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Journal articles on the topic 'Terahertz pulses'

Author: Grafiati

Published: 22 June 2024

Last updated: 31 July 2025

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1

Gao, Feilong, Mingzhe Jiang, and Shaodong Hou. "A Chirped Characteristic-Tunable Terahertz Source for Terahertz Sensing." Sensors 24, no. 16 (2024): 5419. http://dx.doi.org/10.3390/s24165419.

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In broadband terahertz waves generated by femtosecond lasers, spatial chirp will be simultaneously produced with the introduction of angular dispersion. The chirp characteristics of the terahertz wave will directly affect the frequency response, bandwidth response, and intensity response of the terahertz sensor. To enhance the capability of terahertz sensors, it is necessary to control and improve the chirped characteristics of broadband terahertz sources. We generate a chirped terahertz wave via optical rectification in a LiNbO3 prism using the technique of pulse front tilt. The effect of the

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2

Paparo, Domenico, Anna Martinez, Andrea Rubano, Jonathan Houard, Ammar Hideur, and Angela Vella. "THz Generation by Two-Color Plasma: Time Shaping and Ultra-Broadband Polarimetry." Sensors 24, no. 13 (2024): 4265. http://dx.doi.org/10.3390/s24134265.

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The generation of terahertz radiation via laser-induced plasma from two-color femtosecond pulses in air has been extensively studied due to its broad emission spectrum and significant pulse energy. However, precise control over the temporal properties of these ultra-broadband terahertz pulses, as well as the measurement of their polarization state, remain challenging. In this study, we review our latest findings on these topics and present additional results not previously reported in our earlier works. First, we investigate the impact of chirping on the fundamental wave and the effect of mani

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3

Petrov, Nikolai I. "Dispersive Propagation of Terahertz Pulses in a Plasmonic Fiber." Fibers 11, no. 7 (2023): 62. http://dx.doi.org/10.3390/fib11070062.

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The dispersion properties of surface plasmon polaritons (SPPs) during propagation on metal wires with a dielectric coating in the terahertz frequency range were investigated theoretically. An analytical expression was obtained for a pulsed electric field using the solution of Maxwell equations taking into account high-order dispersion terms. The influence of the dielectric coating on the distortion of the pulse shape was investigated. Unlike uncoated wire, the propagation of surface plasmon pulses along a coated wire is highly dispersive. It was shown that the coating leads to the appearance o

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Архипов, Р. М., та Н. Н. Розанов. "Генерация предельно коротких импульсов терагерцового излучения на основе сверхизлучения трехуровневой резонансной среды". Оптика и спектроскопия 129, № 3 (2021): 319. http://dx.doi.org/10.21883/os.2021.03.50659.274-20.

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The possibility of generating extremely short pulses of terahertz (THz) radiation due to superradiance - collective spontaneous emission of stopped polarization of a thin layer of a three-level resonant medium excited by a pair of attosecond (or femtosecond) pulses is studied theoretically. The source of a terahertz pulse is a pulse of stopped nonlinear polarization of the medium, which occurs in the interval between its excitation and de-excitation. The case of a three-level medium with equidistant energy levels (as in a quantum harmonic oscillator), the transition frequency of which lies in

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5

Gorbatova, Anastasiya V., Pavel Yu Avdeev, Ekaterina D. Lebedeva, et al. "Terahertz Pulses Detection in Thin Ferromagnetic Films Based on Zeeman-Torque effect." Radioelectronics. Nanosystems. Information Technologies. 17, no. 2 (2025): 145–54. https://doi.org/10.17725/j.rensit.2025.17.145.

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A method for detecting terahertz pulses using thin ferromagnetic films is presented. The method is based on the ultrafast change in magnetization of a ferromagnet due to the emergence of a torque-induced magnetic moment generated by the terahertz pulse (Zeeman-torque effect). A nonlinear optical ZnTe crystal was used as the source of terahertz radiation, producing pulses with a peak electric field strength of approximately 0.1 MV/cm. The magnetization rotation was recorded using the time-resolved magneto-optical Faraday effect. The experiment demonstrated the possibility of temporally strobing

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6

Wynne, Klaas, and Dino A. Jaroszynski. "Superluminal terahertz pulses." Optics Letters 24, no. 1 (1999): 25. http://dx.doi.org/10.1364/ol.24.000025.

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7

Sazonov, S. V., and N. V. Ustinov. "New Soliton Regime of Generation of Broadband Terahertz Radiation by Laser Pulses with Tilted Wave Fronts." JETP Letters 118, no. 6 (2023): 408–13. http://dx.doi.org/10.1134/s0021364023602531.

