Nonlinear optics articles within Nature

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  • Article
    | Open Access

    Sea-based optical clocks combining a molecular iodine spectrometer, fibre frequency comb and electronics for monitoring and control demonstrate high precision in a smaller volume than active hydrogen masers.

    • Jonathan D. Roslund
    • , Arman Cingöz
    •  & Martin M. Boyd

  • Article
    | Open Access

    We introduce strong tailored light-wave-driven time-reversal symmetry breaking in monolayer hexagonal boron nitride, realizing a sub-laser-cycle controllable analogue of the topological model of Haldane and inducing non-resonant valley polarization.

    • Sambit Mitra
    • , Álvaro Jiménez-Galán
    •  & Shubhadeep Biswas

  • Article |

    An integrated device that combines optical parametric oscillation and electro-optic modulation in lithium niobate creates a flat-top frequency-comb-like output with low power requirements.

    • Hubert S. Stokowski
    • , Devin J. Dean
    •  & Amir H. Safavi-Naeini

  • Article |

    Free-running stable optical dissipative solitons, called Nozaki–Bekki solitons, are created in a ring semiconductor laser; their spontaneous formation with tuning of laser bias eliminates the need for an external optical pump.

    • Nikola Opačak
    • , Dmitry Kazakov
    •  & Benedikt Schwarz

  • Article
    | Open Access

    The Berry phase is resolved in light-driven crystals, via attosecond interferometry, in which the electronic wavefunction accumulates a geometric phase as it interacts with the laser field, mapping its coherence into the emission of high-order harmonics.

    • Ayelet J. Uzan-Narovlansky
    • , Lior Faeyrman
    •  & Nirit Dudovich

  • Article |

    A van der Waals crystal, niobium oxide dichloride, with vanishing interlayer electronic coupling and considerable monolayer-like excitonic behaviour in the bulk, as well as strong and scalable second-order optical nonlinearity, is discovered, which enables a high-performance quantum light source.

    • Qiangbing Guo
    • , Xiao-Zhuo Qi
    •  & Andrew T. S. Wee

  • Article |

    By using Si3N4 photonic integrated circuits on a silicon chip, a continuous-travelling-wave parametric amplifier is shown to yield a parametric gain exceeding both on-chip propagation loss as well as fibre–chip–fibre coupling losses.

    • Johann Riemensberger
    • , Nikolai Kuznetsov
    •  & Tobias J. Kippenberg

  • Article
    | Open Access

    A hybrid algorithm that applies backpropagation is used to train layers of controllable physical systems to carry out calculations like deep neural networks, but accounting for real-world noise and imperfections.

    • Logan G. Wright
    • , Tatsuhiro Onodera
    •  & Peter L. McMahon

  • Article |

    Stable, dissipative optomechanical solitons are realized using optical fields in a whispering gallery mode resonator by balancing the optomechanical nonlinearities with a tailored modal dispersion.

    • Jing Zhang
    • , Bo Peng
    •  & Lan Yang

  • Article |

    Engineering of the coupling between optical modes in a lithium niobate chip enables the realization of tunable, bi-directional and low-loss electro-optic frequency shifters controlled using only continuous and single-tone microwaves.

    • Yaowen Hu
    • , Mengjie Yu
    •  & Marko Lončar

  • Article |

    Nonlinearity is shown to induce quantized topological transport via soliton motion; specifically, we demonstrate nonlinear Thouless pumping of photons in waveguide arrays with a non-uniformly occupied energy band.

    • Marius Jürgensen
    • , Sebabrata Mukherjee
    •  & Mikael C. Rechtsman

  • Article |

    precisely controllable integrated optical gyroscope based on stimulated Brillouin scattering is used to study non-Hermitian physics, revealing a four-fold enhancement of the Sagnac scale factor near exceptional points.

    • Yu-Hung Lai
    • , Yu-Kun Lu
    •  & Kerry Vahala

  • Letter |

    Nonlinear optical measurements in a two-dimensional electron system embedded in an optical cavity show enhanced polariton–polariton interactions in the fractional quantum Hall regime.

    • Patrick Knüppel
    • , Sylvain Ravets
    •  & Atac Imamoglu

  • Letter |

    A low-power, fixed microwave signal in combination with an optical-pump signal generates an optical frequency comb that spans the whole wavelength range of the telecommunications C-band, with possible applications ranging from spectroscopy to optical communications.

    • Alfredo Rueda
    • , Florian Sedlmeir
    •  & Harald G. L. Schwefel

  • Letter |

    Electro-optic detection in a nonlinear crystal is used to measure coherence properties of vacuum fluctuations of the electromagnetic field and deduce the spectrum of the ground state of electromagnetic radiation.

    • Ileana-Cristina Benea-Chelmus
    • , Francesca Fabiana Settembrini
    •  & Jérôme Faist

  • Letter |

    Terahertz light pulses induce transitions between a topological and a trivial phase in the Weyl semimetal WTe2 through an interlayer shear strain.

