Volume 12 Issue 10, October 2018

Volume 12 Issue 10

Nonlinear crystals go 3D

A 3D nonlinear photonic crystal in lithium niobate is realized by using a laser erasing technique to spatially control the crystal’s nonlinearity, locally switching it ‘on’ or ‘off’. The achievement provides a promising platform to fully control nonlinearity and interacting waves for applications in beam shaping, holography and quantum information processing.

See Zhang et al. and Ellenbogen.

Image: Dunzhao Wei, Yong Zhang, Nanjing University; Chaowei Wang, Dong Wu, University of Science and Technology of China. Cover Design: Bethany Vukomanovic.

Books & Arts

Research Highlights

News & Views

  • News & Views |

    An acoustic wave can induce non-reciprocal light modulation in a silicon waveguide. Now, the acoustic wave has been induced optically in a neighbouring silicon waveguide, opening the way for a silicon-based optical isolator.

    • Alexander Yu. Petrov
  • News & Views |

    Artificial intelligence looks poised to drive the development of software and hardware platforms in the coming decades. In photonics, it is already proving invaluable and is having an impact in the areas of imaging, sensing and communications.

    • Rachel Won
  • News & Views |

    The achievement of plasmonic-enhanced silicon-based terahertz emitters and detectors brings hope for the realization of integrated circuits that bring together electronics, photonics and terahertz functions on a single chip.

    • Guillaume Ducournau
  • News & Views |

    The first three-dimensional nonlinear photonic crystals have been constructed thanks to the use of femtosecond laser writing in quadratic nonlinear materials.

    • Shay Keren-Zur
    •  & Tal Ellenbogen

Review Articles

  • Review Article |

    Over the past 10–15 years, quantitative phase imaging has moved from a research-driven to an application-focused field. This Review presents the main principles of operation and representative basic and clinical science applications.

    • YongKeun Park
    • , Christian Depeursinge
    •  & Gabriel Popescu

Letters

  • Letter |

    A three-dimensional nonlinear photonic crystal in ferroelectric barium calcium titanate that enables phase matching of nonlinear processes along an arbitrary direction, thereby removing constraints imposed by low-dimensional structures, is experimentally realized.

    • Tianxiang Xu
    • , Krzysztof Switkowski
    • , Xin Chen
    • , Shan Liu
    • , Kaloian Koynov
    • , Haohai Yu
    • , Huaijin Zhang
    • , Jiyang Wang
    • , Yan Sheng
    •  & Wieslaw Krolikowski
  • Letter |

    By selectively erasing the nonlinear coefficients in a lithium niobate crystal using a femtosecond laser, a 3D nonlinear photonic crystal, with an effective conversion efficiency comparable to that of the typical quasi-phase-matching processes, is demonstrated.

    • Dunzhao Wei
    • , Chaowei Wang
    • , Huijun Wang
    • , Xiaopeng Hu
    • , Dan Wei
    • , Xinyuan Fang
    • , Yong Zhang
    • , Dong Wu
    • , Yanlei Hu
    • , Jiawen Li
    • , Shining Zhu
    •  & Min Xiao

Articles

  • Article |

    Black phosphorus/molybdenum disulfide mid-wave infrared photodiodes with external quantum efficiencies of 35% across 2.5–3.5 μm at room temperature and a peak detectivity of 1.1 × 1010 cm Hz1/2 W–1 at 3.8 μm are demonstrated.

    • James Bullock
    • , Matin Amani
    • , Joy Cho
    • , Yu-Ze Chen
    • , Geun Ho Ahn
    • , Valerio Adinolfi
    • , Vivek Raj Shrestha
    • , Yang Gao
    • , Kenneth B. Crozier
    • , Yu-Lun Chueh
    •  & Ali Javey
  • Article |

    Non-reciprocal single-sideband modulation and mode conversion are realized in a low-loss integrated silicon waveguide, enabling >125 GHz operation bandwidths and up to 38 dB of non-reciprocal contrast between forward- and backward-propagating waves.

    • Eric A. Kittlaus
    • , Nils T. Otterstrom
    • , Prashanta Kharel
    • , Shai Gertler
    •  & Peter T. Rakich
  • Article |

    Coherent extreme-ultraviolet emission through frustrated tunnelling ionization is observed from He atoms excited by intense few-cycle infrared laser pulses. Its intensity depends on the ellipticity and the carrier-envelope phase of the infrared laser.

    • Hyeok Yun
    • , Je Hoi Mun
    • , Sung In Hwang
    • , Seung Beom Park
    • , Igor A. Ivanov
    • , Chang Hee Nam
    •  & Kyung Taec Kim

Amendments & Corrections