Terahertz optics articles within Nature Communications

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  • Article
    | Open Access

    The authors observe THz emission from Ni/Pt heterostructure due to long-range ballistic orbital transport. The velocity of orbital current can be optically tuned by laser fluence, opening the avenue for future optorbitronic devices.

    • Sobhan Subhra Mishra
    • , James Lourembam
    •  & Ranjan Singh

  • Article
    | Open Access

    The authors study the [Nb/V/Ta] superconducting artificial superlattice, known to support a superconducting diode effect, by pulsed THz spectroscopy and simultaneous transport. They found a non-monotonic switching between the superconducting and normal state, which can be explained if the THz-driven vortex depinning determines the critical current.

    • Fumiya Sekiguchi
    • , Hideki Narita
    •  & Yoshihiko Kanemitsu

  • Article
    | Open Access

    Metasurface-based architectures enhance light-matter interactions between a terahertz photonic mode and glucose vibrational resonance. This platform allows new physical and chemical properties of hybrid light-matter states to be exploited.

    • Ahmed Jaber
    • , Michael Reitz
    •  & Jean-Michel Ménard

  • Article
    | Open Access

    Stark spectroscopy of molecules in liquid solutions was once challenging due to orientation effects, solved by freezing but limiting ambient studies. Now, THz Stark spectroscopy with intense terahertz pulses enables dynamic analysis of molecules in both non-polar and polar solvents at any temperature, advancing conventional methods.

    • Bong Joo Kang
    • , Egmont J. Rohwer
    •  & Thomas Feurer

  • Article
    | Open Access

    Photonic time crystal refers to a material whose dielectric properties oscillate in time. Here the authors theoretically show such behaviour in the excitonic insulator candidate Ta2NiSe5 under optical excitation and use it to explain the enhanced THz reflectivity recently observed in pump-probe experiments

    • Marios H. Michael
    • , Sheikh Rubaiat Ul Haque
    •  & Eugene Demler

  • Article
    | Open Access

    S. Gassner et al. propose using light pulses to drive a centrosymmetric s-wave superconductor with strong spin-orbit coupling into a metastable triplet p-wave superconductor with non-trivial topology. The two superconducting orders must be closely competing in equilibrium and the light pulse must break a generalized, dynamic form of inversion symmetry.

    • Steven Gassner
    • , Clara S. Weber
    •  & Martin Claassen

  • Article
    | Open Access

    The charge-density-wave Weyl semimetal (TaSe4)2I is a candidate for an axion insulator, however it may be obscured by polaron physics. Here, using ultrafast terahertz photocurrent spectroscopy, the authors realize phase switches from the polaronic state, to the charge density wave phase, and to the Weyl phase.

    • Bing Cheng
    • , Di Cheng
    •  & Jigang Wang

  • Article
    | Open Access

    Transparent absorbers for electromagnetic interference shielding are sought in the terahertz frequency range. The authors demonstrate organohydrogel-elastomer composites based on permittivity gradients, with strong ionic conduction loss, showing high absorption in the 0.5–4.5 THz band.

    • Wenke Xie
    • , Qian Tang
    •  & Qiye Wen

  • Article
    | Open Access

    Antiferromagnets exhibit high frequency magnons, in the THz regime, a point potentially useful for applications, however, it has meant that detecting spin-fluctuations in antiferromagnets is typically too fast for current experimental approaches. Here Weiss et al use femtosecond noise correlation spectroscopy to observe magnon fluctuations in Sm0.7Er0.3FeO3.

    • M. A. Weiss
    • , A. Herbst
    •  & T. Kurihara

  • Article
    | Open Access

    In this work, the authors use a surface plasmonic mechanism to efficiently confine TeraHertz photons inside ultrasmall cavities. These plasmonic-based TeraHertz cavities are shown to operate until the ultimate limit that is allowed fundamentally and at which plasmons start to behave in a nonlocal fashion.

