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Готові списки джерел за темами / THz emission sources / Статті в журналах

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Статті в журналах з теми "THz emission sources"

Автор: Grafiati

Опубліковано: 22 лютого 2025

Оновлено: 31 липня 2025

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1

Andronov, A. A., A. V. Ikonnikov, K. V. Maremianin, et al. "THz stimulated emission from simple superlattice in positive differential conductivity region." Физика и техника полупроводников 52, no. 4 (2018): 463. http://dx.doi.org/10.21883/ftp.2018.04.45812.01.

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AbstractNarrow band emissions at 2.6–2.8 THz are observed out of liquid helium cooled 1 mm disk chips prepared of a wafer with the very low n type doped weak barrier GaAs–GaAlAs superlattice of 1000 periods. The emissions are at about 8.0–18.0 V pulsed voltage applied to the chips in region of the chips positive DC differential conductivity that guaranties absence of inhomogeneous electric field domains in the chips. The emission frequency bands are estimated with a cyclotron resonance filter; the measurements show that the band width is of about that of the THz quantum cascade laser. By using

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2

Wang, Maorong, Yifan Zhang, Leilei Guo, Mengqi Lv, Peng Wang, and Xia Wang. "Spintronics Based Terahertz Sources." Crystals 12, no. 11 (2022): 1661. http://dx.doi.org/10.3390/cryst12111661.

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Terahertz (THz) sources, covering a range from about 0.1 to 10 THz, are key devices for applying terahertz technology. Spintronics-based THz sources, with the advantages of low cost, ultra-broadband, high efficiency, and tunable polarization, have attracted a great deal of attention recently. This paper reviews the emission mechanism, experimental implementation, performance optimization, manipulation, and applications of spintronic THz sources. The recent advances and existing problems in spintronic THz sources are fully present and discussed. This review is expected to be an introduction of

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3

Hu, Qing. "Generation of Terahertz Emission Based on Intersubband Transitions." International Journal of High Speed Electronics and Systems 12, no. 04 (2002): 995–1024. http://dx.doi.org/10.1142/s0129156402001897.

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In this chapter, we present our work on the development of coherent THz sources based on intersubband transition in quantum-well structures. The main focus is on electrically pumped or quantum-cascade structures, which have been quite successful in generating coherent radiation at mid-infrared frequencies. Relevant issues, such as various depopulation intersubband scattering rates, the role of complex phonon spectra, and coherent vs. incoherent tunneling are discussed in details. Optically pumped sources, including optical parametric amplifiers, and both intersubband and interband pumped THz e

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4

Wang, Suyun. "Terahertz Emission Modeling of Lunar Regolith." Remote Sensing 16, no. 21 (2024): 4037. http://dx.doi.org/10.3390/rs16214037.

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We investigate the terahertz (THz) scattering and emission properties of lunar regolith by modeling it as a random medium with rough top and bottom boundaries and a host medium situated beneath. The total scattering and emission arise from three sources: the rough boundaries, the volume, and the interactions between the boundaries and the volume. To account for these sources, we model their respective phase matrices and apply the matrix doubling approach to couple these phase matrices to compute the total emission. The model is then used to explore insights into lunar regolith scattering and e

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5

Minkevičius, Linas, Liang Qi, Agnieszka Siemion, et al. "Titanium-Based Microbolometers: Control of Spatial Profile of Terahertz Emission in Weak Power Sources." Applied Sciences 10, no. 10 (2020): 3400. http://dx.doi.org/10.3390/app10103400.

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Terahertz (THz) imaging and spectroscopy set-ups require fine optical alignment or precise control of spatial mode profile. We demonstrate universal, convenient and easy-to-use imaging—resonant and broadband antenna coupled ultrasensitive titanium-based—dedicated to accurately adjust and control spatial mode profiles without additional focusing optical components of weak power THz sources. Versatile operation of the devices is shown using different kinds of THz—electronic multiplier sources, optical THz mixer-based frequency domain and femtosecond optoelectronic THz time-domain spectrometers a

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6

Chen, Yuxuan, Yuhang He, Liyuan Liu, Zhen Tian, Jianming Dai, and Xi-Cheng Zhang. "Backward THz Emission from Two-Color Laser Field-Induced Air Plasma Filament." Sensors 23, no. 10 (2023): 4630. http://dx.doi.org/10.3390/s23104630.

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Two-color laser field-induced plasma filaments are efficient broadband terahertz (THz) sources with intense THz waves emitted mainly in the forward direction, and they have been investigated intensively. However, investigations on the backward emission from such THz sources are rather rare. In this paper, we theoretically and experimentally investigate the backward THz wave radiation from a two-color laser field-induced plasma filament. In theory, a linear dipole array model predicts that the proportion of the backward emitted THz wave decreases with the length of the plasma filament. In our e

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7

Huang, Hsin-hui, Takeshi Nagashima, Wei-hung Hsu, Saulius Juodkazis, and Koji Hatanaka. "Dual THz Wave and X-ray Generation from a Water Film under Femtosecond Laser Excitation." Nanomaterials 8, no. 7 (2018): 523. http://dx.doi.org/10.3390/nano8070523.

