ray zone plates using a compact laser-plasma source has been developed. The instrument is used to characterize the zone plates fabricated at the Biomedical & X-Ray Physics division at KTH. Through a collaboration with the Fraunhofer-Institut in Jena, Germany, a large diameter spherical Cr/Sc multilayer mirror, suitable as condenser in the compact x-ray microscope, was developed and characterized. The mirror is designed for λ = 3.374 nm and shows a high, and uniform reflectivity of 3%. This increases the photon flux by an order of magnitude compared to the W/B4C mirrors previously used.

The thesis describes the development of a compact soft x-ray microscope with sub-60-nm full-period resolution. It can operate at two different wavelengths in the water window using the soft x-ray laser-plasma sources combined with the condenser optics described above. Imaging is performed by zone plate objectives. The microscope is capable of imaging hydrated biological samples with thicknesses up to ~10 μm. Improvements made to the mechanical design has turned it into a user friendly instrument allowing daily operation. A numerical method was developed to study the effects of partially coherent illumination on 2D imaging. To stimulate experiments on functional imaging in x-ray microscopy an image-analysis algorithm for identifying colloidal-gold particles was developed. Size selective identification and localization of single gold particles down to a diameter of 50 nm was demonstrated.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2007. s. x, 59
Serie
Trita-FYS, ISSN 0280-316X ; 2007:25
Emneord
soft x-ray microscopy, water window, compact, laser plasma, liquid jet, zone plate optics
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4342 (URN)978-91-7178-613-5 (ISBN)
Disputas
2007-05-04, FD 5, Albanova, Roslagstullsbacken 21, Stockholm, 13:00
Opponent
Veileder
Merknad
QC 20100819Tilgjengelig fra: 2007-04-20 Laget: 2007-04-20 Sist oppdatert: 2010-08-20bibliografisk kontrollert

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Biomedical and X-Ray Physics, KTH

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Vogt, UlrichHertz, Hans

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