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A new soliton-like regime of generation of terahertz radiation by optical pulses with tilted wave fronts is analyzed. It has been shown that the diffraction of an optical pulse is of fundamental importance for the formation of optical–terahertz soliton. A nonsoliton broadband terahertz component is generated synchronously with the soliton component of radiation. Two matching conditions called “super-Cherenkov” and “anti-Cherenkov” have been revealed under which generation is the most efficient. In the former and latter cases, the optical terahertz soliton propagates ahead and behind the nonsol

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8

Arkhipov M. V., Arkhipov R. M., and Rosanov N. N. "Generation of unipolar pulses of terahertz radiation with a large electric area." Optics and Spectroscopy 130, no. 8 (2022): 980. http://dx.doi.org/10.21883/eos.2022.08.54771.3703-22.

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A physical situation is proposed and theoretically analyzed, in which, in our opinion, it is possible to generate unipolar terahertz pulses with a large electric area. In this case, the gas in the tube is excited by a femtosecond IR laser pulse. In this case, the tube with gas is placed in a constant external electric field. The generation of a unipolar pulse is based on &quot;three-step scheme&quot; --- ionization of gas atoms by a femtosecond pulse, subsequent acceleration of a free electron in a dc external field and subsequent annihilation of an electron upon collision with a tube

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9

Seifert, Tom S., Liang Cheng, Zhengxing Wei, Tobias Kampfrath, and Jingbo Qi. "Spintronic sources of ultrashort terahertz electromagnetic pulses." Applied Physics Letters 120, no. 18 (2022): 180401. http://dx.doi.org/10.1063/5.0080357.

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Spintronic terahertz emitters are broadband and efficient sources of terahertz radiation, which emerged at the intersection of ultrafast spintronics and terahertz photonics. They are based on efficient spin-current generation, spin-to-charge-current conversion, and current-to-field conversion at terahertz rates. In this Editorial, we review the recent developments and applications, the current understanding of the physical processes, and the future challenges and perspectives of broadband spintronic terahertz emitters.

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10

Burmistrov E. R. and Avakyants L. P. "Determination of 2DEG parameters in LED heterostructures with three quantum wells In-=SUB=-x-=/SUB=-Ga-=SUB=-1-x-=/SUB=-N/GaN by terahertz time-domain spectroscopy (THz-TDs)." Physics of the Solid State 65, no. 2 (2023): 179. http://dx.doi.org/10.21883/pss.2023.02.55399.503.

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Terahertz time-domain spectroscopy (THz-TDs) has been used to record the resonant frequencies of plasmon oscillations excited in samples of heterostructures with three InxGa1-xN/GaN quantum wells (QWs) by laser pulses with a duration of 130 fs in the temperature range from 90 to 170 K. Fast Fourier transform (FFT) of the time dependence of the electric field of THz-pulses made it possible to obtain the frequency spectra of the power and phase shift of THz-radiation, the interpretation of which made it possible to estimate the pulse relaxation time, mobility and effective mass of two-dimensiona

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11

Чефонов, О. В., А. В. Овчинников, С. А. Евлашин та М. Б. Агранат. "Деградация и разрушение тонких стальных пленок при многократном воздействии сверхкоротких импульсов THz-излучения". Письма в журнал технической физики 45, № 11 (2019): 41. http://dx.doi.org/10.21883/pjtf.2019.11.47824.17775.

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The investigations upon destruction of thin stainless films under the action of ultrashort pulses of directional terahertz radiation are carried out. The terahertz pulse with duration within several picoseconds in fact simulates non-resonance action on matter of quasi-dc electric field with a high electric field strength (up to 20 MV/cm).

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12

Dem'yanenko M. A. and Startsev V. V. "Application of uncooled microbolometers for detecting pulsed terahertz and infrared radiation." Technical Physics 92, no. 3 (2022): 359. http://dx.doi.org/10.21883/tp.2022.03.53266.190-21.

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Analytical relations for temperature response of the bolometer to periodic radiation pulses are obtained. It is theoretically shown and experimentally confirmed by the example of infrared bolometers that when detecting short radiation pulses, in contrast to the case of constant radiation, increasing the thermal conductivity of the bolometer and, accordingly, decreasing its thermal relaxation time, it is possible to significantly increase the response rate of the receiver, practically without reducing its sensitivity. The possibility of effective registration of pulsed terahertz radiation by mi

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13

HANDLEY, J. W., NETTA COHEN, R. D. BOYLE, and ELIZABETH BERRY. "AN EMPIRICAL ANALYSIS OF NOISE IN PULSED TERAHERTZ SYSTEMS." Fluctuation and Noise Letters 06, no. 01 (2006): L65—L76. http://dx.doi.org/10.1142/s021947750600315x.