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Simultaneous emission of the THz wave and hard X-ray from thin water free-flow was induced by the irradiation of tightly-focused femtosecond laser pulses (35 fs, 800 nm, 500 Hz) in air. Intensity measurements of the THz wave and X-ray were carried out at the same time with time-domain spectroscopy (TDS) based on electro-optic sampling with a ZnTe(110) crystal and a Geiger counter, respectively. Intensity profiles of the THz wave and X-ray emission as a function of the solution flow position along the incident laser axis at the laser focus show that the profile width of the THz wave is broader

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8

Hawecker, J., E. Rongione, A. Markou, et al. "Spintronic THz emitters based on transition metals and semi-metals/Pt multilayers." Applied Physics Letters 120, no. 12 (2022): 122406. http://dx.doi.org/10.1063/5.0079955.

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Spintronic terahertz (THz) emitters based on the inverse spin Hall effect in ferromagnetic/heavy metal (FM/HM) heterostructures have become important sources for THz pulse generation. The design, materials, and control of these interfaces at the nanometer level have become vital to engineer their THz emission properties. In this work, we present studies of the optimization of such structures through a multi-pronged approach, taking advantage of material and interface engineering to enhance THz spintronic emission. This includes the application of multi-stacks of HM/FM junctions and their appli

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9

Lange, Simon Jappe, Matthias C. Hoffmann, and Peter Uhd Jepsen. "Lightwave-driven electron emission for polarity-sensitive terahertz beam profiling." APL Photonics 8, no. 1 (2023): 016105. http://dx.doi.org/10.1063/5.0125947.

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The full exploitation of advanced light sources in the terahertz (THz) frequency range requires versatile experimental tools to fully characterize the spatial, temporal, and spectral shapes of the THz electric field. Several techniques for passive THz beam profiling exist that offer information about the temporally integrated intensity. Thus, any information about the electric field itself is lost. Here, we show that a UV–visible light emission produced via a lightwave-driven field emission from single-layer metasurfaces can be used to visualize the peak electric field distribution of THz beam

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10

Consolino, Luigi, Malik Nafa, Michele De Regis, et al. "Direct Observation of Terahertz Frequency Comb Generation in Difference-Frequency Quantum Cascade Lasers." Applied Sciences 11, no. 4 (2021): 1416. http://dx.doi.org/10.3390/app11041416.

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Terahertz quantum cascade laser sources based on intra-cavity difference frequency generation from mid-IR devices are an important asset for applications in rotational molecular spectroscopy and sensing, being the only electrically pumped device able to operate in the 0.6–6 THz range without the need of bulky and expensive liquid helium cooling. Here we present comb operation obtained by intra-cavity mixing of a distributed feedback laser at λ = 6.5 μm and a Fabry–Pérot device at around λ = 6.9 μm. The resulting ultra-broadband THz emission extends from 1.8 to 3.3 THz, with a total output powe

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11

Locovei, Claudiu, Garik Torosyan, Evangelos Th Papaioannou, Alina D. Crisan, Rene Beigang, and Ovidiu Crisan. "Structural, Magnetic and THz Emission Properties of Ultrathin Fe/L10-FePt/Pt Heterostructures." Nanomaterials 15, no. 14 (2025): 1099. https://doi.org/10.3390/nano15141099.

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Recent achievements in ultrafast spin physics have enabled the use of heterostructures composed of ferromagnetic (FM)/non-magnetic (NM) thin layers for terahertz (THz) generation. The mechanism of THz emission from FM/NM multilayers has been typically ascribed to the inverse spin Hall effect (ISHE). In this work, we probe the mechanism of the ISHE by inserting a second ferromagnetic layer in the form of an alloy between the FM/NM system. In particular, by utilizing the co-sputtering technique, we fabricate Fe/L10-FePt/Pt ultra-thin heterostructures. We successfully grow the tetragonal phase of

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12

Rakesh Kumar, V., Kamalesh Jana, Indranuj Dey, et al. "Spectral and intensity control of high energy terahertz radiation from bulk liquids." Journal of Physics D: Applied Physics 55, no. 9 (2021): 095107. http://dx.doi.org/10.1088/1361-6463/ac3455.

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Abstract High power, broadband terahertz (THz) radiation from liquids, excited by intense, femtosecond 800 nm laser pulses has been demonstrated recently, overturning the long held belief that liquids would not give such emission due to their absorption in the THz region. Given the widespread interest in the use of THz radiation for several applications and the energy and bandwidth limitations of existing sources, liquids are expected to attract great attention in the future. While the emission at tens of microjoules from liquids is very promising, it is important to explore whether control of

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13

Fujita, Kazuue, Seungyong Jung, Yifan Jiang, et al. "Recent progress in terahertz difference-frequency quantum cascade laser sources." Nanophotonics 7, no. 11 (2018): 1795–817. http://dx.doi.org/10.1515/nanoph-2018-0093.

