Wilke, Robin Niklas

[["dc.bibliographiccitation.firstpage","1818"],["dc.bibliographiccitation.journal","Journal of Applied Crystallography"],["dc.bibliographiccitation.lastpage","1826"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Wallentin, Jesper"],["dc.contributor.author","Wilke, Robin N."],["dc.contributor.author","Osterhoff, Markus"],["dc.contributor.author","Salditt, Tim"],["dc.date.accessioned","2017-09-07T11:54:51Z"],["dc.date.available","2017-09-07T11:54:51Z"],["dc.date.issued","2015"],["dc.description.abstract","Simultaneous scanning Bragg contrast and small-angle ptychographic imaging of a single solar cell nanowire are demonstrated, using a nanofocused hard X-ray beam and two detectors. The 2.5 mu m-long nanowire consists of a single-crystal InP core of 190 nm diameter, coated with amorphous SiO2 and polycrystalline indium tin oxide. The nanowire was selected and aligned in real space using the small-angle scattering of the 140 x 210 nm X-ray beam. The orientation of the nanowire, as observed in small-angle scattering, was used to find the correct rotation for the Bragg condition. After alignment in real space and rotation, high-resolution (50 nm step) raster scans were performed to simultaneously measure the distribution of small-angle scattering and Bragg diffraction in the nanowire. Ptychographic reconstruction of the coherent small-angle scattering was used to achieve sub-beam spatial resolution. The small-angle scattering images, which are sensitive to the shape and the electron density of all parts of the nanowire, showed a homogeneous profile along the nanowire axis except at the thicker head region. In contrast, the scanning Bragg diffraction microscopy, which probes only the single-crystal InP core, revealed bending and crystalline inhomogeneity. Both systematic and non-systematic real-space movement of the nanowire were observed as it was rotated, which would have been difficult to reveal only from the Bragg scattering. These results demonstrate the advantages of simultaneously collecting and analyzing the small-angle scattering in Bragg diffraction experiments."],["dc.identifier.doi","10.1107/S1600576715017975"],["dc.identifier.gro","3141777"],["dc.identifier.isi","000365774800026"],["dc.identifier.pmid","26664342"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12753"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/957"],["dc.notes.intern","WoS Import 2017-03-10 / Funder: K.A. Wallenberg Foundation; Deutsche Forschungsgemeinschaft [SFB 755]"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.issn","1600-5767"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Salditt (Structure of Biomolecular Assemblies and X-Ray Physics)"],["dc.subject.gro","x-ray imaging"],["dc.subject.gro","x-ray scattering"],["dc.title","Simultaneous high-resolution scanning Bragg contrast and ptychographic imaging of a single solar cell nanowire"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","19232"],["dc.bibliographiccitation.issue","17"],["dc.bibliographiccitation.journal","Optics Express"],["dc.bibliographiccitation.lastpage","19254"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Wilke, Robin N."],["dc.contributor.author","Priebe, Marius"],["dc.contributor.author","Bartels, Matthias"],["dc.contributor.author","Giewekemeyer, Klaus"],["dc.contributor.author","Diaz, Ana"],["dc.contributor.author","Karvinen, P."],["dc.contributor.author","Salditt, Tim"],["dc.date.accessioned","2017-09-07T11:48:27Z"],["dc.date.available","2017-09-07T11:48:27Z"],["dc.date.issued","2012"],["dc.description.abstract","Ptychographic coherent X-ray diffractive imaging (PCDI) has been combined with nano-focus X-ray diffraction to study the structure and density distribution of unstained and unsliced bacterial cells, using a hard X-ray beam of 6.2keV photon energy, focused to about 90nm by a Fresnel zone plate lens. While PCDI provides images of the bacteria with quantitative contrast in real space with a resolution well below the beam size at the sample, spatially resolved small angle X-ray scattering using the same Fresnel zone plate (cellular nano-diffraction) provides structural information at highest resolution in reciprocal space up to 2nm(-1). We show how the real and reciprocal space approach can be used synergistically on the same sample and with the same setup. In addition, we present 3D hard X-ray imaging of unstained bacterial cells by a combination of ptychography and tomography. (C) 2012 Optical Society of America"],["dc.identifier.doi","10.1364/OE.20.019232"],["dc.identifier.fs","589591"],["dc.identifier.gro","3142482"],["dc.identifier.isi","000307873600075"],["dc.identifier.pmid","23038565"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/9566"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/8773"],["dc.language.iso","en"],["dc.notes.intern","WoS Import 2017-03-10 / Funder: Deutsche Forschungsgemeinschaft [SFB 755]"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.issn","1094-4087"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.workinggroup","RG Salditt (Structure of Biomolecular Assemblies and X-Ray Physics)"],["dc.subject.gro","x-ray imaging"],["dc.subject.gro","x-ray scattering"],["dc.title","Hard X-ray imaging of bacterial cells: nano-diffraction and ptychographic reconstruction"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]