Sivis, Murat

[["dc.bibliographiccitation.artnumber","eaao4641"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Science Advances"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Kfir, Ofer"],["dc.contributor.author","Zayko, Sergey"],["dc.contributor.author","Nolte, Christina"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Möller, Marcel"],["dc.contributor.author","Hebler, Birgit"],["dc.contributor.author","Arekapudi, Sri Sai Phani Kanth"],["dc.contributor.author","Steil, Daniel"],["dc.contributor.author","Schäfer, Sascha"],["dc.contributor.author","Albrecht, Manfred"],["dc.contributor.author","Cohen, Oren"],["dc.contributor.author","Mathias, Stefan Dirk"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2019-11-28T10:23:22Z"],["dc.date.available","2019-11-28T10:23:22Z"],["dc.date.issued","2017"],["dc.description.abstract","This work demonstrates nanoscale magnetic imaging using bright circularly polarized high-harmonic radiation. We utilize the magneto-optical contrast of worm-like magnetic domains in a Co/Pd multilayer structure, obtaining quantitative amplitude and phase maps by lensless imaging. A diffraction-limited spatial resolution of 49 nm is achieved with iterative phase reconstruction enhanced by a holographic mask. Harnessing the exceptional coherence of high harmonics, this approach will facilitate quantitative, element-specific, and spatially resolved studies of ultrafast magnetization dynamics, advancing both fundamental and applied aspects of nanoscale magnetism."],["dc.identifier.doi","10.1126/sciadv.aao4641"],["dc.identifier.pmid","29250601"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62695"],["dc.language.iso","en"],["dc.relation.eissn","2375-2548"],["dc.relation.issn","2375-2548"],["dc.title","Nanoscale magnetic imaging using circularly polarized high-harmonic radiation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","FW4M.4"],["dc.contributor.author","Zayko, Sergey"],["dc.contributor.author","Kfir, Ofer"],["dc.contributor.author","Heigl, Michael"],["dc.contributor.author","Lohmann, Michael"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Albrecht, Manfred"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2020-05-15T11:57:49Z"],["dc.date.available","2020-05-15T11:57:49Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1364/CLEO_QELS.2019.FW4M.4"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65453"],["dc.relation.conference","Conference on Lasers and Electro-Optics: Applications"],["dc.relation.eventend","2019-05-10"],["dc.relation.eventlocation","San Jose, California"],["dc.relation.eventstart","2019-05-05"],["dc.relation.isbn","978-1-943580-57-6"],["dc.relation.ispartof","CLEO: Applications and Technology : part of CLEO: 2019 : 5-10 May 2019, San Jose, California, United States"],["dc.title","Ultrafast Magnetic Microscopy using High-Harmonic Radiation"],["dc.type","conference_paper"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.lastpage","1"],["dc.contributor.author","Zayko, Sergey"],["dc.contributor.author","Kfir, Ofer"],["dc.contributor.author","Heigl, Michael"],["dc.contributor.author","Lohmann, Michael"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Albrecht, Manfred"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2020-05-15T11:57:43Z"],["dc.date.available","2020-05-15T11:57:43Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1109/CLEOE-EQEC.2019.8871878"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65452"],["dc.relation.conference","2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)"],["dc.relation.eventend","2019-06-27"],["dc.relation.eventlocation","München"],["dc.relation.eventstart","2019-06-23"],["dc.relation.isbn","978-1-7281-0469-0"],["dc.relation.ispartof","European Quantum Electronics Conference : part of 2019 Conference on Lasers and Electro-Optics Europe and European Electronics Conference : 23-27 June 2019, Munich, Germany"],["dc.title","Ultrafast Spin Dynamics Resolved with High-Harmonic Generation Microscopy"],["dc.type","conference_paper"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","Th1B.4"],["dc.contributor.author","Zayko, Sergey"],["dc.contributor.author","Kfir, Ofer"],["dc.contributor.author","Heigl, Michael"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Albrecht, Manfred"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2020-05-15T12:39:58Z"],["dc.date.available","2020-05-15T12:39:58Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1364/CLEOPR.2018.Th1B.4"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65458"],["dc.relation.eventend","2018-08-03"],["dc.relation.eventlocation","Hong Kong, China"],["dc.relation.eventstart","2018-07-29"],["dc.relation.isbn","978-1-943580-45-3"],["dc.relation.ispartof","Conference on Lasers and Electro-Optics/Pacific Rim : 29 July-3 August 2018, Hong Kong, China"],["dc.title","Magnetic sub-Wavelength Imaging using High-Harmonic