Wilke, Robin Niklas

[["dc.contributor.author","Osterhoff, Markus"],["dc.contributor.author","Döring, Florian"],["dc.contributor.author","Eberl, Christian"],["dc.contributor.author","Wilke, Robin N."],["dc.contributor.author","Wallentin, Jesper"],["dc.contributor.author","Krebs, Hans-Ulrich"],["dc.contributor.author","Sprung, Michael"],["dc.contributor.author","Salditt, Tim"],["dc.date.accessioned","2017-09-07T11:54:07Z"],["dc.date.available","2017-09-07T11:54:07Z"],["dc.date.issued","2015"],["dc.identifier.doi","10.1117/12.2187799"],["dc.identifier.gro","3145110"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/2810"],["dc.notes.intern","Crossref Import"],["dc.notes.status","public"],["dc.publisher","SPIE"],["dc.publisher.place","Bellingham, Wash."],["dc.relation","SFB 755: Nanoscale Photonic Imaging"],["dc.relation.conference","X-ray nanoimaging: instruments and methods"],["dc.relation.eventend","2015-08-13"],["dc.relation.eventlocation","San Diego, Calif."],["dc.relation.eventstart","2015-08-12"],["dc.relation.isbn","978-1-62841-758-6"],["dc.relation.ispartof","X-ray nanoimaging: instruments and methods II: 12 - 13 August 2015, San Diego, California, United States"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Salditt (Structure of Biomolecular Assemblies and X-Ray Physics)"],["dc.subject.gro","x-ray optics"],["dc.subject.gro","x-ray imaging"],["dc.title","Progress on multi-order hard x-ray imaging with multilayer zone plates"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","116"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Journal of Applied Crystallography"],["dc.bibliographiccitation.lastpage","124"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Osterhoff, Markus"],["dc.contributor.author","Eberl, Christian"],["dc.contributor.author","Döring, Florian"],["dc.contributor.author","Wilke, Robin N."],["dc.contributor.author","Wallentin, Jesper"],["dc.contributor.author","Krebs, Hans Ulrich"],["dc.contributor.author","Sprung, Michael"],["dc.contributor.author","Salditt, Tim"],["dc.date.accessioned","2020-11-05T15:05:24Z"],["dc.date.available","2020-11-05T15:05:24Z"],["dc.date.issued","2015"],["dc.description.abstract","This article describes holographic imaging experiments using a hard X-ray multilayer zone plate (MZP) with an outermost zone width of 10nm at a photon energy of 18keV. An order-sorting aperture (OSA) is omitted and emulated during data analysis by a 'software OSA'. Scanning transmission X-ray microscopy usually carried out in the focal plane is generalized to the holographic regime. The MZP focus is characterized by a three-plane phase-retrieval algorithm to an FWHM of 10nm."],["dc.identifier.doi","10.1107/S1600576714026016"],["dc.identifier.gro","3141965"],["dc.identifier.isi","000349210700016"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13802"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/68460"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-352.6"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation","SFB 755: Nanoscale Photonic Imaging"],["dc.relation.eissn","1600-5767"],["dc.relation.issn","1600-5767"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Salditt (Structure of Biomolecular Assemblies and X-Ray Physics)"],["dc.rights.uri","https://goedoc.uni-goettingen.de/licenses"],["dc.subject.gro","x-ray optics"],["dc.subject.gro","x-ray imaging"],["dc.title","Towards multi-order hard X-ray imaging with multilayer zone plates"],["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","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","7071"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Nano Letters"],["dc.bibliographiccitation.lastpage","7076"],["dc.bibliographiccitation.volume","14"],["dc.contributor.author","Wallentin, Jesper"],["dc.contributor.author","Osterhoff, Markus"],["dc.contributor.author","Wilke, Robin N."],["dc.contributor.author","Persson, Karl-Magnus"],["dc.contributor.author","Wernersson, Lars-Erik"],["dc.contributor.author","Sprung, Michael"],["dc.contributor.author","Salditt, Tim"],["dc.date.accessioned","2017-09-07T11:45:23Z"],["dc.date.available","2017-09-07T11:45:23Z"],["dc.date.issued","2014"],["dc.description.abstract","Submicron sized sensors could allow higher resolution in X-ray imaging and diffraction measurements, which are ubiquitous for materials science and medicine. We present electrical measurements of a single 100 nm diameter InP nanowire transistor exposed to hard X-rays. The X-ray induced conductance is over 5 orders of magnitude larger than expected from reported data for X-ray absorption and carrier lifetimes. Time-resolved measurements show very long characteristic lifetimes on the order of seconds, tentatively attributed to long-lived traps, which give a strong amplification effect. As a proof of concept, we use the nanowire to directly image an X-ray nanofocus with submicron resolution."],["dc.identifier.doi","10.1021/nl5040545"],["dc.identifier.gro","3142008"],["dc.identifier.isi","000346322800049"],["dc.identifier.pmid","25419623"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/3523"],["dc.language.iso","en"],["dc.notes.intern","WoS