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Terahertz pulsed imaging systems use broadband pulses of sub-millimetre wavelength radiation for spectroscopy and imaging. This Letter demonstrates that a four parameter stable distribution models the observed noise of the pulses, with two of the parameters dependent on material type and thickness. We additionally show that this noise is not characterised by either Gaussian or Gaussian-mixture models.

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14

Zhang, Zhelin, Jiayang Zhang, Yanping Chen, et al. "Bessel Terahertz Pulses from Superluminal Laser Plasma Filaments." Ultrafast Science 2022 (March 2, 2022): 1–6. http://dx.doi.org/10.34133/2022/9870325.

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Terahertz radiation with a Bessel beam profile is demonstrated experimentally from a two-color laser filament in air, which is induced by tailored femtosecond laser pulses with an axicon. The temporal and spatial distributions of Bessel rings of the terahertz radiation are retrieved after being collected in the far field. A theoretical model is proposed, which suggests that such Bessel terahertz pulses are produced due to the combined effects of the inhomogeneous superluminal filament structure and the phase change of the two-color laser components inside the plasma channel. These two effects

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15

Avetisyan, Yuri, and Masayoshi Tonouchi. "Nearly Single-Cycle Terahertz Pulse Generation in Aperiodically Poled Lithium Niobate." Photonics 6, no. 1 (2019): 9. http://dx.doi.org/10.3390/photonics6010009.

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In the present work, an opportunity of nearly single-cycle THz pulse generation in aperiodically poled lithium niobate (APPLN) crystal is studied. A radiating antenna model is used to simulate the THz generation from chirped APPLN crystal pumped by a sequence of femtosecond laser pulses with chirped delays (m = 1, 2, 3 …) between adjacent pulses. It is shown that by appropriately choosing Δtm, it is possible to obtain temporal overlap of all THz pulses generated from positive (or negative) domains. This results in the formation of a nearly single-cycle THz pulse if the chirp rate of domain len

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16

Kang, Taehee, Young-Mi Bahk, and Dai-Sik Kim. "Terahertz quantum plasmonics at nanoscales and angstrom scales." Nanophotonics 9, no. 2 (2020): 435–51. http://dx.doi.org/10.1515/nanoph-2019-0436.

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AbstractThrough the manipulation of metallic structures, light–matter interaction can enter into the realm of quantum mechanics. For example, intense terahertz pulses illuminating a metallic nanotip can promote terahertz field–driven electron tunneling to generate enormous electron emission currents in a subpicosecond time scale. By decreasing the dimension of the metallic structures down to the nanoscale and angstrom scale, one can obtain a strong field enhancement of the incoming terahertz field to achieve atomic field strength of the order of V/nm, driving electrons in the metal into tunnel

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17

Liu, Xuan, Emmanuelle Jal, Renaud Delaunay, et al. "Investigating Coherent Magnetization Control with Ultrashort THz Pulses." Applied Sciences 12, no. 3 (2022): 1323. http://dx.doi.org/10.3390/app12031323.

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Coherent terahertz control of magnetization dynamics is an area of current interest due to its great potential for the realization of magnetization control on ultrafast timescales in commercial devices. Here we report on an experiment realized at the THz beamline of the free electron laser FLASH at DESY which offers a tunable terahertz radiation source and spontaneously synchronized free-electron laser X-ray pulses to resonantly probe the magnetization state of a ferromagnetic film. In this proof-of-principle experiment, we have excited a thin Permalloy film at different THz wavelengths and re

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18

Zhang, Zhenqing, Fusheng Deng, Feng Wu, and Chengjie Zhu. "Dynamical characteristics of ultrashort terahertz pulse in metamaterials." Laser Physics Letters 19, no. 5 (2022): 056001. http://dx.doi.org/10.1088/1612-202x/ac59bc.

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Abstract We develop a time-dependent theoretical approach to study the interaction between the ultrashort terahertz pulse and the metamaterials beyond the steady-state approximation. By using photoconductive silicon, we show that the system dispersion is changed from abnormal to normal via the classical interference effect. As a result, the terahertz pulse propagates through the material with subluminal/superluminal group velocity. We show that it is not accurate to predict the propagation characteristics of the terahertz pulses by using the steady-state solution of coupled wave equations, and

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19

Finneran, Ian A., Ralph Welsch, Marco A. Allodi, Thomas F. Miller, and Geoffrey A. Blake. "Coherent two-dimensional terahertz-terahertz-Raman spectroscopy." Proceedings of the National Academy of Sciences 113, no. 25 (2016): 6857–61. http://dx.doi.org/10.1073/pnas.1605631113.

