High-harmonic generation articles within Nature Communications

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  • Article
    | Open Access

    The advent of isolated attosecond XUV pulse sources marks a new era in attosecond science, pivotal for the investigation of core electron dynamics. Here the authors discover that the coherent Raman coupling between the cation states leads to extra timedelay between different transition channels by applying the attosecond transient absorption spectroscopy on the investigation of complex dynamics of strong field ionization of Krypton.

    • Li Wang
    • , Guangru Bai
    •  & Zengxiu Zhao

  • Article
    | Open Access

    Here the authors identify real-space contributions to the characteristics of high-harmonic generation in ReS2 and demonstrate the possibility of laser-controlled emission. They find that the spectrum is not just determined by the band structure, but also by the interference between HHG signals coming from different atoms within the unit cell.

    • Álvaro Jiménez-Galán
    • , Chandler Bossaer
    •  & Giulio Vampa

  • Article
    | Open Access

    High-harmonic generation (HHG) is a nonlinear process and has been explored with different forms of plasma target. Here the authors report HHG using a liquid plasma mirror as a possible way for the generation of stable and intense attosecond pulses at a high-repetition rate.

    • Yang Hwan Kim
    • , Hyeon Kim
    •  & Kyung Taec Kim

  • Article
    | Open Access

    There are many possible mechanisms of high-harmonic generation from crystals. Here the authors discuss the role of the Bloch oscillation to nonlinear response of the crystal and harmonic radiation from it.

    • Jan Reislöhner
    • , Doyeong Kim
    •  & Adrian N. Pfeiffer

  • Article
    | Open Access

    Under strong laser fields, materials exhibit extreme non-linear optical response, such as high harmonic generation. These higher harmonics provide insights into electron behaviour in materials in sub-laser cycle timescale. Here, Cha et al study higher harmonic generation resulting from the laser driven motion of massless Dirac fermions in graphene.

    • Soonyoung Cha
    • , Minjeong Kim
    •  & Jonghwan Kim

  • Article
    | Open Access

    The authors introduce the concept of real-synthetic symmetries and use it as a tool to derive selection rules in seemingly symmetry-broken strong-field interactions. These symmetries and their corresponding selection rules can be applied in various systems form harmonic generation to topological photonics

    • Matan Even Tzur
    • , Ofer Neufeld
    •  & Oren Cohen

  • Article
    | Open Access

    A continuum spanning from 300 and 3000 nm is used to synthesize a single-cycle field transient and measure its waveform through electro-optic sampling, speeding up this sensitive technique so that it can access the electric field of visible light.

    • Enrico Ridente
    • , Mikhail Mamaikin
    •  & Nicholas Karpowicz

  • Article
    | Open Access

    Attosecond pulse generation needs improvements both in terms of tunability and photon flux for next level attosecond experiments. Here the authors show how to control the HHG emission and its spectral-temporal characteristics by driving the IAP generation with synthesized sub-cycle optical pulses.

    • Yudong Yang
    • , Roland E. Mainz
    •  & Franz X. Kärtner

  • Article
    | Open Access

    Weyl semimetals have interesting band-structure features that lead to unique properties. Here, the authors observe and study high-harmonic generation in type-II Weyl semimetal β-WP2 crystals.

    • Yang-Yang Lv
    • , Jinlong Xu
    •  & Shining Zhu

  • Article
    | Open Access

    Light induced magnetization dynamics can be as fast as few tens of femtoseconds. Here, Zayko et al show ultrafast microscopy based on high-harmonic radiation for direct imaging of ultrafast phenomena and capture femtosecond spin dynamics at the nanoscale.

    • Sergey Zayko
    • , Ofer Kfir
    •  & Claus Ropers

  • Article
    | Open Access

    High harmonic generation is a nonlinear optical phenomena and HHG from solid offers challenges and advantages over dilute media like gases. Here the authors report HHG from metallic thin film of titanium nitride and discuss the role of intraband current to HHG.

    • A. Korobenko
    • , S. Saha
    •  & P. B. Corkum

  • Article
    | Open Access

    Strong nonlinearities, like high harmonic generation in optical systems, can lead to interesting applications in photonics. Here the authors fabricate a thin resonant gallium phosphide metasurface capable of avoiding the laser-induced damage and demonstrate efficient even and odd high harmonic generation from it when driven by mid-infrared laser pulses.

    • Maxim R. Shcherbakov
    • , Haizhong Zhang
    •  & Gennady Shvets

  • Article
    | Open Access

    Developing new methods for structuring light’s chirality in space would be advantageous for various next-generation applications. Here, the authors report enantio-sensitive unidirectional light bending by interacting light with isotropic chiral media.