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AbstractTerahertz quantum cascade laser (QCL) sources based on intra-cavity difference frequency generation are currently the only electrically pumped monolithic semiconductor light sources operating at room temperature in the 1–6-THz spectral range. Relying on the active regions with the giant second-order nonlinear susceptibility and the Cherenkov phase-matching scheme, these devices demonstrated drastic improvements in performance in the past several years and can now produce narrow-linewidth single-mode terahertz emission that is tunable from 1 to 6 THz with power output sufficient for ima

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14

Abbes, Alaeddine, Annick Pénarier, Philippe Nouvel, Arnaud Garnache, and Stéphane Blin. "Multipolar Photoconductive Antennas for THz Emission Driven by a Dual-Frequency Laser Based on Transverse Modes." Electronics 12, no. 22 (2023): 4679. http://dx.doi.org/10.3390/electronics12224679.

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Continuous-wave tunable photonics-based THz sources present limited output power due to the restricted input optical power accepted by photomixers, along with reduced radiation resulting from low paraxial field amplitude. Here, we investigate multipolar antenna designs to increase the available continuous-wave THz output power by incorporating more photomixers. For this purpose, the spatial structures of the optical and THz E-fields are designed to enhance THz power and radiation in the far field. Simulations of 2 to 4 dipole antennas are conducted, demonstrating an improvement in antenna gain

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15

Li, Xin Xing, Xiao Yu Zhang, Hua Qin, and Bao Shun Zhang. "Design of a Cryogenic Terahertz Fourier Transform Spectrometer." Advanced Materials Research 571 (September 2012): 352–56. http://dx.doi.org/10.4028/www.scientific.net/amr.571.352.

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With the rapid development of the terahertz technique, many new devices are developed in recent years, and most of them need cryogenic environment. To evaluate the characteristics of these devices at low temperature, a cryogenic terahertz Fourier transform spectrometer system (THz-FTS) is designed and developed. With the different combinations of terahertz sources and detectors, this THz-FTS system can test the frequency response of the detectors, the emission spectrum of the sources, and the transmittance of material in the cryogenic environment at terahertz frequency range and also the basic

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16

Zhang, Jinying, Bingnan Wang, Rui Wang, Jiacheng Wang, Xinye Wang, and Yexiaotong Zhang. "Multiple Broadband Infrared Topological Photonic Crystal Valley States Based on Liquid Crystals." Materials 17, no. 21 (2024): 5212. http://dx.doi.org/10.3390/ma17215212.

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Spectral tunable technology has to meet the requirements of strong robustness and wide spectral range. We propose a method for the transmission and manipulation of infrared topological photonic crystal valley states based on tunable refractive index method that exhibits broad-spectrum and multi-band characteristics, along with a tunable emission angle. With this structure, different rotational directions of vortex light sources can independently excite the K valley and K′ valley within the frequency band ranging from 75.64 THz to 99.61 THz. At frequencies from 142.60 THz to 171.12 THz, it is p

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17

Novelli, Fabio, Biswajit Guchhait, and Martina Havenith. "Towards Intense THz Spectroscopy on Water: Characterization of Optical Rectification by GaP, OH1, and DSTMS at OPA Wavelengths." Materials 13, no. 6 (2020): 1311. http://dx.doi.org/10.3390/ma13061311.

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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 Phosphid

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18

Shipilo, D. E., I. A. Nikolaeva, D. V. Pushkarev, et al. "Balance of emission from THz sources in DC-biased and unbiased filaments in air." Optics Express 29, no. 25 (2021): 40687. http://dx.doi.org/10.1364/oe.442534.

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19

Kumar, Manoj, Teyoun Kang, Hyung Seon Song, and Min Sup Hur. "Particle-in-cell simulations of THz emission from plasma by oblique collision of two-electron beams." Physics of Plasmas 29, no. 3 (2022): 033102. http://dx.doi.org/10.1063/5.0073570.

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We studied the THz radiation generated by a beam-plasma system using two-dimensional (2D) particle-in-cell (PIC) simulations. The Langmuir waves excited by two counterpropagating electron beams, via two-stream instability, collide with each other at an oblique angle, which forms a high beam-density modulation near the collision region, where both beam electrons become trapped. As a result, spatially localized Langmuir wave packets with large longitudinal-electric field amplitudes are formed, which give rise to bursts of electromagnetic radiation. Our 2D PIC simulations of the two thin, low-den

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20

WRABACK, MICHAEL, GRACE D. CHERN, ERIC D. READINGER, et al. "INDIUM NITRIDE: A NEW MATERIAL FOR HIGH EFFICIENCY, COMPACT, 1550nm LASER-BASED TERAHERTZ SOURCES IN CHEMICAL AND BIOLOGICAL DETECTION." International Journal of High Speed Electronics and Systems 18, no. 01 (2008): 3–9. http://dx.doi.org/10.1142/s0129156408005084.