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We present 2D terahertz-terahertz-Raman (2D TTR) spectroscopy, the first technique, to our knowledge, to interrogate a liquid with multiple pulses of terahertz (THz) light. This hybrid approach isolates nonlinear signatures in isotropic media, and is sensitive to the coupling and anharmonicity of thermally activated THz modes that play a central role in liquid-phase chemistry. Specifically, by varying the timing between two intense THz pulses, we control the orientational alignment of molecules in a liquid, and nonlinearly excite vibrational coherences. A comparison of experimental and simulat

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20

Демьяненко, М. А., та В. В. Старцев. "Применение неохлаждаемых микроболометров для регистрации импульсного терагерцового и инфракрасного излучения". Журнал технической физики 92, № 3 (2022): 443. http://dx.doi.org/10.21883/jtf.2022.03.52139.190-21.

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Analytical relations for temperature response of the bolometer to periodic radiation pulses are obtained. It is theoretically shown and experimentally confirmed by the example of infrared bolometers that when detecting short radiation pulses, in contrast to the case of constant radiation, increasing the thermal conductivity of the bolometer and, accordingly, decreasing its thermal relaxation time, it is possible to significantly increase the response rate of the receiver, practically without reducing its sensitivity. The possibility of effective registration of pulsed terahertz radiation by mi

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21

Malevich, Vitaly Leonidovich, Pavel Aliaksandravich Ziaziulia, Ričardas Norkus, Vaidas Pačebutas, Ignas Nevinskas, and Arūnas Krotkus. "Terahertz Pulse Emission from Semiconductor Heterostructures Caused by Ballistic Photocurrents." Sensors 21, no. 12 (2021): 4067. http://dx.doi.org/10.3390/s21124067.

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Terahertz radiation pulses emitted after exciting semiconductor heterostructures by femtosecond optical pulses were used to determine the electron energy band offsets between different constituent materials. It has been shown that when the photon energy is sufficient enough to excite electrons in the narrower bandgap layer with an energy greater than the conduction band offset, the terahertz pulse changes its polarity. Theoretical analysis performed both analytically and by numerical Monte Carlo simulation has shown that the polarity inversion is caused by the electrons that are excited in the

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22

Yang, Peidi, Baolong Zhang, Jinglong Ma, Yutong Li, Jungang Miao, and Xiaojun Wu. "Nonlinear terahertz effects of gold nanofilms." Terahertz Science and Technology 14, no. 1 (2021): 20–30. http://dx.doi.org/10.1051/tst/2021141020.

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Nonlinear interaction between strong-field terahertz electromagnetic waves and matters will become one of the next hot research frontiers in nonlinear optics. However, the lack of strong terahertz radiation sources and appropriate nonlinear terahertz materials have impeded its progress. Here we systematically have investigated the strong-field terahertz nonlinear effects of gold (Au) nanofilms on different substrates, including SiO2, high-resistivity Si and SiO2-high-resistivity Si hybrid substrates. The strong-field terahertz waves are emitted from lithium niobate crystals via tilted pulse fr

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23

Bidhendi, Mahdi M., Ivette J. Bermudez Macias, Rosen Ivanov, Mikhail V. Yurkov, and Stefan Düsterer. "FEL Pulse Duration Evolution along Undulators at FLASH." Applied Sciences 12, no. 14 (2022): 7048. http://dx.doi.org/10.3390/app12147048.

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Self-amplified spontaneous-emission (SASE) free-electron lasers (FELs) deliver ultrashort pulses with femtosecond durations. Due to the fluctuating nature of the radiation properties of SASE FELs, characterizing FEL pulses on a single-shot basis is necessary. Therefore, we use terahertz streaking to characterize the temporal properties of ultrashort extreme ultraviolet pulses from the free-electron laser in Hamburg (FLASH). In this study, pulse duration as well as pulse energy are measured in a wavelength range from 8 to 34 nm as functions of undulators contributing to the lasing process. The

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24

Zhang, Jiangquan, and D. Grischkowsky. "Whispering-gallery mode terahertz pulses." Optics Letters 27, no. 8 (2002): 661. http://dx.doi.org/10.1364/ol.27.000661.

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Kolner, B. H., R. A. Buckles, P. M. Conklin, and R. P. Scott. "Plasma Characterization With Terahertz Pulses." IEEE Journal of Selected Topics in Quantum Electronics 14, no. 2 (2008): 505–12. http://dx.doi.org/10.1109/jstqe.2007.913395.