    • Ian Aupiais
    • , Romain Grasset
    •  & Yannis Laplace

  • Article
    | Open Access

    Terahertz frequencies offer the potential of much higher data transfer rates, but this requires devices able to generate and manipulate terahertz waves. One approach is to utilize the spin dynamics of a magnetic system. Here, Ilyakov et al. show how a multilayer magnetic and heavy-metal heterostructure can be used to achieve terahertz second harmonic generation and optical rectification.

    • Igor Ilyakov
    • , Arne Brataas
    •  & Sergey Kovalev

  • Article
    | Open Access

    The authors develop a method for sub-diffraction near-field imaging using measurements taken relatively far from an object, amplifying evanescent waves that encode the highest resolution. The increased distance greatly reduces the perturbation of the fields by the imaging device itself.

    • Alessandro Tuniz
    •  & Boris T. Kuhlmey

  • Article
    | Open Access

    THz-driven electron emission is predicted to yield a single burst, due to the single-cycle waveform. Here, the authors demonstrate the confinement of single-cycle THz-waveform-driven electron emission to one of the two half cycles and the control of the active half cycle by changing the field polarity.

    • Shaoxian Li
    • , Ashutosh Sharma
    •  & József A. Fülöp

  • Article
    | Open Access

    THz pulses with tuneable properties are desirable for manipulating electronic states in materials. The authors report generation of THz pulses with phase, frequency, and amplitude control by tuning exciton interference in a 1D Mott insulator of transition metal complex and provide insight into exciton dynamics.

    • Tatsuya Miyamoto
    • , Akihiro Kondo
    •  & Hiroshi Okamoto

  • Article
    | Open Access

    Periodic perturbations and guided mode engineering into Brillouin zone folding-induced bound states in the continuum resulted in ultrahigh Q factors that are both robust and sustainable across a broad range of tunable momentum space.

    • Wenhao Wang
    • , Yogesh Kumar Srivastava
    •  & Ranjan Singh

  • Article
    | Open Access

    Antiferromagnets are promising candidates to build terahertz spintronic devices. However, manipulating and detecting their terahertz spin dynamics remains key challenges. Here, Rongione et al. demonstrate both broadband and narrowband terahertz emission from an antiferromagnet/heavy metal heterostructure using spin-phonon interactions.

    • E. Rongione
    • , O. Gueckstock
    •  & R. Lebrun

  • Article
    | Open Access

    The authors demonstrate a single-shot ultrafast terahertz (THz) photography system that can provide both the 2D spatial and 1D temporal imaging capabilities of ultrashort transient scenes with sub-picosecond temporal resolutions by engineering the electro-optic detection system.

    • Junliang Dong
    • , Pei You
    •  & Roberto Morandotti

  • Article
    | Open Access

    Polaron formation is considered to play a crucial role to enhance photoelectric performance of hybrid halide perovskites. Here, the authors report the real-time observation of polaron formation process by terahertz emission spectroscopy and reveal two different polaron modes in FAPbI3 films.

    • Xingyu Yue
    • , Chunwei Wang
    •  & Juan Du

  • Perspective
    | Open Access

    The field of terahertz wireless communication is growing rapidly. Here the authors discuss the challenges for the architectures of wireless platforms above 100 GHz and their potential applications.

    • Josep M. Jornet
    • , Edward W. Knightly
    •  & Daniel M. Mittleman

  • Article
    | Open Access

    The authors present a photonic scheme for terahertz synthesis using an optical frequency comb in stabilization to an ultra-low expansion optical cavity, achieving an unprecedented level of frequency instability of 10−15 at 1-s integration over the tunable range of 0.1–1.1 THz.

    • Dong-Chel Shin
    • , Byung Soo Kim
    •  & Seung-Woo Kim

  • Article
    | Open Access

    THz integrate light sources represent an important building blocks for various applications. Here the authors report an electrically driven topological laser based on photonic Majorana zero mode that can convert electricity directly into THz single-mode laser with topologically nontrivial beams.