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Indium nitride ( InN ) is identified as a promising terahertz (THz) emitter based on the optical and electronic properties of high quality In - and N -face samples. Time domain THz spectroscopy has been employed to measure the pump wavelength and background carrier concentration dependence of THz emission from InN . There is no discernable difference between the In - and N -face InN samples, as expected for the improved crystalline quality and concomitant low background electron density and high mobility for both polarities. While there is only a weak dependence of THz signal on pump wavelengt

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21

Shahrir R. Kasjoo, Arun K. Singh, Claudio Balocco, and Aimin Song. "Terahertz Imaging Using Nanorectifier-Based Detectors and Broadband Thermal Sources." International Journal of Nanoelectronics and Materials (IJNeaM) 16, DECEMBER (2023): 143–53. http://dx.doi.org/10.58915/ijneam.v16idecember.400.

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Several terahertz imaging experiments have been conducted at room temperature using a self-switching diode (SSD) rectenna as a detector, and a broadband thermal source (at 610 °C) as a continuous-wave terahertz generator. Since the terahertz emission produced by the source is non-coherent with random polarizations and has a wide-ranging spectrum, the SSD-based rectenna employed in this work utilizes a planar spiral micro- antenna which has a circular polarization that able to effectively capture all incident radiation regardless of the angles. The antenna has been designed for a broadband freq

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22

Shimawaki, Hidetaka, Masayoshi Nagao, and Katsuhisa Murakami. "(Invited) Photo-Assisted Electron Emission from Silicon-Based Electron Emission Devices." ECS Meeting Abstracts MA2023-02, no. 30 (2023): 1533. http://dx.doi.org/10.1149/ma2023-02301533mtgabs.

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Ultrafast pulsed electron sources with spatial coherence have attracted significant interest in emerging applications such as scientific instruments of ultrafast electron microscopy [1-3] and electron beam lithography [4], and also as sources of X-ray [5] and micro- and THz-waves [6-9]. In particular, high-frequency electron bunch trains generated directly from the cathode surface can not only dramatically reduce dimensions and weight through the elimination of the pre-modulation circuit, but can also provide extremely high efficiency and improve the power in the electron beam devices due to c

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23

Volkov, O. Y., I. N. Duzhikov, R. A. Khabibullin, A. N. Baranov, and Y. Y. Divin. "Subterahertz difference-frequency generation in terahertz quantum cascade lasers." Applied Physics Letters 121, no. 26 (2022): 263504. http://dx.doi.org/10.1063/5.0135562.

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We have detected subterahertz spectral lines in the emission of free-running GaAs/AlGaAs quantum cascade lasers (QCLs) operating around 3 THz. We have found that the power W( fd) of an individual sub-THz line at the frequency fd is directly proportional to a power product W( fi) × W( fk) of the corresponding pair of THz lines having the frequency difference fi − fk = fd. The established one-to-one correspondence of each sub-THz line to pair combinations of THz lines proves the nonlinear mechanism of difference-frequency generation (DFG) in the QCL active region. The conversion efficiencies W(

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24

Valušis, Gintaras, Alvydas Lisauskas, Hui Yuan, Wojciech Knap, and Hartmut G. Roskos. "Roadmap of Terahertz Imaging 2021." Sensors 21, no. 12 (2021): 4092. http://dx.doi.org/10.3390/s21124092.

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In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and miniaturization of the THz imaging systems. Such systems entail enhanced functionality, reduced power consumption, and increased convenience, thus being geared toward the implementation of THz imaging systems in real operational conditions. The article will touch upon the advanced solid-state-based THz imaging systems, including room temperature THz sensors and arrays, as well as their on-chip integration with diffractive THz optical components.

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25

Lerch, Ph, P. Dumas, T. Schilcher, et al. "Assessing noise sources at synchrotron infrared ports." Journal of Synchrotron Radiation 19, no. 1 (2011): 1–9. http://dx.doi.org/10.1107/s0909049511041884.

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Today, the vast majority of electron storage rings delivering synchrotron radiation for general user operation offer a dedicated infrared port. There is growing interest expressed by various scientific communities to exploit the mid-IR emission in microspectroscopy, as well as the far infrared (also called THz) range for spectroscopy. Compared with a thermal (laboratory-based source), IR synchrotron radiation sources offer enhanced brilliance of about two to three orders of magnitude in the mid-IR energy range, and enhanced flux and brilliance in the far-IR energy range. Synchrotron radiation

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26

Ushakov, Aleksandr, Pavel Chizhov, Irina Nikolaeva та ін. "Superposition of 2ω and Electrostatic Field Induced Terahertz Waveforms in DC-Biased Two-Color Filament". Applied Sciences 11, № 24 (2021): 11888. http://dx.doi.org/10.3390/app112411888.

