Wimmer, Lara

[["dc.bibliographiccitation.artnumber","131102"],["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Applied Physics Letters"],["dc.bibliographiccitation.volume","111"],["dc.contributor.author","Wimmer, Lara"],["dc.contributor.author","Schröder, Benjamin"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Herink, Georg"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2019-11-28T10:28:21Z"],["dc.date.available","2019-11-28T10:28:21Z"],["dc.date.issued","2017"],["dc.description.abstract","We apply terahertz (THz) near-field streaking in a nanofocusing geometry to investigate plasmon polariton propagation on the shaft of a conical nanotip. By evaluating the delay between a streaking spectrogram for plasmon-induced photoemission with a measurement for direct apex excitation, we obtain an average plasmon group velocity, which is in agreement with numerical simulations. Combining plasmon-induced photoemission with THz near-field streaking facilitates extensive control over localized photoelectron sources for time-resolved imaging and diffraction."],["dc.identifier.doi","10.1063/1.4991860"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62697"],["dc.language.iso","en"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area C | C04 Untersuchung und Kontrolle photochemischer Reaktionen durch lokale optische Anregung im Rastertunnelmikroskop"],["dc.relation.issn","0003-6951"],["dc.relation.issn","1077-3118"],["dc.title","Clocking plasmon nanofocusing by THz near-field streaking"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","233"],["dc.bibliographiccitation.lastpage","258"],["dc.contributor.author","Wimmer, Lara"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Herink, Georg"],["dc.contributor.author","Yalunin, Sergey Valerevich"],["dc.contributor.author","Echternkamp, K. E."],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2019-11-28T10:17:15Z"],["dc.date.available","2019-11-28T10:17:15Z"],["dc.date.issued","2016"],["dc.description.abstract","This Chapter presents recent findings on nonlinear ionization and photoemission processes at metallic nanostructures. A particular emphasis is placed on processes which—due to the localized excitation in optical near-fields—exhibit different properties and scalings from their counterparts in the gas phase or at planar surfaces. The Chapter is structured in two parts. The first part discusses various regimes in highly nonlinear photoelectron emission from metallic nanotips, including field-driven photoemission at near- and mid-infrared frequencies, and the control of localized photoemission using intense terahertz transients. In the second part, multiphoton and strong-field ionization of atomic gases in plasmonic antennas and waveguides is presented. It is demonstrated that local ionization is enabled by optical field enhancements in various types of structures. At the same time, fundamental physical limitations preventing efficient high-harmonic generation in nanostructures are discussed."],["dc.identifier.doi","10.1007/978-3-319-20173-3_10"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62693"],["dc.language.iso","en"],["dc.publisher","Springer"],["dc.relation.isbn","978-3-319-20172-6"],["dc.relation.isbn","978-3-319-20173-3"],["dc.relation.ispartof","Ultrafast Dynamics Driven by Intense Light Pulses"],["dc.relation.issn","1615-5653"],["dc.relation.issn","2197-6791"],["dc.title","Highly Nonlinear and Ultrafast Optical Phenomena in Metallic Nanostructures"],["dc.type","book_chapter"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","165416"],["dc.bibliographiccitation.issue","16"],["dc.bibliographiccitation.journal","Physical Review. B"],["dc.bibliographiccitation.volume","95"],["dc.contributor.author","Wimmer, Lara"],["dc.contributor.author","Karnbach, Oliver"],["dc.contributor.author","Herink, Georg"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2020-12-10T18:25:03Z"],["dc.date.available","2020-12-10T18:25:03Z"],["dc.date.issued","2017"],["dc.description.abstract","We present a comprehensive experimental and numerical study of photoelectron streaking at metallic nanotips using single-cycle terahertz (THz) transients and a static bias voltage as an external control parameter. Analyzing bias voltage dependent streaking spectrograms, we explore the THz-induced reshaping of photoelectron energy spectra, governed by the superimposed static field. Numerical simulations are employed to determine the local field strengths and spatial decay lengths of the field contributions, demonstrating electron trajectory control and the manipulation of the phase space distributions in confined fields with