Volume 12 Issue 6, June 2018

Volume 12 Issue 6

Terahertz electron accelerators

Artistic image of an electron accelerator that operates by the interaction between single-cycle terahertz pulses and electron bunches. The accelerator is composed of arrays of parallel metal waveguides that feature a dielectric filling in order to phase match the terahertz–electron interaction. It can perform complex, high gradient operations on ultrashort electron bunches.

See Zhang et al.

Image: DESY/Lucid. Berlin. Cover Design: Bethany Vukomanovic

Editorial

  • Editorial |

    Progress in silicon photonics is delivering chips that can densely pack photonics and electronics together and perform multidimensional quantum information processing.

Books & Arts

Research Highlights

News & Views

  • News & Views |

    The electromagnetic instability associated with a dense, ultra-relativistic electron beam propagating in a thin conductor could offer a new approach to realizing ultra-bright sources of gamma-rays.

    • Andrea Macchi
    •  & Francesco Pegoraro
  • News & Views |

    The polarization state of isolated attosecond pulses generated by high-order harmonic generation can now be manipulated at will. The development opens the door for a multitude of ultrafast experiments to investigate chiral media.

    • Emma R. Simpson
    •  & Johan Mauritsson

Letters

  • Letter |

    The generation of gamma-ray flashes by dense ultra-relativistic electron beams travelling across a millimetre-thickness solid conductor is theoretically investigated. Peak brilliance above 1025 photons s−1 mrad−2 mm−2 per 0.1% bandwidth is expected.

    • Alberto Benedetti
    • , Matteo Tamburini
    •  & Christoph H. Keitel

Articles

  • Article |

    The Bloch–Siegert shift—a strong-field phenomenon that implies a failure of the rotating-wave approximation—is observed in the polariton dispersion diagram of a two-dimensional electron gas system inside a high-Q terahertz photonic crystal cavity.

    • Xinwei Li
    • , Motoaki Bamba
    • , Qi Zhang
    • , Saeed Fallahi
    • , Geoff C. Gardner
    • , Weilu Gao
    • , Minhan Lou
    • , Katsumasa Yoshioka
    • , Michael J. Manfra
    •  & Junichiro Kono
  • Article |

    The direct generation of mid-infrared optical frequency combs in the region 2.5–4.0 μm from a 1.55-μm conventional and compact erbium-fibre-based femtosecond laser is demonstrated via coherent dispersive wave generation in silicon nitride nanophotonic waveguides.

    • Hairun Guo
    • , Clemens Herkommer
    • , Adrien Billat
    • , Davide Grassani
    • , Chuankun Zhang
    • , Martin H. P. Pfeiffer
    • , Wenle Weng
    • , Camille-Sophie Brès
    •  & Tobias J. Kippenberg
  • Article |

    By sending few-microjoule single-cycle terahertz pulses to a segmented terahertz electron accelerator and manipulator, 70 MV m–1 peak acceleration fields, 2 kT m–1 focusing gradients, 140 µrad fs–1 streaking gradient and bunch compression to 100 fs are achieved.

    • Dongfang Zhang
    • , Arya Fallahi
    • , Michael Hemmer
    • , Xiaojun Wu
    • , Moein Fakhari
    • , Yi Hua
    • , Huseyin Cankaya
    • , Anne-Laure Calendron
    • , Luis E. Zapata
    • , Nicholas H. Matlis
    •  & Franz X. Kärtner
  • Article |

    Biodegradable cellulose-based photonic and plasmonic architectures are fabricated via soft nanoimprinting lithography, and are used for structural colour generation, photoluminescence enhancement and as disposable surface-enhanced Raman scattering substrates.

    • André Espinha
    • , Camilla Dore
    • , Cristiano Matricardi
    • , Maria Isabel Alonso
    • , Alejandro R. Goñi
    •  & Agustín Mihi
  • Article |

    Circularly polarized isolated extreme-ultraviolet pulses are generated by exploiting non-collinear high- harmonic generation driven by two counter-rotating few-cycle laser beams. The numerical simulation predicts a linear chirp of 330 attoseconds.

    • Pei-Chi Huang
    • , Carlos Hernández-García
    • , Jen-Ting Huang
    • , Po-Yao Huang
    • , Chih-Hsuan Lu
    • , Laura Rego
    • , Daniel D. Hickstein
    • , Jennifer L. Ellis
    • , Agnieszka Jaron-Becker
    • , Andreas Becker
    • , Shang-Da Yang
    • , Charles G. Durfee
    • , Luis Plaja
    • , Henry C. Kapteyn
    • , Margaret M. Murnane
    • , A. H. Kung
    •  & Ming-Chang Chen
  • Article |

    Surface treatment is shown to yield passivated perovskite films with very high quasi-Fermi level splitting and internal photoluminescence quantum efficiency, indicating that further improvements in the performance of perovskite optoelectronics should be feasible.

    • Ian L. Braly
    • , Dane W. deQuilettes
    • , Luis M. Pazos-Outón
    • , Sven Burke
    • , Mark E. Ziffer
    • , David S. Ginger
    •  & Hugh W. Hillhouse