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Increase in conversion efficiency from a femtosecond optical pump into broadband terahertz (THz) radiation is currently an essential issue since it boosts THz source performance for medicine and security applications. An air-plasma based THz radiation from a two-color femtosecond filament is the most efficient gas-based THz emitter, with a dipole local source having a maximum on the beam propagation axis. In this work, we show the novel advancement to THz yield increase with preservation of the forwardly directed dipole radiation. The two-color THz source can be enhanced if the filament plasma

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27

Moldosanov, К. А., and V. M. Lelevkin. "Method for Effective Increasing the Decomposition Rate of Ammonium Perchlorate in Solid Rocket Fuel." Bulletin of the Karaganda University "Physics Series" 11629, no. 4 (2024): 74–82. https://doi.org/10.31489/2024ph4/74-82.

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Ammonium perchlorate (AP) is a common oxidizer in solid rocket propellants. For devices, the most im- portant parameter of which is the speed of movement, the key correlation is between the jet thrust and the combustion rate of fuels and, consequently, the rate of thermal decomposition of the AP. To increase the de- composition rate of AP, fuel, aluminum powder, is used in the form of nanoparticles. The aim of this work is to identify the decomposition mechanism of AP molecules under conditions where aluminum nanoparticles, in addition to acting as a fuel, also act as catalysts for the decompo

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28

Herpin, F., A. Baudry, A. M. S. Richards, et al. "First detection of a THz water maser in NGC 7538-IRS1 with SOFIA and new 22 GHz e-MERLIN maps." Astronomy & Astrophysics 606 (October 2017): A52. http://dx.doi.org/10.1051/0004-6361/201731056.

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Context. The formation of massive stars (M> 10M⊙, L > 103L⊙) is still not well understood. Accumulating a large amount of mass infalling within a single entity in spite of radiation pressure is possible if, in addition to several other conditions, enough thermal energy is released. Despite numerous water line observations over a broad range of energies obtained with the Herschel Space Observatory, observations were not able to trace the emission from the hot core around the newly forming protostellar object in most of the sources. Aims. We wish to probe the physical conditions and water

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29

Li, Yuyu, Khwanchai Tantiwanichapan, Anna K. Swan, and Roberto Paiella. "Graphene plasmonic devices for terahertz optoelectronics." Nanophotonics 9, no. 7 (2020): 1901–20. http://dx.doi.org/10.1515/nanoph-2020-0211.

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AbstractPlasmonic excitations, consisting of collective oscillations of the electron gas in a conductive film or nanostructure coupled to electromagnetic fields, play a prominent role in photonics and optoelectronics. While traditional plasmonic systems are based on noble metals, recent work has established graphene as a uniquely suited materials platform for plasmonic science and applications due to several distinctive properties. Graphene plasmonic oscillations exhibit particularly strong sub-wavelength confinement, can be tuned dynamically through the application of a gate voltage, and span

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30

Xu, J., F. Schreier, P. Vogt, A. Doicu, and T. Trautmann. "A sensitivity study for far infrared balloon-borne limb emission sounding of stratospheric trace gases." Geoscientific Instrumentation, Methods and Data Systems Discussions 3, no. 1 (2013): 251–303. http://dx.doi.org/10.5194/gid-3-251-2013.

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Abstract. This paper presents a sensitivity study performed for trace gases retrieval from synthetic observations by TELIS (TErahertz and submillimeter LImb Sounder) which is a stratospheric balloon-borne cryogenic heterodyne spectrometer. Issues pertaining to hydroxyl radical (OH) retrieval from the far infrared measurements by the 1.8 THz channel are addressed. The study is conducted by a retrieval code PILS (Profile Inversion for Limb Sounding) developed to solve the nonlinear inverse problems arising in the analysis of infrared/microwave limb sounding measurements. PILS combines a line-by-

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31

Zolani, Ndlovu. "Assessing the role of area sources in air quality: A comprehensive review." World Journal of Advanced Research and Reviews 23, no. 2 (2024): 1462–72. https://doi.org/10.5281/zenodo.14859427.

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Air pollution poses significant challenges to environmental quality and public health. The array of factors contributing to air pollution necessitates a focus on three primary source categories namely point sources, mobile sources, and area sources. Point sources, typified by industrial facilities and power plants, emit pollutants from stationary positions, facilitating monitoring and regulatory interventions. Conversely, mobile sources including vehicles and aircraft, which emit pollutants while in motion, present a level of logistical challenges for control measures. Area sources, encompassi

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Kumar, Ashish, Vinayak Sinha, Muhammed Shabin, Haseeb Hakkim, Bernard Bonsang, and Valerie Gros. "Non-methane hydrocarbon (NMHC) fingerprints of major urban and agricultural emission sources for use in source apportionment studies." Atmospheric Chemistry and Physics 20, no. 20 (2020): 12133–52. http://dx.doi.org/10.5194/acp-20-12133-2020.