    • David Ayuso
    • , Andres F. Ordonez
    •  & Olga Smirnova

  • Article
    | Open Access

    Accessing intraband dynamics is challenging due to simultaneous requirements on energy, momentum and time resolution. Here, the authors measure intraband delays between sp- and d-band electronic states in the valence band photoemission from W(110) using intracavity generated attosecond pulse trains.

    • S. Heinrich
    • , T. Saule
    •  & U. Kleineberg

  • Article
    | Open Access

    Here the authors report experiment and theory study of the photoionization of xenon inner shell 4d electron using attosecond pulses. They have identified two ionization paths - one corresponding to broad giant dipole resonance with short decay time and the other involving spin-flip transitions.

    • Shiyang Zhong
    • , Jimmy Vinbladh
    •  & Anne L’Huillier

  • Article
    | Open Access

    Conventional models of high harmonic generation typically do not provide a full quantum description of all phenomena. Here, the authors develop a fully quantum theory for high harmonic generation and use it to study the emission from a quantum system in a strong field.

    • Alexey Gorlach
    • , Ofer Neufeld
    •  & Ido Kaminer

  • Article
    | Open Access

    Here the authors show second harmonic generation (SHG) from a centrosymmetric organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br. They find unusual temperature dependence and CEP-sensitive nature of the SHG which are explained in terms of nonlinear current.

    • Y. Kawakami
    • , T. Amano
    •  & S. Iwai

  • Article
    | Open Access

    High harmonic generation from solids is an interesting and growing field of research. Here the authors explore HHG from GaSe sample driven by two-color fields and find that controlling electron trajectories in a band structure enable to modify the angular and polarization selection rules of HHG.

    • Yasuyuki Sanari
    • , Tomohito Otobe
    •  & Hideki Hirori

  • Perspective
    | Open Access

    Different methods are demonstrated in recent years to produce attosecond pulses. Here, the authors discuss recent development and future prospects of the generation of such pulses from gases and solids and their potential applications in spectroscopy and ultrafast dynamics in atoms, molecules and other complex systems.

    • Jie Li
    • , Jian Lu
    •  & Zenghu Chang

  • Article
    | Open Access

    Interaction between Cooper pairs and other collective excitations may reveal important information about the pairing mechanism. Here, the authors observe a universal jump in the phase of the driven Higgs oscillations in cuprate thin films, indicating the presence of a coupled collective mode, as well as a nonvanishing Higgs-like response at high temperatures, suggesting a potential nonzero pairing amplitude above Tc.

    • Hao Chu
    • , Min-Jae Kim
    •  & Stefan Kaiser

  • Article
    | Open Access

    Vortices in light fields are of growing importance in the XUV and X-ray ranges. Here the authors show by simulations that high harmonics and attosecond pulses, generated while irradiating a deformed thin foil with circularly-polarized Gaussian laser pulses, carry a well-defined orbital angular momentum.

    • J. W. Wang
    • , M. Zepf
    •  & S. G. Rykovanov

  • Article
    | Open Access

    Monolayer materials have tunable electronic structures that may be useful for optical applications. Here the authors show even and odd high-harmonic generation up to 15th order from a variety of monolayers with different band properties and emphasize the role of nonlinear interband polarization.

    • Naotaka Yoshikawa
    • , Kohei Nagai
    •  & Koichiro Tanaka

  • Article
    | Open Access

    Microtubules (MTs) are well-studied cytoskeleton components, but have primarily been investigated using fixation or invasive techniques. Here, the authors use label-free second harmonic (SH) fluorescence and correlative light electron microscopy to pinpoint determinants required for SH from MTs.

    • V. Van Steenbergen
    • , W. Boesmans
    •  & P. Vanden Berghe

  • Article
    | Open Access

    Characterizing higher order nonlinearities and responses to optical excitations in materials is challenging. Here, the authors use high harmonic generation in sapphire crystals to extract higher order susceptibilities and characterize the nonlinear electronic response directly from experimental measurements.

    • Seunghwoi Han
    • , Lisa Ortmann
    •  & Alexandra S. Landsman

  • Article
    | Open Access

    Ultrafast pulses with controlled parameters are desirable in many applications including probing materials and their interaction with light. Here the authors demonstrate a technique for polarization control of XUV beam using high-harmonic generation and polarization shaping.

    • F. Kong
    • , C. Zhang
    •  & P. B. Corkum

  • Article
    | Open Access

    High-harmonic generation in solids is related to the carrier dynamics and can be used to probe dynamic processes. Here, Klemke et al. show that the polarization states of high harmonics generated from silicon and quartz are determined by the crystal symmetries but can also be dynamically controlled.

