Selective THz control of magnetic order: new opportunities from superradiant undulator sources

Kovalev, Sergey; Wang, Zhe; Deinert, Jan‐Christoph; Awari, Nilesh; Chen, Min; Green, Bertram; Germanskiy, Semyon; Oliveira, Thales V. A. G. de; Lee, J. S.; Deac, A.; Turchinovich, Dmitry; Stojanović, Nikola; Eisebitt, Stefan; Radu, Ilie; Bonetti, Stefano; Kampfrath, Tobias; Gensch, Michael

doi:10.1088/1361-6463/aaac75

Cited by 35 publications

(26 citation statements)

References 31 publications

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“…In addition, the experimental detection of the nonlinear response of the NiO spin system as a weak signal (about 1% of the maximum amplitude) in the spectrum of magnon oscillations at the double frequency of the main antiferromagnetic resonant mode (∼1 THz), when the sample was excited at room temperature by broadband and narrowband THz pulses tuned to the frequency of the resonant mode, was reported in the works [28,29], respectively.…”

Section: Excitation Of Spin Subsystem Oscillations Of An Antiferromagmentioning

confidence: 99%

“…The magnetic field of the THz pulse was applied parallel to the (111) surface of the NiO sample and had direct access to the degrees of freedom of the spin system of the antiferromagnetic. In this case, a Zeeman torque is created on the magnetic dipole associated with each spin at a frequency that can be tuned in resonance with the collective mode of the NiO magnons [27][28][29][30].…”

Section: Excitation Of Spin Subsystem Oscillations Of An Antiferromagmentioning

confidence: 99%

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Broadband and narrowband laser-based terahertz source and its application for resonant and non-resonant excitation of antiferromagnetic modes in NiO

et al. 2019

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A versatile table-top high-intense source of terahertz radiation, enabling to generate pulses of both broadband and narrowband spectra with a tunable frequency up to 3 THz is presented. The terahertz radiation pulses are generated by optical rectification of femtosecond pulses of Cr:forsterite laser setup in nonlinear organic crystal OH1. Electric field strengths of broadband and narrowband terahertz pulses were achieved close to 20 MV/cm and more than 2 MV/cm, correspondingly. Experiments on excitation of spin subsystem oscillations of an antiferromagnetic NiO were carried out. Selective excitation of 0.42 THz mode was observed for the first time at room temperature by a narrowband terahertz pulses tuned close to mode frequency.

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Section: Excitation Of Spin Subsystem Oscillations Of An Antiferromagmentioning

confidence: 99%

Section: Excitation Of Spin Subsystem Oscillations Of An Antiferromagmentioning

confidence: 99%

Broadband and narrowband laser-based terahertz source and its application for resonant and non-resonant excitation of antiferromagnetic modes in NiO

et al. 2019

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“…The first exploits current effects, i.e., the fact that a time-varying charge current can act as a radiation source [27]. This basic concept holds for antennas [28][29][30][31][32][33], which are widely used in conjunction with non-amplified pulsed lasers to perform terahertz time-domain spectroscopy, and for particle accelerators, where relativistic electron beams are deflected by magnets and thereby emit radiation of tunable wavelength [34][35][36] that can cover the THz range [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. While accelerators can cover a large frequency range, these complex machines are often optimized for a certain range because optical elements have limited bandwidths [53].…”

Section: Introductionmentioning

confidence: 99%

Towards Intense THz Spectroscopy on Water: Characterization of Optical Rectification by GaP, OH1, and DSTMS at OPA Wavelengths

2020

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Water is the most prominent solvent. The unique properties of water are rooted in the dynamical hydrogen-bonded network. While TeraHertz (THz) radiation can probe directly the collective molecular network, several open issues remain about the interpretation of these highly anharmonic, coupled bands. In order to address this problem, we need intense THz radiation able to drive the liquid into the nonlinear response regime. Firstly, in this study, we summarize the available brilliant THz sources and compare their emission properties. Secondly, we characterize the THz emission by Gallium Phosphide (GaP), 2–{3–(4–hydroxystyryl)–5,5–dimethylcyclohex–2–enylidene}malononitrile (OH1), and 4–N,N–dimethylamino–4′–N′–methyl–stilbazolium 2,4,6–trimethylbenzenesulfonate (DSTMS) crystals pumped by an amplified near-infrared (NIR) laser with tunable wavelength. We found that both OH1 as well as DSTMS could convert NIR laser radiation between 1200 and 2500 nm into THz radiation with high efficiency (> 2 × 10−4), resulting in THz peak fields exceeding 0.1 MV/cm for modest pump excitation (~ mJ/cm2). DSTMS emits the broadest spectrum, covering the entire bandwidth of our detector from ca. 0.5 to ~7 THz, also at a laser wavelength of 2100 nm. Future improvements will require handling the photothermal damage of these delicate organic crystals, and increasing the THz frequency.

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“…However, with the advancements in the schemes of producing THz sources and its indispensable futuristic roles in understanding plethora of physical, chemical and biological processes, the THz Gap is firming its position as bridge between the fundamental sciences e.g. non-linear optics [2][3][4], condensed matter physics [5,6], non-linear spectroscopy [7], selective control of magnetic properties of materials [8] etc. and the real world applications like characterization of materials [9], non-invasive imaging [10], national security [11][12][13], THz communication [14], monitoring of industrial processes [15,16], biomedical applications [17] etc.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and simulation study of ‘Comb’ electron beam and THz generation

Joshi

Lehnert

Karmakar

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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A compact accelerator based super-radiant THz source is under development at Inter University Accelerator Centre (IUAC), New Delhi. The facility is based on the principle of pre-bunched Free Electron Laser (FEL) which will produce THz radiation in the range of ∼0.18 to 3 THz from a modulated electron beam. A photocathode electron gun will generate a short train of microbunches (a "comb" beam) driven by a fiber laser system capable of producing multi micro-pulse laser beam with variable separation ( "comb" laser pulse). Upon acceleration, the electron beam will be injected in to a compact undulator magnet tuned to the same frequency as the separation of the electron micro-bunches. The paper discusses the process of enhancement of super-radiant emission of radiation due to modulation in the comb beam and the conditions required to achieve maximum enhancement of the radiation power. The feasibility study of generating a comb beam at the photocathode and its transport through the beamline while preserving its temporal structure has been reported. To evaluate the characteristics of the radiation emitted from the comb beam, a C ++ based particle tracker and Liẽnard-Wiechert field solver has been developed. The conceptual understanding of the emission of radiation from comb beam is shown to conform with the numerical results. The code has been used to calculate the radiation pulse energy emitted into the central cone of undulator for various comb beam configurations.

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Selective THz control of magnetic order: new opportunities from superradiant undulator sources

Cited by 35 publications

References 31 publications

Broadband and narrowband laser-based terahertz source and its application for resonant and non-resonant excitation of antiferromagnetic modes in NiO

Broadband and narrowband laser-based terahertz source and its application for resonant and non-resonant excitation of antiferromagnetic modes in NiO

Towards Intense THz Spectroscopy on Water: Characterization of Optical Rectification by GaP, OH1, and DSTMS at OPA Wavelengths

Theoretical and simulation study of ‘Comb’ electron beam and THz generation

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