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Abstract. In complex atmospheric emission environments such as urban agglomerates, multiple sources control the ambient chemical composition driving air quality and regional climate. In contrast to pristine sites, where reliance on single or a few chemical tracers is often adequate for resolving pollution plumes and source influences, the comprehensive chemical fingerprinting of sources using non-methane hydrocarbons (NMHCs) and the identification of suitable tracer molecules and emission ratios becomes necessary. Here, we characterise and present chemical fingerprints of some major urban and

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Krasnov, Mikhail M., Natalia D. Novikova, Roger Cattaneo, Alexey A. Kalenyuk та Vladimir M. Krasnov. "Design aspects of Bi₂Sr₂CaCu₂O_8+δ THz sources: optimization of thermal and radiative properties". Beilstein Journal of Nanotechnology 12 (21 грудня 2021): 1392–403. http://dx.doi.org/10.3762/bjnano.12.103.

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Impedance matching and heat management are important factors influencing the performance of terahertz sources. In this work we analyze thermal and radiative properties of such devices based on mesa structures of a layered high-temperature superconductor Bi2Sr2CaCu2O8+δ. Two types of devices are considered containing either a conventional large single crystal or a whisker. We perform numerical simulations for various geometrical configurations and parameters and make a comparison with experimental data for the two types of devices. It is demonstrated that the structure and the geometry of both

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López, Fernando M., Carlos Guillermo Giménez de Castro, Cristina H. Mandrini, et al. "A solar flare driven by thermal conduction observed in mid-infrared." Astronomy & Astrophysics 657 (January 2022): A51. http://dx.doi.org/10.1051/0004-6361/202141967.

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Context. The mid-infrared (mid-IR) range has been mostly unexplored for the investigation of solar flares. It is only recently that new mid-IR flare observations have begun opening a new window into the response and evolution of the solar chromosphere. These new observations have been mostly performed by the AR30T and BR30T telescopes that are operating in Argentina and Brazil, respectively. Aims. We present the analysis of SOL2019-05-15T19:24, a GOES class C2.0 solar flare observed at 30 THz (10 μm) by the ground-based telescope AR30T. Our aim is to characterize the evolution of the flaring a

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Awua, Justin, Aondoyila Kuhe, Victor Archigbenda, Alexander Agada, and Lukman Adama. "ASSESSMENT OF THE GREENHOUSE GAS EMISSIONS PATTERNS OF HOTELS IN ABUJA, NIGERIA." International Journal of Engineering Technology Research & Management (IJETRM) 09, no. 05 (2025): 442–51. https://doi.org/10.5281/zenodo.15520860.

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A study on the assessment of the greenhouse gas emissions patterns of sellected hotels in Abuja, Nigeriawas carried out. Two hotels were considered and categorized as Cases1 and Case 2 respectively. Fourmajor emission sources: electricity; transportation; solid waste and cooking fuels were considered. Dataon the sources were obtained using records from relevant departments, questionnaires, surveys, andinterviews. This data was analyzed and used for calculating the GHG emissions of the hotels usingIPCC standard guidelines and formulae. The annual GHG emissions of the Case 1 was found to be479.9

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Foteinopoulou, Stavroula, Ganga Chinna Rao Devarapu, Ganapathi S. Subramania, Sanjay Krishna, and Daniel Wasserman. "Phonon-polaritonics: enabling powerful capabilities for infrared photonics." Nanophotonics 8, no. 12 (2019): 2129–75. http://dx.doi.org/10.1515/nanoph-2019-0232.

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AbstractHere, we review the progress and most recent advances in phonon-polaritonics, an emerging and growing field that has brought about a range of powerful possibilities for mid- to far-infrared (IR) light. These extraordinary capabilities are enabled by the resonant coupling between the impinging light and the vibrations of the material lattice, known as phonon-polaritons (PhPs). These PhPs yield a characteristic optical response in certain materials, occurring within an IR spectral window known as the reststrahlen band. In particular, these materials transition in the reststrahlen band fr

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Pacyna, Jozef M., M. Trevor Scholtz, and Y. F. (Arthur) Li. "Global budget of trace metal sources." Environmental Reviews 3, no. 2 (1995): 145–59. http://dx.doi.org/10.1139/a95-006.

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Global emission inventories, being the key information for the global budgets of trace metals, have become available only recently. The latest information on emissions and sources of trace metals on a global scale is presented in this paper. As the global assessments are prepared on the basis of estimates of regional emissions, these latter data are also reviewed here. A comparison of the worldwide atmospheric emissions from natural and anthropogenic sources suggests that various human activities are the dominant source of many trace metals, including As, Cd, Pb, and Zn. A comparison of the at

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Mustafaev, Islam I., Lala Y. Jabbarova та Zargalam O. Nabizade. "Инвентаризация источников поступления ртути в окружающую среду в Азербайджане". Химическая безопасность / Chemical Safety Science 5, № 2 (2021): 272–91. http://dx.doi.org/10.25514/chs.2021.2.20017.

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Mercury is one of the most toxic metals and is widely used in the environment. It is a heavy liquid metal, which contains extremely dangerous substances that pollute the atmosphere, water, food. Sources of mercury emissions - mining and smelting of mercury-containing ores from sulphide ores, extraction of non-ferrous metals, gold from ore, bleaching of cellulose, chlorine, caustic, vinyl chloride, electrical equipment (lamps, various power sources), measuring and control devices (thermometer, monometer), mercury-containing preparations, cement production , use of mercury-containing pesticides,

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Kholod, Nazar, Meredydd Evans, and Teresa Kuklinski. "Russia's black carbon emissions: focus on diesel sources." Atmospheric Chemistry and Physics 16, no. 17 (2016): 11267–81. http://dx.doi.org/10.5194/acp-16-11267-2016.