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26

Bromage, Jake, Stojan Radic, G. P. Agrawal, Carlos R. Stroud, Jr., P. M. Fauchet, and Roman Sobolewski. "Spatiotemporal Shaping of Terahertz Pulses." Optics and Photonics News 8, no. 12 (1997): 47. http://dx.doi.org/10.1364/opn.8.12.000047.

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Bromage, Jake, Stojan Radic, G. P. Agrawal, C. R. Stroud, P. M. Fauchet, and Roman Sobolewski. "Spatiotemporal shaping of terahertz pulses." Optics Letters 22, no. 9 (1997): 627. http://dx.doi.org/10.1364/ol.22.000627.

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28

Johnson, J. L., T. D. Dorney, and D. M. Mittleman. "Interferometric imaging with terahertz pulses." IEEE Journal of Selected Topics in Quantum Electronics 7, no. 4 (2001): 592–99. http://dx.doi.org/10.1109/2944.974230.

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Dorney, Timothy D., William W. Symes, and Daniel M. Mittleman. "Multistatic Reflection Imaging with Terahertz Pulses." International Journal of High Speed Electronics and Systems 13, no. 02 (2003): 677–99. http://dx.doi.org/10.1142/s0129156403001855.

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Recent advances in the technique of terahertz time-domain spectroscopy have led to the development of the first fiber-coupled room-temperature broadband terahertz sources and detectors. The fiber coupling permits the repositioning of the emitter and receiver antennas without loss of temporal calibration or alignment, thus enabling multistatic imaging. We describe a new imaging method which exploits this new capability. This technique emulates the data collection and image processing procedures developed for geophysical prospecting. We use a migration procedure to solve the inverse problem; thi

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Sazonov, S. V., and N. V. Ustinov. "Soliton mode of terahertz radiation generation using picosecond laser pulses with tilted wave fronts." Laser Physics Letters 19, no. 2 (2022): 025401. http://dx.doi.org/10.1088/1612-202x/ac4914.

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Abstract The soliton-like mode for highly efficient generation of terahertz radiation in a quadratically nonlinear medium by means of optical pulses with tilted wave fronts is investigated. For optical and terahertz pulses, a system of the Zakharov–Boussinesq type equations describing the process of generation at arbitrary angles of the tilt of wave fronts is derived. Various cases of the soliton generation are analyzed. It is shown that the tilt of wave fronts is fundamental for the formation of the optical-terahertz solitons of a new type, which we call dispersionless solitons.

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Zvezdin, A. K., R. M. Dubrovin, and A. V. Kimel. "Giant Parametric Amplification of the Inverse Cotton–Mouton Effect in Antiferromagnetic Crystals." JETP Letters 119, no. 5 (2024): 363–71. http://dx.doi.org/10.1134/s0021364023604050.

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The interaction of light with spins in a Heisenberg antiferromagnet with a negligibly low magnetic anisotropy as in RbMnF3 has been theoretically analyzed. In particular, an optical pump–probe experiment, where coherent terahertz magnons are excited by short pump laser pulses in the antiferromagnet and are then detected by a probe pulse delayed with respect to the pump pulse, has been simulated. It has been shown that the giant increase in the intensity of excitation of terahertz magnons under the influence of the inverse Cotton–Mouton effect occurs near parametric resonance, i.e., in the para

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Hasegawa, Takayuki, and Osamu Kojima. "Effects of electric field screening induced by photogenerated carriers on terahertz wave measurement in a GaAs epitaxial structure." Applied Physics Express 17, no. 5 (2024): 051006. http://dx.doi.org/10.35848/1882-0786/ad3ee1.

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Abstract In this work we investigate the effects of electric field screening induced by photogenerated carriers on terahertz wave radiation originating from transient phenomena in the electric field region of a GaAs epitaxial structure. The transient-phenomena excitation and timing of the screening are individually controlled by a pair of ultrashort optical pulses separated by a time interval. Under the condition that the preceding pulse is intensity-modulated by an optical chopper and is irradiated to the sample, the amplitude of the terahertz wave generated by the subsequent pulse is modulat

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Jafarzadeh, Hossein, Elnaz Ahmadi Sangachin, and Seyyed Hossein Asadpour. "Controlling of group velocity via terahertz signal radiation in a defect medium doped by four-level InGaN/GaN quantum dot nanostructure." Modern Physics Letters B 29, no. 20 (2015): 1550104. http://dx.doi.org/10.1142/s0217984915501043.