both dynamic and static components."],["dc.identifier.doi","10.1103/PhysRevB.95.165416"],["dc.identifier.eissn","2469-9969"],["dc.identifier.isi","000401768800003"],["dc.identifier.issn","2469-9950"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75563"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.issn","2469-9969"],["dc.relation.issn","2469-9950"],["dc.title","Phase space manipulation of free-electron pulses from metal nanotips using combined terahertz near fields and external biasing"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","432"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Nature Physics"],["dc.bibliographiccitation.lastpage","436"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Wimmer, Lara"],["dc.contributor.author","Herink, Georg"],["dc.contributor.author","Solli, Daniel R."],["dc.contributor.author","Yalunin, Sergey V."],["dc.contributor.author","Echternkamp, Katharina E."],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2018-11-07T09:39:35Z"],["dc.date.available","2018-11-07T09:39:35Z"],["dc.date.issued","2014"],["dc.description.abstract","The active control of matter by strong electromagnetic fields is of growing importance, with applications all across the optical spectrum from the extreme-ultraviolet to the far-infrared. In recent years, phase-stable terahertz fields have shown tremendous potential for observing and manipulating elementary excitations in solids(1-3). In the gas phase, on the other hand, driving free charges with terahertz transients provides insight into ultrafast ionization dynamics(4,5). Developing such approaches for locally enhanced terahertz fields in nanostructures will create new means to govern electron currents on the nanoscale. Here, we use single-cycle terahertz transients to demonstrate extensive control over nanotip photoelectron emission. The terahertz near-field is shown to either enhance or suppress photocurrents, with the tip acting as an ultrafast rectifying diode(6). We record phase-resolved sub-cycle dynamics and find spectral compression and expansion arising from electron propagation within the terahertz near-field. These interactions produce rich spectro-temporal features and offer unprecedented control over ultrashort free electron pulses for imaging and diffraction."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [DFG-SPP 1391, ZuK 45/1]"],["dc.identifier.doi","10.1038/NPHYS2974"],["dc.identifier.isi","000336969500019"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33316"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Nature Publishing Group"],["dc.relation.issn","1745-2481"],["dc.relation.issn","1745-2473"],["dc.title","Terahertz control of nanotip photoemission"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","123005"],["dc.bibliographiccitation.journal","New Journal of Physics"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Herink, Georg"],["dc.contributor.author","Wimmer, Lara"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2018-11-07T09:31:32Z"],["dc.date.available","2018-11-07T09:31:32Z"],["dc.date.issued","2014"],["dc.description.abstract","We demonstrate ultrafast terahertz (THz) field emission from a tungsten nanotip enabled by local field enhancement. Characteristic electron spectra which result from acceleration in the THz near-field are found. Employing a dual frequency pump-probe scheme, we temporally resolve different nonlinear photoemission processes induced by coupling near-infrared (NIR) and THz pulses. In the order of increasing THz field strength, we observe THz streaking, THz-induced barrier reduction (Schottky effect) and THz field emission. At intense NIR-excitation, the THz field emission is used as an ultrashort, local probe of hot electron dynamics in the apex. A first application of this scheme indicates a decreased carrier cooling rate in the confined tip geometry. Summarizing the results at various excitation conditions, we present a comprehensive picture of the distinct regimes in ultrafast photoemission in the near-and far-infrared."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [DFG-SPP 1391, ZuK 45/1]"],["dc.identifier.doi","10.1088/1367-2630/16/12/123005"],["dc.identifier.fs","607949"],["dc.identifier.isi","000346821400005"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11771"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31552"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","1367-2630"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 3.0"],["dc.title","Field emission at terahertz frequencies: AC-tunneling and ultrafast carrier dynamics"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]