    • N. Klemke
    • , N. Tancogne-Dejean
    •  & O. D. Mücke

  • Article
    | Open Access

    Space charge effects can distort the results of photoelectron spectroscopic measurements, and usually limit the allowable photon flux in an experiment. Here, the authors present an 18.4 MHz repetition rate high harmonic source in the 25–60 eV range, with a large count rate improvement over state-of-the-art attosecond setups under identical space charge conditions.

    • T. Saule
    • , S. Heinrich
    •  & I. Pupeza

  • Article
    | Open Access

    It is commonly assumed that a complete theory for selection rules in optical nonlinear harmonic generation was developed previously. Here, the authors present more general group theory based formalism for harmonic generation from dilute and dense media, yielding new symmetries and selection rules.

    • Ofer Neufeld
    • , Daniel Podolsky
    •  & Oren Cohen

  • Article
    | Open Access

    Polarization parameters of the high harmonics driven by bichromatic circularly polarized pulses are usually assumed near perfect. Here the authors use polarimetry measurement to show that depolarization and ellipticity can arise from symmetry breaking in the ionization of a medium by the ultrashort driving fields.

    • Lou Barreau
    • , Kévin Veyrinas
    •  & Pascal Salières

  • Article
    | Open Access

    While high–harmonic generation from gases, and more recently also from solids, has been extensively studied, there is little data on HHG from liquids. Here, Luu et al. experimentally demonstrate and study HHG up to 27th order from the bulk of liquid water and different alcohols.

    • Tran Trung Luu
    • , Zhong Yin
    •  & Hans Jakob Wörner

  • Article
    | Open Access

    High-order harmonic generation (HHG) has been explored in different kinds of solids except magnetic materials. Here the authors theoretically predict that the HHG in ferromagnetic Fe thin films is sensitive to the spin–orbit coupling and carries band structure information.

    • G. P. Zhang
    • , M. S. Si
    •  & Thomas F. George

  • Article
    | Open Access

    Ionization time delays are of interest in understanding the photoionization mechanism in atoms and molecules in ultra-short time scales. Here the authors investigate the angular dependence of photoionization time delays in the presence of an autoionizing resonance in argon atom using RABBITT technique.

    • Claudio Cirelli
    • , Carlos Marante
    •  & Ursula Keller

  • Article
    | Open Access

    Photoionization of atoms and molecules is a complex process and requires sensitive probes to explore the ultrafast dynamics. Here the authors combine transient absorption and photo-ion spectroscopy methods to explore and control the attosecond pulse initiated excitation, ionization and Auger decay in Kr atoms.

    • Konrad Hütten
    • , Michael Mittermair
    •  & Birgitta Bernhardt

  • Article
    | Open Access

    The mechanisms of high-order harmonic generation in bulk system and dilute gas are different. Here the authors use first-principle methods to explore the ellipticity dependence and control of the HHG in periodic solids by involving the interband and intraband dynamics in Si and MgO.

    • Nicolas Tancogne-Dejean
    • , Oliver D. Mücke
    •  & Angel Rubio

  • Article
    | Open Access

    Although higher harmonic generation from solids has become of interest in many fields, its observation is typically limited to crystalline solids. Here, the authors demonstrate that higher harmonics can be generated from amorphous solids.

    • Yong Sing You
    • , Yanchun Yin
    •  & Shambhu Ghimire

  • Article
    | Open Access

    Isolated attosecond pulses are produced using high harmonic generation and sources of these pulses often suffer from low photon flux in soft X-ray regime. Here the authors demonstrate efficient generation and characterization of 53 as pulses with photon energy near the water window.

    • Jie Li
    • , Xiaoming Ren
    •  & Zenghu Chang

  • Article
    | Open Access

    High-energy photons in XUV range and attosecond pulses are generated from infrared laser pulses through high harmonic generation in gases and solids. Here, the authors demonstrate the microscopic origin of resonant harmonic generation involving the autoionizing states of Sn in plasma plumes.

    • M. A. Fareed
    • , V. V. Strelkov
    •  & T. Ozaki

  • Article
    | Open Access

    Understanding excited carrier dynamics in semiconductors is central to the continued development of optoelectronic devices. Using extreme ultraviolet transient absorption spectroscopy, Zürchet al. directly and simultaneously observe ultrafast electron and hole dynamics in germanium thin films.

    • Michael Zürch
    • , Hung-Tzu Chang
    •  & Stephen R. Leone

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