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In this paper, we propose a novel scheme for controlling the group velocity of transmitted and reflected pulse from defect medium doped with four-level InGaN/GaN quantum dot nanostructure. Quantum dot nanostructure is designed numerically by Schrödinger and Poisson equations which solve self consistently. By size control of quantum dot and external voltage, one can design a four-level quantum dot with appropriate energy levels which can be suitable for controlling the group velocity of pulse transmission and reflection from defect slab with terahertz signal field. It is found that in the prese

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Emelina, Anna, Ivan Laryushin, and Alexander Romanov. "Dynamics of Gas Ionization by Laser Pulses with Different Envelope Shapes." Photonics 10, no. 5 (2023): 499. http://dx.doi.org/10.3390/photonics10050499.

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The properties of the dynamics of gas ionization under the action of femtosecond ionizing laser pulses with various envelope shapes are studied. It is shown that the duration of ionization in the saturation regime (at a high final degree of ionization) can either increase or decrease with an increase in the peak intensity of the ionizing pulse, depending on the shape of its envelope. We also determined the influence of the pulse shape on the spectrum of Brunel harmonics and the terahertz yield when two-color pulses are used.

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Bogatskaya A.V., Volkova E.A., and Popov A. M. "Self-consistent three-dimensional model of ultrashort terahertz pulse amplification in a laser-induced nonequilibrium plasma channel in xenon." Optics and Spectroscopy 130, no. 12 (2022): 1591. http://dx.doi.org/10.21883/eos.2022.12.55247.48-22.

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The propagation and amplification of ultrashort terahertz pulses in a nonequilibrium photoionization plasma channel formed in xenon by a powerful femtosecond UV laser pulse is studied in three-dimensional geometry. The study is based on the self-consistent numerical integration of the second-order wave equation in cylindrical geometry and the Boltzmann kinetic equation in the two-term expansion to describe the electron velocity distribution function in the spatially inhomogeneous nonequilibrium plasma of the channel. Keywords: nonlinear optics, terahertz radiation, nonequilibrium plasma channe

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Partini, Juliasih, Kamsul Abraha, Arief Hermanto, Satoshi Tomita, and Matsui Takahiro. "Terahertz Signal Measurement on a Chiral Metamaterial Using Terahertz Emission Spectroscopy." Applied Mechanics and Materials 771 (July 2015): 125–28. http://dx.doi.org/10.4028/www.scientific.net/amm.771.125.

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Terahertz Signal generated from chiral metamaterial due to the second order non-linear process has been observed. Chiral metamaterial used in this research have a periodic square pattern with different depth on a silver film and was fabricated by Focused Ion Beam System. Terahertz emission spectroscopy has been conducted using two amplified 100 fs laser pulses with a central wavelength of 800 nm. The emission will emerge due to an optical rectification process as a result of an intense femtosecond laser pulses radiation on a chiral metamaterial sample. The measurement result clearly shows that

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Krotkus, Arūnas, Ignas Nevinskas, and Ričardas Norkus. "Semiconductor Characterization by Terahertz Excitation Spectroscopy." Materials 16, no. 7 (2023): 2859. http://dx.doi.org/10.3390/ma16072859.

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Surfaces of semiconducting materials excited by femtosecond laser pulses emit electromagnetic waves in the terahertz (THz) frequency range, which by definition is the 0.1–10 THz region. The nature of terahertz radiation pulses is, in the majority of cases, explained by the appearance of ultrafast photocurrents. THz pulse duration is comparable with the photocarrier momentum relaxation time, thus such hot-carrier effects as the velocity overshoot, ballistic carrier motion, and optical carrier alignment must be taken into consideration when explaining experimental observations of terahertz emiss

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DUAN Haoyu, XU Xitan, ZHENG Ziyang, et al. "Modulation of Terahertz Wave Generation on Lithium Niobate Chip by Temporal Dispersion of Femtosecond Laser." Acta Physica Sinica 74, no. 15 (2025): 0. https://doi.org/10.7498/aps.74.20250573.

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The excitation of nonlinear materials by femtosecond lasers is one of the key technologies for terahertz generation at present. Owing to its advantages such as ultrashort time resolution and ultrabroad frequency spectrum, it has been widely applied in the characterization and measurement, sensing and imaging of terahertz waves. However, the methods of controlling terahertz waves through microstructures can only regulate the transmission process of terahertz waves and face obstacles such as diffcult design and complex process, making it hard to be widely used in industry. In this paper, by intr

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Wei, Yuxuan, Jiaming Le, Li Huang, and Chuanshan Tian. "Efficient generation of intense broadband terahertz pulses from quartz." Applied Physics Letters 122, no. 8 (2023): 081105. http://dx.doi.org/10.1063/5.0134139.