Radiation"],["dc.type","conference_paper"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","46"],["dc.bibliographiccitation.issue","7810"],["dc.bibliographiccitation.journal","Nature"],["dc.bibliographiccitation.lastpage","49"],["dc.bibliographiccitation.volume","582"],["dc.contributor.author","Kfir, Ofer"],["dc.contributor.author","Lourenço-Martins, Hugo"],["dc.contributor.author","Storeck, Gero"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Harvey, Tyler R."],["dc.contributor.author","Kippenberg, Tobias J."],["dc.contributor.author","Feist, Armin"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2021-04-14T08:25:47Z"],["dc.date.available","2021-04-14T08:25:47Z"],["dc.date.issued","2020"],["dc.description.abstract","Free-electron beams serve as uniquely versatile probes of microscopic structure and composition, and have repeatedly revolutionized atomic-scale imaging, from solid-state physics to structural biology. Over the past decade, the manipulation and interaction of electrons with optical fields has seen significant progress, enabling novel imaging methods, schemes of near-field electron acceleration, and culminating in 4D microscopy techniques with both high temporal and spatial resolution. However, weak coupling strengths of electron beams to optical excitations are a standing issue for existing and emerging applications of optical free-electron control. Here, we demonstrate phase matched near-field coupling of a free-electron beam to optical whispering gallery modes of dielectric microresonators. The cavity-enhanced interaction with these optically excited modes imprints a strong phase modulation on co-propagating electrons, which leads to electron-energy sidebands up to hundreds of photon orders and a spectral broadening of 700 eV. Mapping the near-field interaction with ultrashort electron pulses in space and time, we trace the temporal ring-down of the microresonator following a femtosecond excitation and observe the cavity's resonant spectral response. Resonantly enhancing the coupling of electrons and light via optical cavities, with efficient injection and extraction, can open up novel applications such as continuous-wave acceleration, attosecond structuring, and real-time all-optical electron detection."],["dc.identifier.arxiv","1910.09540v1"],["dc.identifier.doi","10.1038/s41586-020-2320-y"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81731"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1476-4687"],["dc.relation.issn","0028-0836"],["dc.title","Controlling free electrons with optical whispering-gallery modes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","3723"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Nature Communications"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Heinrich, Tobias"],["dc.contributor.author","Taucer, Marco"],["dc.contributor.author","Kfir, Ofer"],["dc.contributor.author","Corkum, P. B."],["dc.contributor.author","Staudte, André"],["dc.contributor.author","Ropers, Claus"],["dc.contributor.author","Sivis, Murat"],["dc.date.accessioned","2021-07-05T15:00:30Z"],["dc.date.available","2021-07-05T15:00:30Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract Strong-field methods in solids enable new strategies for ultrafast nonlinear spectroscopy and provide all-optical insights into the electronic properties of condensed matter in reciprocal and real space. Additionally, solid-state media offers unprecedented possibilities to control high-harmonic generation using modified targets or tailored excitation fields. Here we merge these important points and demonstrate circularly-polarized high-harmonic generation with polarization-matched excitation fields for spectroscopy of chiral electronic properties at surfaces. The sensitivity of our approach is demonstrated for structural helicity and termination-mediated ferromagnetic order at the surface of silicon-dioxide and magnesium oxide, respectively. Circularly polarized radiation emanating from a solid sample now allows to add basic symmetry properties as chirality to the arsenal of strong-field spectroscopy in solids. Together with its inherent temporal (femtosecond) resolution and non-resonant broadband spectrum, the polarization control of high harmonics from condensed matter can illuminate ultrafast and strong field dynamics of surfaces, buried layers or thin films."],["dc.description.abstract","Abstract Strong-field methods in solids enable new strategies for ultrafast nonlinear spectroscopy and provide all-optical insights into the electronic properties of condensed matter in reciprocal and real space. Additionally, solid-state media offers unprecedented possibilities to control high-harmonic generation using modified targets or tailored excitation fields. Here we merge these important points and demonstrate circularly-polarized high-harmonic generation with polarization-matched excitation