Matthias C. Hoffmann

SLAC National Accelerator Laboratory

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Xijie Wang

Zhejiang University

Keith A. Nelson

IIT@MIT

Aaron M. Lindenberg

Stanford University

M. Kozina

Linac Coherent Light Source

János Hebling

University of Pecs

Ka-Lo Yeh

Massachusetts Institute of Technology

Emilio A. Nanni

SLAC National Accelerator Laboratory

Stephen Weathersby

SLAC National Accelerator Laboratory

James M. Glownia

SLAC National Accelerator Laboratory

Harold Y. Hwang

Stanford University

Cooperative Institutions

SLAC National Accelerator Laboratory

357

Stanford University

247

Linac Coherent Light Source

170

Menlo School

162

Universität Hamburg

126

Deutsches Elektronen-Synchrotron DESY

125

Lawrence Berkeley National Laboratory

Max Planck Society

Stanford Synchrotron Radiation Lightsource

Center for Free-Electron Laser Science

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Parallel-plate waveguides for terahertz-driven MeV electron bunch compression

Optics Express (2019)

Mohamed A. K. Othman Matthias C. Hoffmann M. Kozina Xijie Wang Renkai Li

We demonstrate the electromagnetic performance of waveguides for femtosecond electron beam bunch manipulation and compression with strong-field terahertz (THz) pulses. The compressor structure is a dispersion-free exponentially-tapered parallel-plate waveguide (PPWG) that can focus single-cycle THz pulses along one dimension. We show test results of the tapered PPWG structure using electro-optic sampling (EOS) at the interaction region with peak fields of at least 300 kV/cm, given 0.9 µJ of incoming THz energy. We also present a modified shorted design of the tapered PPWG for better beam manipulation and reduced magnetic field as an alternative to a dual-feed approach. As an example, we demonstrate that with 5 µJ of THz energy, the PPWG compresses a 2.5 MeV electron bunch by a compression factor of more than 4, achieving a bunch length of about 18 fs.

10.1364/oe.27.023791

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Citations (17)

Ultrafast X-ray pulse characterization at free-electron lasers

Nature Photonics (2012)

I. Grguraš Andreas R. Maier C. Behrens Tommaso Mazza Thomas J. Kelly

Streaking

Attosecond

10.1038/nphoton.2012.276

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Citations (200)

Large amplitude spin dynamics driven by a THz pulse in resonance with an electromagnon

T. Kubacka Jeremy A. Johnson Matthias C. Hoffmann C. Vicario S. de Jong

Multiferroics have attracted strong interest for potential applications where electric fields control magnetic order. The ultimate speed of control via magnetoelectric coupling, however, remains largely unexplored. Here, we report an experiment in which we drove spin dynamics in multiferroic TbMnO3 with an intense few-cycle terahertz (THz) light pulse tuned to resonance with an electromagnon, an electric-dipole active spin excitation. We observed the resulting spin motion using time-resolved resonant soft x-ray diffraction. Our results show that it is possible to directly manipulate atomic-scale magnetic structures with the electric field of light on a sub-picosecond time scale.

Picosecond

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Clocking Auger electrons

Nature Physics (2021)

D. C. Haynes M. Wurzer A. Schletter André Al Haddad Cosmin I. Blaga

Streaking

Attosecond

Auger effect

10.1038/s41567-020-01111-0

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Citations (9)

On ultrafast x-ray scattering methods for magnetism

Advances in Physics X (2024)

Rajan Plumley Sathya R. Chitturi Peng Cheng Tadesse A. Assefa Nicolas Burdet

With the introduction of x-ray free electron laser sources around the world, new scientific approaches for visualizing matter at fundamental length and time-scales have become possible. As it relates to magnetism and 'magnetic-type' systems, advanced scattering methods are being developed for studying ultrafast magnetic responses on the time-scales at which they occur. We describe three capabilities which have the potential to seed new directions in this area and present

Magnetism

Electron scattering

10.1080/23746149.2024.2423935

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Citations (1)