    • Edbert J. Sie
    • , Clara M. Nyby
    •  & Aaron M. Lindenberg

  • Letter |

    Integrating an optical Kerr frequency comb source with an electronically excited laser pump produces a battery-powered comb generator that does not require external lasers, moveable optics or laboratory set-ups.

    • Brian Stern
    • , Xingchen Ji
    •  & Michal Lipson

  • Letter |

    The magnetization or polarization of domain states in multiferroics can be reversed while retaining the overall domain pattern, owing to the inherent versatility in coupling the large number of multiferroic order parameters.

    • N. Leo
    • , V. Carolus
    •  & M. Fiebig

  • Letter |

    An optical-frequency synthesizer based on stabilized frequency combs has been developed utilizing chip-scale devices as key components, in a move towards using integrated photonics technology for ultrafast science and metrology.

    • Daryl T. Spencer
    • , Tara Drake
    •  & Scott B. Papp

  • Letter |

    High-harmonic generation in zinc oxide illuminated by an intense, pulsed, mid-infrared laser is found to involve a recollision effect in which electrons recollide with holes causing harmonics to be emitted, a process similar to that which occurs in atomic systems.

    • G. Vampa
    • , T. J. Hammond
    •  & P. B. Corkum

  • Letter |

    A series of long-lived excitons in a monolayer of tungsten disulphide are found to have strong binding energy and an energy dependence on orbital momentum that significantly deviates from conventional, three-dimensional, behaviour.

    • Ziliang Ye
    • , Ting Cao
    •  & Xiang Zhang

  • Letter |

    Multiple-quantum-well semiconductors can provide one of the largest known nonlinear material responses, which is, however, geometrically limited to light beams polarized perpendicular to the semiconductor layers; by coupling a plasmonic metasurface to the semiconductor heterostructure, this limitation can be lifted, opening a new path towards ultrathin planarized components with large nonlinear response.

    • Jongwon Lee
    • , Mykhailo Tymchenko
    •  & Mikhail A. Belkin

  • Letter |

    Quantum gates — in which stationary quantum bits are combined with ‘flying’ quantum bits, that is, photons — will be essential in quantum networks; such a gate, between a laser-trapped atomic quantum bit and a single photon, is now reported.

    • Andreas Reiserer
    • , Norbert Kalb
    •  & Stephan Ritter

  • Letter |

    By coupling light to strongly interacting atomic Rydberg states in a dispersive regime, it is possible to induce individual photons to travel as massive particles with strong mutual attraction, such that the propagation of photon pairs is dominated by a two-photon bound state.

    • Ofer Firstenberg
    • , Thibault Peyronel
    •  & Vladan Vuletić

  • Letter |

    A continuous-wave Raman silicon laser with a photonic-crystal nanocavity less than ten micrometres in size and an unprecedentedly low lasing threshold of one microwatt is demonstrated, showing that the integration of all-silicon devices into photonic circuits may be possible.

    • Yasushi Takahashi
    • , Yoshitaka Inui
    •  & Susumu Noda

  • News & Views |

    A special type of optical amplifier based on a vapour of rubidium has been demonstrated that makes faint images brighter without adding noise. This concept could find use in biological imaging and image processing.

    • Stéphane Clemmen
    •  & Alexander Gaeta

  • News & Views |

    Use of an ultra-high-intensity X-ray laser has allowed X-ray and optical waves to be mixed in a diamond sample. The effect paves the way to studying the microscopic optical response of materials on an atomic scale. See Article p.603

    • Nina Rohringer

  • Letter |

    The effect of quantum radiation-pressure fluctuations on the collective motion of ultracold atoms is observed in a cavity-optomechanical system, and the back-action of this motion on the cavity light field is shown to produce sub-shot-noise optical squeezing.

    • Daniel W. C. Brooks
    • , Thierry Botter
    •  & Dan M. Stamper-Kurn

  • Letter |

    Non-classical states of light, such as entangled photon states, form an essential quantum resource. Entangled photon pairs can be created by spontaneous parametric down-conversion of laser light, but so far it has not been possible to produce photon triplets in this way. These authors report the generation of quantum-correlated photon triplets by cascaded down-conversion of a single pump photon. This should find widespread use in optical quantum technologies.

    • Hannes Hübel
    • , Deny R. Hamel
    •  & Thomas Jennewein

  • News & Views |

    A subtle quantum-interference effect has been used to control the optical response of a single atom confined in a cavity. It could offer a means to develop logic gates for an optical quantum computer.

    • Scott Parkins

  • News & Views |

    The chaotic motion of light rays gives microlasers surprising emission properties, enhancing quantum tunnelling by many orders of magnitude and producing highly directional output beams.

    • A. Douglas Stone

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