Experimental evaluation of signal-to-noise in spectro-holography via modified uniformly redundant arrays in the soft x-ray and extreme ultraviolet spectral regime

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dc.contributor.authorGünther, Christian M.
dc.contributor.authorGuehrs, Erik
dc.contributor.authorSchneider, Michael
dc.contributor.authorPfau, Bastian
dc.contributor.authorKorff Schmising, Clemens von
dc.contributor.authorGeilhufe, Jan
dc.contributor.authorSchaffert, Stefan
dc.contributor.authorEisebitt, Stefan
dc.date.accessioned2020-05-20T16:08:02Z
dc.date.available2020-05-20T16:08:02Z
dc.date.issued2017
dc.description.abstractWe present dichroic x-ray lensless magnetic imaging by Fourier transform holography with an extended reference scheme via a modified uniformly redundant array (mURA). Holographic images of magnetic domains simultaneously generated by a single pinhole reference as well as by a mURA reference are compared with respect to the signal-to-noise ratio (SNR) as a function of exposure time. We apply this approach for spectro-holographic imaging of ferromagnetic domain patterns in Co/Pt multilayer films. Soft x-rays with wavelengths of 1.59 nm (Co L 3 absorption edge) and 20.8 nm (Co M 2,3 absorption edges) are used for image formation and to generate contrast via x-ray magnetic circular dichroism. For a given exposure time, the mURA-based holography allows to decouple the reconstruction SNR from the spatial resolution. For 1.59 nm wavelength, the reconstruction via the extended reference scheme shows no significant loss of spatial resolution compared to the single pinhole reference. In contrast, at 20.8 nm wavelength the single pinhole reveals some very intricate features which are lost in the image generated by the mURA, although overall a high-quality image is generated. The SNR-advantage of the mURA scheme is most notable when the hologram has to be encoded with few photons, while errors associated with the increased complexity of the reconstruction process reduce the advantage for high-photon-number experiments.en
dc.description.sponsorshipBMBF, 05K13KT3, Verbundprojekt 05K2013 - DynaMaX: Messplatz für ultraschnelle Dynamik bei BESSY II. Teilprojekt 1en
dc.identifier.eissn2040-8986
dc.identifier.issn2040-8978
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/11186
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-10077
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/
dc.subject.ddc530 Physikde
dc.subject.othermagnetic circular dichroismen
dc.subject.otherimaging and optical processingen
dc.subject.otherholographyen
dc.subject.otherx-rayen
dc.subject.otherimagingen
dc.subject.otherdiffraction efficiencyen
dc.subject.otherresolution and other hologram characteristicsen
dc.subject.othermagnetic domains in thin filmsen
dc.titleExperimental evaluation of signal-to-noise in spectro-holography via modified uniformly redundant arrays in the soft x-ray and extreme ultraviolet spectral regimeen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber64002
dcterms.bibliographicCitation.doi10.1088/2040-8986/aa6380
dcterms.bibliographicCitation.issue6
dcterms.bibliographicCitation.journaltitleJournal of Opticsen
dcterms.bibliographicCitation.originalpublishernameIOP Publishingen
dcterms.bibliographicCitation.originalpublisherplaceBristolen
dcterms.bibliographicCitation.volume19
tub.accessrights.dnbfree
tub.affiliationFak. 2 Mathematik und Naturwissenschaften::Inst. Optik und Atomare Physik::FG Röntgenoptik und Nanometer-Optikde
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.groupFG Röntgenoptik und Nanometer-Optikde
tub.affiliation.instituteInst. Optik und Atomare Physikde
tub.publisher.universityorinstitutionTechnische Universität Berlinde

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