Coherent Control of High Harmonic Generation via Dual-Gas Multijet Arrays

Physical Review Letters (2011)

A. Willner F. Tavella M. Yeung T. Dzelzainis Christos Kamperidis

High harmonic generation (HHG) is a central driver of the rapidly growing field of ultrafast science. We present a novel quasiphase-matching (QPM) concept with a dual-gas multijet target leading, for the first time, to remarkable phase control between multiple HHG sources (>2) within the Rayleigh range. The alternating jet structure with driving and matching zones shows perfect coherent buildup for up to six QPM periods. Although not in the focus of the proof-of-principle studies presented here, we achieved competitive conversion efficiencies already in this early stage of development.

Harmonic

10.1103/physrevlett.107.175002

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Citations (87)

Femtosecond X-ray magnetic circular dichroism absorption spectroscopy at an X-ray free electron laser

Review of Scientific Instruments (2016)

Daniel J. Higley Konstantin Hirsch Georgi L. Dakovski Emmanuelle Jal Edwin Yuan

X-ray magnetic circular dichroism spectroscopy using an X-ray free electron laser is demonstrated with spectra over the Fe L3,2-edges. The high brightness of the X-ray free electron laser combined with high accuracy detection of incident and transmitted X-rays enables ultrafast X-ray magnetic circular dichroism studies of unprecedented sensitivity. This new capability is applied to a study of all-optical magnetic switching dynamics of Fe and Gd magnetic sublattices in a GdFeCo thin film above its magnetization compensation temperature.

Free-electron laser

Vibrational Circular Dichroism

10.1063/1.4944410

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Citations (58)

Development of a THz Pump MeV Ultrafast Electron Diffraction Probe Apparatus

Conference on Lasers and Electro-Optics (2018)

Benjamin K. Ofori-Okai Matthias C. Hoffmann Alexander H. Reid Renkai Li Xiaozhe Shen

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text B. K. Ofori-Okai, M. C. Hoffmann, A. H. Reid, R. Li, X. Shen, J. Yang, Q. Zheng, S. J. Park, E. M. Mannenbach, S. P. Weathersby, S. Edstrom, W. Polzin, A. M. Lindenberg, S. H. Glenzer, and X. Wang, "Development of a THz Pump MeV Ultrafast Electron Diffraction Probe Apparatus," in Conference on Lasers and Electro-Optics, OSA Technical Digest (online) (Optica Publishing Group, 2018), paper SM3A.1. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

10.1364/cleo_si.2018.sm3a.1

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Terahertz spectroscopy of RNA and DNA and spot array imaging

Matthias C. Hoffmann Bernd Fischer Peter Uhd Jepsen

We characterize the dielectric properties of RNA and DNA polymers, and perform THz imaging of biopolymer spot arrays. We discuss the design of a THz spectroscopy system for characterization of microscopic quantities of sample material.

Characterization

Sample (material)

Biopolymer

Imaging Spectroscopy

10.1364/otst.2005.wb2

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Citations (2)

Vegetation detection in agricultural applications with a single-chip camera

DOAJ (DOAJ: Directory of Open Access Journals) (2014)

Jörn Selbeck Volker Dworak Matthias C. Hoffmann Karl‐Heinz Dammer

Durch die Anwendung von Kameras bei der Prozesskontrolle in der Prazisionslandwirtschaft konnen Dunger, Pestizide, Maschinenzeit und Treibstoff eingespart werden. Trotz der hohen Forschungsaktivitaten auf diesem Gebiet verhindern hohe Preise fur geeignete Kamerasysteme die Anwendung in allen Bereichen der Landwirtschaft. Intelligente und kostengunstige Kameras, die fur landwirtschaftliche Anwendungen angepasst werden, konnen diesen Nachteil uberwinden. Der normalisierte differenzierte Vegetationsindex (NDVI) ist ein Algorithmus in der Bildanalyse zur Trennung von Pflanze und Boden (Hintergrund) und wird in der hier vorgestellten Untersuchung bei einer kostengunstigen Ein-Chip-Kamera implementiert und angepasst.

10.15150/lt.2014.178

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