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Intense terahertz (THz) pulses facilitate the observation of various nonlinear optical effects and the manipulation of material properties. In this work, we report a convenient approach to produce strong broadband THz pulses with a center frequency tunable between 2 and 4 THz. A coherent THz light source with a pulse energy of 1.2 mJ can be generated from low-cost crystalline quartz using a tilted-pulse-front scheme. Thanks to the wide transparent spectral window and high damage threshold, our theoretical analysis and experiment show that the THz conversion efficiency in quartz reaches 0.05%,

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Chefonov, O. V., A. V. Ovchinnikov, and M. B. Agranat. "Study of second optical harmonic generation in terahertz pulse-induced antiferromagnetic NiO." Quantum Electronics 52, no. 3 (2022): 269–73. http://dx.doi.org/10.1070/qel17996.

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Abstract Intense terahertz pulses and a process of second harmonic generation are promising methods for exciting and studying an ultrafast dynamic response in magnetically ordered systems, ferroelectrics, and multiferroics on the picosecond time scale. In the present work, we report experimental results on generation of second optical harmonic in centrosymmetric antiferromagnetic NiO induced by intense terahertz pulses with an electric field strength of up to 20 MV cm−1.

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Wang, Bo, Gaoshuai Wei, Jianing Chen, and Li Wang. "Terahertz response of ultrafast spin polarization in semi-insulating GaAs." Applied Physics Letters 121, no. 2 (2022): 021101. http://dx.doi.org/10.1063/5.0099739.

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Due to its high sensitivity and time-resolved ability, terahertz time-domain spectroscopy is a powerful tool for investigating ultrafast carrier dynamics in semiconductors. In addition to charges, spins of ultrafast carriers provide an alternate degree of freedom to design modern electronic devices but are rarely studied by terahertz time-domain spectroscopy. Here, ultrafast spin polarization in semi-insulating GaAs is studied by optical-pump terahertz-probe experiments at room temperature. We used circularly and linearly polarized femtosecond laser pulses to inject nonequilibrium carriers in

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Opromolla, Michele, and Vittoria Petrillo. "Two-Color TeraHertz Radiation by a Multi-Pass FEL Oscillator." Applied Sciences 11, no. 14 (2021): 6495. http://dx.doi.org/10.3390/app11146495.

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In this paper, we show that an electron beam produced by a super-conducting linac, driven in a sequence of two undulator modules of different periods, can generate two-color Terahertz radiation with wavelengths ranging from 100 μm to 2 μm. The generated pulses are synchronized, both MW-class, and highly coherent. Their specific properties and generation will be discussed in detail. Besides the single-spike pulse structure, usually observed in oscillators, we show that both the THz pump and probe can be modulated in a coherent comb of pulses, enabling periodic excitation and stroboscopic measur

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Gong, Peng Wei, Zhe Ma, Hong Mei Ma, and Chun Tao Yang. "Experimental Investigation of Terahertz Temporal Response of a Photoconductive Switch." Advanced Materials Research 571 (September 2012): 491–95. http://dx.doi.org/10.4028/www.scientific.net/amr.571.491.

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Picosecond or subpicosecond electrical pulses can be generated from femtosecond laser excited photoconductive switches, and this technique is an effective method to characterize the rise time of the broadband oscilloscopes recently. In this paper, low temperature grown GaAs (LT-GaAs) is used as the substrate of the photoconductive switch which is excited by the femtosecond laser. After propagating along a coplanar waveguide, the generated terahertz pulses are transferred to a 1.85 mm coaxial cable through a microwave probe. The pulse width is measured in a 70 GHz sampling oscilloscope, the FWH

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Verma, N. K., and P. Jha. "Enhanced terahertz radiation generation by two-color laser pulses propagating in plasma." Laser and Particle Beams 34, no. 2 (2016): 378–83. http://dx.doi.org/10.1017/s0263034616000173.

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AbstractA one-dimensional (1D) numerical model for studying enhanced terahertz (THz) radiation generation by mixing of ordinary and extraordinary modes of two-color laser pulses propagating in magnetized plasma has been presented. The direction of the static external magnetic field is such that one of the two laser pulses propagates in the extraordinary mode, while the other pulse propagates in the ordinary mode, through homogeneous plasma. A transverse electromagnetic wave with frequency in the THz range is generated due to the presence of the external magnetic field. It is observed that larg

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Katayama, Ikufumi, Hiroki Kawakami, Kotaro Araki, et al. "Ultrafast carrier generation in Bi1-xSbx thin films induced by intense monocycle terahertz pulses." EPJ Web of Conferences 205 (2019): 04016. http://dx.doi.org/10.1051/epjconf/201920504016.

