Volume 12 Issue 8, August 2018

Volume 12 Issue 8

Single-cycle tunable source

Artistic impression of a tailored plasma structure that frequency downshifts a near-infrared laser pulse to efficiently generate intense, single-cycle infrared pulses in the spectral range of 5–14 μm. Such long-wavelength single-cycle pulses are potentially useful for many applications including coherent control, metrology and attosecond generation.

See Lu et al.

Image: Zan Nie and Yue Ma, Tsinghua University. Cover Design: Bethany Vukomanovic.

Editorial

  • Editorial |

    The race to develop self-driving cars means that optical LiDAR is forecast to become a US$5 billion market within 5 years. Photonics start-ups in the area are finding themselves at the centre of a frenzy of acquisition and investment.

Books & Arts

Research Highlights

News & Views

  • News & Views |

    Spin-dependent lateral optical forces, 100,000 times larger than those reported so far, can lead to displacements of centimetre-sized objects observable by the naked eye.

    • Jorge Olmos-Trigo
    •  & Juan José Sáenz
  • News & Views |

    The generation of hot electrons in plasmonic nanostructures is of scientific and technological interest, putting the community under pressure to better understand the hot-electron mechanisms and to increase the light conversion efficiency of plasmonic nanosystems for chemical reactions and photodetection.

    • Rachel Won
  • News & Views |

    A chip-based optical frequency comb source has now been successfully used to send 661 Tbit s–1 over 9.6 km of multicore fibre, bringing considerable savings in the energy consumption and size of data transmission equipment.

    • Daniel J. Blumenthal

Review Articles

  • Review Article |

    Valleytronics in single-layer semiconductors is reviewed with an emphasis on controlling the valley degree of freedom with light as well as potential applications.

    • Kin Fai Mak
    • , Di Xiao
    •  & Jie Shan

Letters

  • Letter |

    Near-infrared femtosecond laser pulses are sent to a Si or ZnO crystal to generate high-harmonic waves via static or transient field-induced optical nonlinearities. The beam profile of the high-harmonic emission is controlled by electronic methods.

    • G. Vampa
    • , T. J. Hammond
    • , M. Taucer
    • , Xiaoyan Ding
    • , X. Ropagnol
    • , T. Ozaki
    • , S. Delprat
    • , M. Chaker
    • , N. Thiré
    • , B. E. Schmidt
    • , F. Légaré
    • , D. D. Klug
    • , A. Yu. Naumov
    • , D. M. Villeneuve
    • , A. Staudte
    •  & P. B. Corkum
  • Letter |

    By seeding a non-resonant aluminium-gallium-arsenide-on-insulator nanowaveguide with 10-GHz picosecond pulses at a low pump power of 85 mW, a single energy-efficient frequency comb source carrying 661 Tbit s–1 of data, equivalent to more than the total Internet traffic today, is achieved.

    • Hao Hu
    • , Francesco Da Ros
    • , Minhao Pu
    • , Feihong Ye
    • , Kasper Ingerslev
    • , Edson Porto da Silva
    • , Md. Nooruzzaman
    • , Yoshimichi Amma
    • , Yusuke Sasaki
    • , Takayuki Mizuno
    • , Yutaka Miyamoto
    • , Luisa Ottaviano
    • , Elizaveta Semenova
    • , Pengyu Guan
    • , Darko Zibar
    • , Michael Galili
    • , Kresten Yvind
    • , Toshio Morioka
    •  & Leif K. Oxenløwe
  • Letter |

    A nonlinear charge oscillation driven by a 6 fs light field of 11 MV cm–1 is observed in a layered organic superconductor. The initial response time of the oscillation on the timescale of 10 fs clarifies that Coulomb repulsion is essential for the superconductivity.

    • Y. Kawakami
    • , T. Amano
    • , Y. Yoneyama
    • , Y. Akamine
    • , H. Itoh
    • , G. Kawaguchi
    • , H. M. Yamamoto
    • , H. Kishida
    • , K. Itoh
    • , T. Sasaki
    • , S. Ishihara
    • , Y. Tanaka
    • , K. Yonemitsu
    •  & S. Iwai
  • Letter |

    Linewidth broadening of a phonon laser operated at an exceptional point of a compound optomechanical system is experimentally demonstrated.

    • Jing Zhang
    • , Bo Peng
    • , Şahin Kaya Özdemir
    • , Kevin Pichler
    • , Dmitry O. Krimer
    • , Guangming Zhao
    • , Franco Nori
    • , Yu-xi Liu
    • , Stefan Rotter
    •  & Lan Yang
  • Letter |

    Nanocrystals assembled into metal–insulator–metal junctions can boost the efficiency of light generation from enhanced inelastic tunnelling to ~2%, which is a two orders of magnitude improvement over previous work, paving the way to on-chip ultrafast and ultracompact light sources.

    • Haoliang Qian
    • , Su-Wen Hsu
    • , Kargal Gurunatha
    • , Conor T. Riley
    • , Jie Zhao
    • , Dylan Lu
    • , Andrea R. Tao
    •  & Zhaowei Liu

Articles

  • Article |

    A scheme for generating intense single-cycle pulses in the 5–14 μm wavelength range is proposed. The generation mechanism is described by photon frequency downshifting of an off-the-shelf Ti:sapphire laser in a tailored plasma density structure.

    • Zan Nie
    • , Chih-Hao Pai
    • , Jianfei Hua
    • , Chaojie Zhang
    • , Yipeng Wu
    • , Yang Wan
    • , Fei Li
    • , Jie Zhang
    • , Zhi Cheng
    • , Qianqian Su
    • , Shuang Liu
    • , Yue Ma
    • , Xiaonan Ning
    • , Yunxiao He
    • , Wei Lu
    • , Hsu-Hsin Chu
    • , Jyhpyng Wang
    • , Warren B. Mori
    •  & Chan Joshi

Amendments & Corrections

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