Import 2017-03-10 / Funder: K. A. Wallenberg Foundation; Deutsche Forschungsgemeinschaft [SFB 755]"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.eissn","1530-6992"],["dc.relation.issn","1530-6984"],["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.title","Hard X-ray Detection Using a Single nm Diameter Nanowire"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","552"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Acta Crystallographica. Section A, Foundations and Advances"],["dc.bibliographiccitation.lastpage","562"],["dc.bibliographiccitation.volume","70"],["dc.contributor.author","Pennicard, D."],["dc.contributor.author","Salditt, Tim"],["dc.contributor.author","Wilke, Robin N."],["dc.contributor.author","Wallentin, Jesper"],["dc.contributor.author","Osterhoff, Markus"],["dc.contributor.author","Zozulya, Alexey V."],["dc.contributor.author","Sprung, Michael"],["dc.date.accessioned","2020-11-05T15:05:25Z"],["dc.date.available","2020-11-05T15:05:25Z"],["dc.date.issued","2014"],["dc.description.abstract","Suitable detection systems that are capable of recording high photon count rates with single-photon detection are instrumental for coherent X-ray imaging. The new single-photon-counting pixel detector `Lambda' has been tested in a ptychographic imaging experiment on solar-cell nanowires using Kirkpatrick-Baez-focused 13.8keV X-rays. Taking advantage of the high count rate of the Lambda and dynamic range expansion by the semi-transparent central stop, a high-dynamic-range diffraction signal covering more than seven orders of magnitude has been recorded, which corresponds to a photon flux density of about 10(5)photonsnm(-2)s(-1) or a flux of approximate to 10(10)photonss(-1) on the sample. By comparison with data taken without the semi-transparent central stop, an increase in resolution by a factor of 3-4 is determined: from about 125nm to about 38nm for the nanowire and from about 83nm to about 21nm for the illuminating wavefield."],["dc.identifier.doi","10.1107/S2053273314014545"],["dc.identifier.gro","3142026"],["dc.identifier.isi","000344599300004"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12169"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/68463"],["dc.notes.intern","DOI Import GROB-352.6"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.eissn","2053-2733"],["dc.relation.eissn","1600-5724"],["dc.relation.issn","0108-7673"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Salditt (Structure of Biomolecular Assemblies and X-Ray Physics)"],["dc.rights","Goescholar"],["dc.rights.uri","https://goedoc.uni-goettingen.de/licenses"],["dc.subject.gro","x-ray imaging"],["dc.title","Using invariom modelling to distinguish correct and incorrect central atoms in UPDATE 1\nUPDATE 1\nUPDATE 1\nUPDATE 1\nUPDATE 1\nUPDATE 1\nUPDATE 1\nUPDATE 1\nUPDATE 1\nUPDATE 1Lambda' based on the Medipix3 readout chip"],["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","867"],["dc.bibliographiccitation.journal","Journal of Synchrotron Radiation"],["dc.bibliographiccitation.lastpage","878"],["dc.bibliographiccitation.volume","22"],["dc.contributor.author","Salditt, Tim"],["dc.contributor.author","Osterhoff, Markus"],["dc.contributor.author","Krenkel, Martin"],["dc.contributor.author","Wilke, Robin N."],["dc.contributor.author","Priebe, Marius"],["dc.contributor.author","Bartels, Matthias"],["dc.contributor.author","Kalbfleisch, Sebastian"],["dc.contributor.author","Sprung, Michael"],["dc.date.accessioned","2017-09-07T11:43:44Z"],["dc.date.available","2017-09-07T11:43:44Z"],["dc.date.issued","2015"],["dc.description.abstract","A compound optical system for coherent focusing and imaging at the nanoscale is reported, realised by high-gain fixed-curvature elliptical mirrors in combination with X-ray waveguide optics or different cleaning apertures. The key optical concepts are illustrated, as implemented at the Gottingen Instrument for Nano-Imaging with X-rays (GINIX), installed at the P10 coherence beamline of the PETRA III storage ring at DESY, Hamburg, and examples for typical applications in biological imaging are given. Characteristic beam configurations with the recently achieved values are also described, meeting the different requirements of the applications, such as spot size, coherence or bandwidth. The emphasis of this work is on the different beam shaping, filtering and characterization methods."],["dc.identifier.doi","10.1107/S1600577515007742"],["dc.identifier.gro","3141875"],["dc.identifier.isi","000357407900001"],["dc.identifier.pmid","26134789"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/2045"],["dc.language.iso","en"],["dc.notes.intern","WoS Import 2017-03-10"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation","SFB 755: Nanoscale Photonic Imaging"],["dc.relation.eissn","1600-5775"],["dc.relation.issn","0909-0495"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Salditt (Structure of Biomolecular Assemblies and X-Ray Physics)"],["dc.subject.gro","x-ray optics"],["dc.subject.gro","x-ray imaging"],["dc.subject.gro","x-ray scattering"],["dc.title","Compound focusing mirror and X-ray waveguide optics for