    • Song Han
    • , Yunda Chua
    •  & Qi Jie Wang

  • Article
    | Open Access

    By placing an antiferromagnet next to a heavy metal such as platinum, magnetic excitations in the antiferromagnet drive a spin current in the heavy metal, leading to terahertz emission. Here, Kholid et al study the terahertz emission of two antiferromagnets, KCoF3 and KNiF3 with very different magnon frequencies, and find that the opening of a gap in the magnon density of states drastically alters the spin-transfer efficiency.

    • Farhan Nur Kholid
    • , Dominik Hamara
    •  & Chiara Ciccarelli

  • Article
    | Open Access

    THz imaging and spectroscopy always request even more efficient components. Here the authors, thanks to a modified photoconductive switch that includes a graphene layer, demonstrate a high-speed photoconductive switch without sacrificing the generated power.

    • Dehui Zhang
    • , Zhen Xu
    •  & Zhaohui Zhong

  • Article
    | Open Access

    Spintronic terahertz (THz) emitters are a class of magnetic heterostructure where femtosecond laser excitations generate THz radiation emission. While they have great potential, electric field control of spintronic emitter remains a challenge. Here, by combining a spintronic emitter with a piezoelectric substrate, Agarwal et al. demonstrate electric field control of THz emission through induced piezostrain.

    • Piyush Agarwal
    • , Lisen Huang
    •  & Ranjan Singh

  • Article
    | Open Access

    A label-free sensing method has been developed for identifying hazardous pathogens based on their intrinsic properties. This was possible by interrogating the temperature-dependent dielectric constant of the microbes in the far-infrared range.

    • S. W. Jun
    •  & Y. H. Ahn

  • Article
    | Open Access

    There is interest in measuring the vacuum fluctuations of electromagnetic radiation. Here the authors demonstrate quantum-vacuum electric field correlations between two regions which are outside the light-cone.

    • Francesca Fabiana Settembrini
    • , Frieder Lindel
    •  & Jérôme Faist

  • Article
    | Open Access

    As wireless communications move towards terahertz frequencies, previously unidentified jamming vulnerabilities are revealed. Novel features not typically observed at lower frequencies are studied, including high directional attacks, beat jamming and asymmetric bit interference.

    • Rabi Shrestha
    • , Hichem Guerboukha
    •  & Daniel M. Mittleman

  • Article
    | Open Access

    Controlling the electric polarization in ferroelectric materials at room temperature is an important aspect in the design of novel ferroelectric-based devices. Simulations of a typical ferroelectric material now provide insights into why and how its ferroelectric polarization can be partially reversed.

    • Peng Chen
    • , Charles Paillard
    •  & Laurent Bellaiche

  • Article
    | Open Access

    By combining an asymmetric immersion lens setup and a complementary resonating metasurface, the authors are able to resolve the far-field transmission of an ultrastrongly coupled, highly subwavelength split-ring single resonator at millimeter wavelengths.

    • Shima Rajabali
    • , Sergej Markmann
    •  & Giacomo Scalari

  • 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

    The authors demonstrate a far-field approach for height profile measurements with sub-millimetre waves. By evaluating Fabry-Pérot oscillations within surface-structured samples, combined with a Hilbert-transform approach, they visualize structures with a height of 49 nm, with 31 nm precision.

    • Alonso Ingar Romero
    • , Amlan kusum Mukherjee
    •  & Sascha Preu

  • Article
    | Open Access

    Manipulating photon dynamics is becoming increasingly important especially for quantum optics applications. In this work, the authors provide a mechanism that functions as a ‘photon brake’ which relies on the concept of temporal loss boundary to manipulate the dynamics of cavity photons.

    • Longqing Cong
    • , Jiaguang Han
    •  & Ranjan Singh

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