fields for spectroscopy of chiral electronic properties at surfaces. The sensitivity of our approach is demonstrated for structural helicity and termination-mediated ferromagnetic order at the surface of silicon-dioxide and magnesium oxide, respectively. Circularly polarized radiation emanating from a solid sample now allows to add basic symmetry properties as chirality to the arsenal of strong-field spectroscopy in solids. Together with its inherent temporal (femtosecond) resolution and non-resonant broadband spectrum, the polarization control of high harmonics from condensed matter can illuminate ultrafast and strong field dynamics of surfaces, buried layers or thin films."],["dc.identifier.doi","10.1038/s41467-021-23999-9"],["dc.identifier.pii","23999"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/87839"],["dc.language.iso","en"],["dc.notes.intern","DOI Import DOI-Import GROB-441"],["dc.relation.eissn","2041-1723"],["dc.title","Chiral high-harmonic generation and spectroscopy on solid surfaces using polarization-tailored strong fields"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","FM4F.3"],["dc.contributor.author","Zayko, Sergey"],["dc.contributor.author","Kfir, Ofer"],["dc.contributor.author","Heigl, Michael"],["dc.contributor.author","Nolte, Christina"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Möller, Marcel"],["dc.contributor.author","Arekapudi, Sri Sai Phani Kanth"],["dc.contributor.author","Hebler, Birgit"],["dc.contributor.author","Steil, Daniel"],["dc.contributor.author","Schäfer, Sascha"],["dc.contributor.author","Albrecht, Manfred"],["dc.contributor.author","Cohen, Oren"],["dc.contributor.author","Mathias, Stefan"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2020-05-15T12:39:52Z"],["dc.date.available","2020-05-15T12:39:52Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1364/CLEO_QELS.2018.FM4F.3"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65457"],["dc.relation.conference","CLEO: Science and Innovations"],["dc.relation.eventend","2018-05-18"],["dc.relation.eventlocation","San Jose, California"],["dc.relation.eventstart","2018-05-13"],["dc.relation.isbn","978-1-943580-42-2"],["dc.relation.ispartof","CLEO: Science and Innovations : part of CLEO: 2018 : 13-18 May 2018, San Jose, California, United States"],["dc.title","Nanoscale Magnetic Imaging using High-Harmonic Radiation"],["dc.type","conference_paper"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","FW1H.8"],["dc.contributor.author","Zayko, Sergey"],["dc.contributor.author","Kfir, Ofer"],["dc.contributor.author","Nolte, Christina"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Möller, Marcel"],["dc.contributor.author","Ganss, Fabian"],["dc.contributor.author","Hebler, Birgit"],["dc.contributor.author","Steil, Daniel"],["dc.contributor.author","Schäfer, Sascha"],["dc.contributor.author","Albrecht, Manfred"],["dc.contributor.author","Cohen, Oren"],["dc.contributor.author","Mathias, Stefan"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2020-05-15T12:46:14Z"],["dc.date.available","2020-05-15T12:46:14Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1364/CLEO_QELS.2017.FW1H.8"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65461"],["dc.relation.eventend","2017-05-19"],["dc.relation.eventlocation","San Jose, California"],["dc.relation.eventstart","2017-05-14"],["dc.relation.isbn","978-1-943580-27-9"],["dc.relation.ispartof","2017 Conference on Lasers and Electro-Optics (CLEO) : proceedings : San Jose, California, USA, 14-19 May 2017"],["dc.title","Nanoscale Imaging of Magnetic Domains using a High-Harmonic Source"],["dc.type","conference_paper"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.contributor.author","Zayko, Sergey"],["dc.contributor.author","Kfir, Ofer"],["dc.contributor.author","Nolte, Christina"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Moller, Marcel"],["dc.contributor.author","Ganss, Fabian"],["dc.contributor.author","Hebler, Birgit"],["dc.contributor.author","Steil, Daniel"],["dc.contributor.author","Schafer, Sascha"],["dc.contributor.author","Albrecht, Manfred"],["dc.contributor.author","Cohen, Oren"],["dc.contributor.author","Mathias, Stefan"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2020-06-02T10:08:27Z"],["dc.date.available","2020-06-02T10:08:27Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1109/CLEOE-EQEC.2017.8087592"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/66052"],["dc.relation.conference","European Quantum Electronics Conference"],["dc.relation.eventend","2017-06-29"],["dc.relation.eventlocation","München"],["dc.relation.eventstart","2017-06-25"],["dc.relation.isbn","978-1-5090-6736-7"],["dc.relation.ispartof","European Quantum Electronics Conference"],["dc.title","Nanoscale magnetic imaging using a compact high-harmonic source"],["dc.type","conference_paper"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]