coherent imaging and nano-diffraction"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","490"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Journal of Synchrotron Radiation"],["dc.bibliographiccitation.lastpage","497"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Giewekemeyer, Klaus"],["dc.contributor.author","Wilke, Robin N."],["dc.contributor.author","Osterhoff, Markus"],["dc.contributor.author","Bartels, Matthias"],["dc.contributor.author","Kalbfleisch, Sebastian"],["dc.contributor.author","Salditt, Tim"],["dc.date.accessioned","2020-11-05T15:05:25Z"],["dc.date.available","2020-11-05T15:05:25Z"],["dc.date.issued","2013"],["dc.description.abstract","In the past decade Kirkpatrick-Baez (KB) mirrors have been established as powerful focusing systems in hard X-ray microscopy applications. Here a ptychographic characterization of the KB focus in the dedicated nano-imaging setup GINIX (Gottingen Instrument for Nano-Imaging with X-rays) at the P10 coherence beamline of the PETRA III synchrotron at HASLYLAB/DESY, Germany, is reported. More specifically, it is shown how aberrations in the KB beam, caused by imperfections in the height profile of the focusing mirrors, can be eliminated using a pinhole as a spatial filter near the focal plane. A combination of different pinhole sizes and illumination conditions of the KB setup makes the prepared optical setup well suited not only for high-resolution ptychographic coherent X-ray diffractive imaging but also for moderate-resolution/large-field-of-view propagation imaging in the divergent KB beam."],["dc.identifier.doi","10.1107/S0909049513005372"],["dc.identifier.gro","3142357"],["dc.identifier.isi","000317604800013"],["dc.identifier.pmid","23592629"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/68466"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-352.6"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.issn","0909-0495"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Salditt (Structure of Biomolecular Assemblies and X-Ray Physics)"],["dc.subject.gro","x-ray optics"],["dc.subject.gro","x-ray imaging"],["dc.title","Versatility of a hard X-ray Kirkpatrick–Baez focus characterized by ptychography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1167"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Journal of Synchrotron Radiation"],["dc.bibliographiccitation.lastpage","1174"],["dc.bibliographiccitation.volume","21"],["dc.contributor.author","Giewekemeyer, Klaus"],["dc.contributor.author","Philipp, Hugh T."],["dc.contributor.author","Wilke, Robin N."],["dc.contributor.author","Aquila, Andrew"],["dc.contributor.author","Osterhoff, Markus"],["dc.contributor.author","Tate, Mark W."],["dc.contributor.author","Shanks, Katherine S."],["dc.contributor.author","Zozulya, Alexey V."],["dc.contributor.author","Salditt, Tim"],["dc.contributor.author","Gruner, Sol M."],["dc.contributor.author","Mancuso, Adrian P."],["dc.date.accessioned","2020-11-05T15:05:25Z"],["dc.date.available","2020-11-05T15:05:25Z"],["dc.date.issued","2014"],["dc.description.abstract","Coherent (X-ray) diffractive imaging (CDI) is an increasingly popular form of X-ray microscopy, mainly due to its potential to produce high-resolution images and the lack of an objective lens between the sample and its corresponding imaging detector. One challenge, however, is that very high dynamic range diffraction data must be collected to produce both quantitative and high-resolution images. In this work, hard X-ray ptychographic coherent diffractive imaging has been performed at the P10 beamline of the PETRA III synchrotron to demonstrate the potential of a very wide dynamic range imaging X-ray detector (the Mixed-Mode Pixel Array Detector, or MM-PAD). The detector is capable of single photon detection, detecting fluxes exceeding 1 x 10(8) 8-keV photons pixel(-1) s(-1), and framing at 1 kHz. A ptychographic reconstruction was performed using a peak focal intensity on the order of 1 x 10(10) photons mu m(-2) s(-1) within an area of approximately 325 nm x 603 nm. This was done without need of a beam stop and with a very modest attenuation, while 'still' images of the empty beam far-field intensity were recorded without any attenuation. The treatment of the detector frames and CDI methodology for reconstruction of non-sensitive detector regions, partially also extending the active detector area, are described."],["dc.identifier.doi","10.1107/S1600577514013411"],["dc.identifier.gro","3142063"],["dc.identifier.isi","000341687000034"],["dc.identifier.pmid","25178008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/68464"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-352.6"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.eissn","1600-5775"],["dc.relation.issn","1600-5775"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Salditt (Structure of Biomolecular Assemblies and X-Ray Physics)"],["dc.rights","CC BY 2.0"],["dc.subject.gro","x-ray imaging"],["dc.title","High-dynamic-range coherent diffractive imaging: ptychography using the mixed-mode pixel array detector"],["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"]]