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Abstract. Black carbon (BC) is a significant climate forcer with a particularly pronounced forcing effect in polar regions such as the Russian Arctic. Diesel combustion is a major global source of BC emissions, accounting for 25–30 % of all BC emissions. While the demand for diesel is growing in Russia, the country's diesel emissions are poorly understood. This paper presents a detailed inventory of Russian BC emissions from diesel sources. Drawing on a complete Russian vehicle registry with detailed information about vehicle types and emission standards, this paper analyzes BC emissions from

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Kasseh, Y., A. Touzani, and S. EL Majaty. "Production of a Database on Short-Lived Climate Pollutants (SLCP) and the Elaboration of Projection Scenarios of these Emissions Using the LEAP Software - The Case of Morocco." Nature Environment and Pollution Technology 22, no. 4 (2023): 2103–10. http://dx.doi.org/10.46488/nept.2023.v22i04.035.

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Short-lived climate pollutants (SLCPs) have significant effects on climate, human health, and the environment. In Morocco, steps are being taken to reduce SLCP emissions, but effective policymaking requires a thorough understanding of emission sources and trends. In this paper, we present a study on the production of a database on SLCP emissions in Morocco, as well as the development of scenarios to project these emissions using LEAP software. The results of this analysis allow us to better understand the emissions sources and evaluate the impact of different emission reduction policies.

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Yang, Deai, Mingjun Li, Xingyi Geng, and Zhihui Feng. "Sources and Specified Health Risks of 12 PM2.5-Bound Metals in a Typical Air-Polluted City in Northern China during the 13th Five-Year Plan." Toxics 12, no. 8 (2024): 581. http://dx.doi.org/10.3390/toxics12080581.

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The continuous monitoring of PM2.5 (including 12 metal elements) was conducted in Jinan, a city with poor air quality in China, during the 13th Five-Year Plan (2016–2020). Positive matrix factorization (PMF) was used to identify emission sources of PM2.5-bound metals, and the health risks of the metals and their emission sources were assessed. During the study period, the concentration of most metals showed a decreasing trend (except Al and Be), and a significant seasonal difference was found: winter > fall > spring > summer. The PMF analysis showed that there were four main sources o

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Shusterman, Alexis A., Jinsol Kim, Kaitlyn J. Lieschke, Catherine Newman, Paul J. Wooldridge, and Ronald C. Cohen. "Observing local CO<sub>2</sub> sources using low-cost, near-surface urban monitors." Atmospheric Chemistry and Physics 18, no. 18 (2018): 13773–85. http://dx.doi.org/10.5194/acp-18-13773-2018.

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Abstract. Urban carbon dioxide comprises the largest fraction of anthropogenic greenhouse gas emissions, but quantifying urban emissions at subnational scales is highly challenging, as numerous emission sources reside in close proximity within each topographically intricate urban dome. In attempting to better understand each individual source's contribution to the overall emission budget, there exists a large gap between activity-based emission inventories and observational constraints on integrated, regional emission estimates. Here we leverage urban CO2 observations from the BErkeley Atmosph

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Gołasa, Piotr, Marcin Wysokiński, Wioletta Bieńkowska-Gołasa, et al. "Sources of Greenhouse Gas Emissions in Agriculture, with Particular Emphasis on Emissions from Energy Used." Energies 14, no. 13 (2021): 3784. http://dx.doi.org/10.3390/en14133784.

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The relationship between agriculture and climate change is two-sided. Agriculture is the branch of the economy most affected by the ongoing processes. It is also a large emitter of greenhouse gases and there are more and more voices about the need to reduce emissions. The purpose of the study was, based on FADN (Farm Accountancy Data Network) data, to determine the structure of greenhouse gas emissions in farms and to identify types of farms where it is possible to reduce GHG (greenhouse gas) emissions through better energy use. The emission volume was determined on the basis of the IPCC (Inte

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Yu, Tai Yi, I. Cheng Chang, Mei Yin Hwa, and Li Teh Lu. "Estimation of Air Pollutant Emissions from Mobile Sources with Three Emission Factors Models." Advanced Materials Research 550-553 (July 2012): 2378–81. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.2378.

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Vehicle emissions from mobile sources are major contributors to air pollution and varied with vehicle types, vehicle styles, traveled miles, temperature, oil types and the methods of operation and management. This study performs three emission factor models, Mobile-Taiwan 2, Mobile6.2 and EFDB to calculate emission factor of mobile sources from year 1986 to 2011. The emissions of primary air pollutants, MIRs and CO2emitted from mobile sources were calculated. The contribution ratios of varied vehicle types for different air pollutants would be compared and analyzed. Estimated emissions from mo

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Ohara, T., H. Akimoto, J. Kurokawa, et al. "An Asian emission inventory of anthropogenic emission sources for the period 1980–2020." Atmospheric Chemistry and Physics Discussions 7, no. 3 (2007): 6843–902. http://dx.doi.org/10.5194/acpd-7-6843-2007.