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Using terahertz-pump and terahertz-probe spectroscopy, we investigated terahertz-induced carrier generation processes in Bi1-xSbx thin films. The field dependence of the terahertz-induced transmittance change indicates distinct nonlinearity related to the Zener tunneling in narrow band-gap materials.

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Гинзбург, Н. С., Л. А. Юровский, А. В. Назаровский, А. С. Сергеев та И. В. Зотова. "Генерация импульсов сверхизлучения терагерцового диапазона в процессе вынужденного рассеяния лазерного излучения на попутном сильноточном релятивистском электронном пучке". Журнал технической физики 46, № 23 (2020): 8. http://dx.doi.org/10.21883/pjtf.2020.23.50339.18479.

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The possibility of generation of terahertz superradiance (SR) pulses in the case of incidental scattering of a laser pulse by a high-current relativistic electron beam with frequency conversion down is analyzed. Scattered radiation propagates in the opposite direction (with respect to the translational velocity of the particles). It is shown that when using pulses with an energy of 3 kJ at a wavelength of 1 μm as a pump during optimization of the laser pulse duration and the length of the interaction region, it is possible to generate pulses of scattered counter (relative to the translational

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Voevodin, Vladimir, Svetlana Bereznaya, Yury S. Sarkisov, Nikolay N. Yudin, and Sergey Yu Sarkisov. "Terahertz Generation by Optical Rectification of 780 nm Laser Pulses in Pure and Sc-Doped ZnGeP2 Crystals." Photonics 9, no. 11 (2022): 863. http://dx.doi.org/10.3390/photonics9110863.

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Terahertz wave generation through the optical rectification of 780 nm femtosecond laser pulses in ZnGeP2 crystals has been studied. All of the possible interactions of types I and II were analyzed by modeling and experimentally. We demonstrate the possibility of broadband “low-frequency” terahertz generation by an ee–e interaction (with two pumping waves and a generated terahertz wave; all of these had extraordinary polarization in the crystal) and “high-frequency” terahertz generation by an oe–e interaction. The arising possibility of achieving the narrowing of the terahertz generation bandwi

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Yano, Kaori, and Toshiaki Hattori. "Improving a Terahertz Time-Domain Spectroscopy Apparatus Using Neodymium Magnets." International Letters of Chemistry, Physics and Astronomy 62 (November 2015): 10–14. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.62.10.

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The signal-to-noise ratio obtained from terahertz time-domain spectroscopy is significantly affected by the low available power of terahertz waves. We constructed a terahertz-wave source with emission power enhanced by a magnetic field. The emitter is composed of an InAs wafer and two neodymium magnets. The emitter was irradiated by femtosecond laser pulses. The data quality of terahertz spectroscopic measurements was evaluated, and reduction of error in the data obtained due to the terahertz power enhancement was observed.

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Yano, Kaori, and Toshiaki Hattori. "Improving a Terahertz Time-Domain Spectroscopy Apparatus Using Neodymium Magnets." International Letters of Chemistry, Physics and Astronomy 62 (November 27, 2015): 10–14. http://dx.doi.org/10.56431/p-cw453x.

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The signal-to-noise ratio obtained from terahertz time-domain spectroscopy is significantly affected by the low available power of terahertz waves. We constructed a terahertz-wave source with emission power enhanced by a magnetic field. The emitter is composed of an InAs wafer and two neodymium magnets. The emitter was irradiated by femtosecond laser pulses. The data quality of terahertz spectroscopic measurements was evaluated, and reduction of error in the data obtained due to the terahertz power enhancement was observed.

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Li, Hang, Ping Chen, Jin-Shou Tian, et al. "High time-resolution detector based on THz pulse accelerating and scanning electron beam." Acta Physica Sinica 71, no. 2 (2022): 028501. http://dx.doi.org/10.7498/aps.71.20210871.

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Terahertz pulses accelerating and scanning electron beam can break through the limitation of accelerating electric field between cathodes and grids in traditional streak tubes, thus reducing the time dispersion and enhancing the temporal resolution of time-scanning detectors. Based on this new technology, in this paper an ultra-small structured time-resolved detector with no focusing pole is designed. The terahertz pulse coupling/enhancing device suitable for acceleration zone and scanning zone is designed and optimized. The enhanced coefficient of the terahertz pulse electric field in the dev

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