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Abstract. We developed a new emission inventory for Asia (Regional Emission inventory in ASia (REAS) Version 1.1) for the period 1980–2020. REAS is the first inventory to integrate historical, present, and future emissions in Asia on the basis of a consistent methodology. We present here emissions in 2000, historical emissions for 1980–2003, and projected emissions for 2010 and 2020 of SO2, NOx, CO, NMVOC, black carbon (BC), and organic carbon (OC) from fuel combustion and industrial sources. Total energy consumption in Asia more than doubled between 1980 and 2003, causing a rapid growth in As

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Li, Shaoxian, Ashutosh Sharma, Zsuzsanna Márton, et al. "Subcycle surface electron emission driven by strong-field terahertz waveforms." Nature Communications 14, no. 1 (2023). http://dx.doi.org/10.1038/s41467-023-42316-0.

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AbstractThe advent of intense terahertz (THz) sources opened a new era when the demonstration of the acceleration and manipulation of free electrons by THz pulses became within reach. THz-field-driven electron emission was predicted to be confined to a single burst due to the single-cycle waveform. Here we demonstrate the confinement of single-cycle THz-waveform-driven electron emission to one of the two half cycles from a solid surface emitter. Either the leading or the trailing half cycle was active, controlled by reversing the field polarity. THz-driven single-burst surface electron emissio

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Zhang, Tinglian, Rasmus Ischebeck, Uwe Niedermayer, Thomas Schietinger, and Pavle Juranić. "Boosting the efficiency of narrowband THz radiators via three-dimensional emission collection." Physical Review Accelerators and Beams 28, no. 5 (2025). https://doi.org/10.1103/physrevaccelbeams.28.054501.

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The demand for high-power, narrowband, and tunable THz radiation sources is steadily increasing. Smith-Purcell radiation offers a compact method for resonantly generating narrowband THz sources with notable advantages over other approaches, though the power output still requires improvement. This work introduces a novel 3D emission-collection concept that enhances the efficiency of THz radiators, achieving an enhancement of over an order of magnitude in coherent radiation power compared to the 2D approach. Systematic simulations reveal that the single-layer helically rotated structure, optimiz

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Li, Peiyan, Shaojie Liu, Xinhou Chen, Chunyan Geng, and Xiaojun Wu. "Spintronic terahertz emission with manipulated polarization (STEMP)." Frontiers of Optoelectronics 15, no. 1 (2022). http://dx.doi.org/10.1007/s12200-022-00011-w.

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AbstractHighly efficient generation and arbitrary manipulation of spin-polarized terahertz (THz) radiation will enable chiral lightwave driven quantum nonequilibrium state regulation, induce new electronic structures, consequently provide a powerful experimental tool for investigation of nonlinear THz optics and extreme THz science and applications. THz circular dichromic spectroscopy, ultrafast electron bunch manipulation, as well as THz imaging, sensing, and telecommunication, also need chiral THz waves. Here we review optical generation of circularly-polarized THz radiation but focus on rec

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Huang, Hsin-hui, Saulius Juodkazis, Eugene G. Gamaly, Takeshi Nagashima, Tetsu Yonezawa, and Koji Hatanaka. "Spatio-temporal control of THz emission." Communications Physics 5, no. 1 (2022). http://dx.doi.org/10.1038/s42005-022-00914-2.

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AbstractIntense THz sources are expected for further progresses in nonlinear THz science and technology. Liquids like water are durable and continuously-reusable under intense laser irradiation for THz emission though such studies on THz emission from water targets are so far limited. Polarisation fine control of THz emission is demonstrated with a tilted micro-thin water flow by the irradiation of two cross-linearly-polarised femtosecond laser pulses (800nm, 35fs, transform-limited) with spatio-temporal offsets. With an optimized horizontal offset at ∼11 μm between the ∼8 μm focal spots and t

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Subedi, Sujan, Wenhao Liu, Wuzhang Fang, et al. "Colossal Terahertz Emission with Ultrafast Tunability Based on Van der Waals Ferroelectric NbOI₂." Advanced Optical Materials, February 27, 2025. https://doi.org/10.1002/adom.202403471.

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AbstractTerahertz (THz) technology is critical for quantum material physics, biomedical imaging, ultrafast electronics, and next‐generation wireless communications. However, standing in the way of widespread applications is the scarcity of efficient ultrafast THz sources with on‐demand fast modulation and easy on‐chip integration capability. Here the discovery of colossal THz emission is reported from a van der Waals (vdW) ferroelectric semiconductor NbOI2. Using THz emission spectroscopy, a THz generation efficiency an order of magnitude higher than that of ZnTe, a standard nonlinear crystal

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