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Journal articles on the topic 'THz time domain spectroskopy'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Ciccarelli, Chiara, Hannah Joyce, Jason Robinson, et al. "Terahertz Time-Domain Spectroscopy." Scientific Video Protocols 1, no. 1 (2020): 1–4. http://dx.doi.org/10.32386/scivpro.000006.

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Time-Domain terahertz spectroscopy (THz TDS) has attracted attention from many scientific disciplines as it enables accessing the gap between electronic and optical techniques. One application is to probe spintronic dynamics in sub-picosecond time scale. Here, we discuss principles and technical aspects of a typical THz TDS setup. We also show an example of terahertz time-domain data obtained from a Co/Pt thin film calibrant, which is a well-studied spintronic structure emitting strong THz radiation. See video at https://youtu.be/X7vrvQcmy8c.

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2

Grischkowsky, D., and So/ren Keiding. "THz time‐domain spectroscopy of highTcsubstrates." Applied Physics Letters 57, no. 10 (1990): 1055–57. http://dx.doi.org/10.1063/1.104280.

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3

Cheville, R. Alan. "Perspectives on THz Time Domain Spectroscopy." Journal of the Optical Society of Korea 8, no. 1 (2004): 34–52. http://dx.doi.org/10.3807/josk.2004.8.1.034.

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4

Harde, H., J. Zhao, M. Wolff, R. A. Cheville, and D. Grischkowsky. "THz Time-Domain Spectroscopy on Ammonia." Journal of Physical Chemistry A 105, no. 25 (2001): 6038–47. http://dx.doi.org/10.1021/jp0101099.

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5

Li, Hui Qin, Ji Xian Gong, Jian Fei Zhang, Chang Lei Wang, and Zhen Tian. "Sensing Textile Fibers by THz Time-Domain Spectroscopy." Advanced Materials Research 298 (July 2011): 153–56. http://dx.doi.org/10.4028/www.scientific.net/amr.298.153.

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Along with the booming development of multi-component blending fabrics, the accurate detection of component of fabrics has become a major goal in textile testing. Terahertz sensing technology provides a new way for detecting the materials. THz time-domain spectroscopy (THz-TDS) is a novel spectroscopic technique which measures the electric field of the radiation through a sample and provides the phase and amplitude changes of the radiation, which can provide information unavailable through conventional methods such as microwave and X-ray techniques. In this investigation, THz-TDS technology wa

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6

Chen, Si, Chao Yan, Bin Luo, and Bin Yang. "Study on the Terahertz Time Domain Spectrum of P-Chloroaniline." Advanced Materials Research 441 (January 2012): 741–45. http://dx.doi.org/10.4028/www.scientific.net/amr.441.741.

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P-chloroaniline is one of the most important azo dye intermediates. It is a highly desired research on the identification of P-chloroaniline. Terahertz time domain spectroscopy (THz-TDS) is sensitive to the molecule structure of compound. In this paper, the spectra of P-chloroaniline located at the region from 0.1 to 3 THz were tested by THz-TDS system, and then the geometry structure of p-chloroaniline at the range of 0 THz to 10 THz was optimized, resonance frequency was calculated by Gussian03 software based on the density functional theory (DFT). The results showed that the absorbance peak

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7

Zai-Jun, Xi, Xiao Ti-Qiao, Zhang Zeng-Yan, Yu Xiao-Han, Chen Min, and Xu Hong-Jie. "Outline Imaging by THz Time Domain Spectroscopy." Chinese Physics Letters 23, no. 2 (2006): 352–54. http://dx.doi.org/10.1088/0256-307x/23/2/021.

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8

WANG, Weining. "THz time-domain spectroscopy of amino acids." Chinese Science Bulletin 50, no. 15 (2005): 1561. http://dx.doi.org/10.1360/982005-7.

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9

Pedersen, J. E., and S. R. Keiding. "THz time-domain spectroscopy of nonpolar liquids." IEEE Journal of Quantum Electronics 28, no. 10 (1992): 2518–22. http://dx.doi.org/10.1109/3.159558.

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10

Sasaki, Toru, Yusuke Hashimoto, Tatsuya Mori, and Seiji Kojima. "Broadband Terahertz Time-Domain Spectroscopy of Archaeological Baltic Amber." International Letters of Chemistry, Physics and Astronomy 62 (November 2015): 29–33. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.62.29.

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We performed the broadband terahertz time-domain spectroscopy on archaeological Baltic amber at 40 million years old. We determined the real and imaginary parts of the complex dielectric constants in the frequency range from 0.2 to 6.5 THz. The imaginary part of the complex dielectric constants showed a broad peak at 1.51 THz and a small peak at 4.0 THz. A boson peak, which is the characteristic low energy excitation of a glassy state, was not observed above 0.2 THz even in low temperatures.

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11

Jukam, Nathan, Sukhdeep Dhillon, Zhen-Yu Zhao, et al. "Gain Measurements of THz Quantum Cascade Lasers using THz Time-Domain Spectroscopy." IEEE Journal of Selected Topics in Quantum Electronics 14, no. 2 (2008): 436–42. http://dx.doi.org/10.1109/jstqe.2007.911761.

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12

SHAN, JIE, AJAY NAHATA, and TONY F. HEINZ. "TERAHERTZ TIME-DOMAIN SPECTROSCOPY BASED ON NONLINEAR OPTICS." Journal of Nonlinear Optical Physics & Materials 11, no. 01 (2002): 31–48. http://dx.doi.org/10.1142/s0218863502000845.

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We present a brief review of the use of nonlinear optics for broadband terahertz (THz) time-domain spectroscopy with femtosecond laser pulses. The generation of THz pulses is accomplished by optical rectification and coherent detection by electro-optic sampling or field-induced second-harmonic generation. The approach permits exceptional time response, as well as the possibility for multichannel detection schemes.

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13

Markelz, Andrea, Scott Whitmire, Jay Hillebrecht, and Robert Birge. "THz time domain spectroscopy of biomolecular conformational modes." Physics in Medicine and Biology 47, no. 21 (2002): 3797–805. http://dx.doi.org/10.1088/0031-9155/47/21/318.

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14

Taschin, Andrea, Paolo Bartolini, Jordanka Tasseva, and Renato Torre. "THz time-domain spectroscopic investigations of thin films." Measurement 118 (March 2018): 282–88. http://dx.doi.org/10.1016/j.measurement.2017.05.074.

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15

Moreno, Enrique, Mario Fernandez Pantoja, Salvador G. Garcia, Amelia Rubio Bretones, and Rafael Gomez Martin. "Time-Domain Numerical Modeling of THz Photoconductive Antennas." IEEE Transactions on Terahertz Science and Technology 4, no. 4 (2014): 490–500. http://dx.doi.org/10.1109/tthz.2014.2327385.

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16

Kambara, Ohki, and Keisuke Tominaga. "Structural fluctuation of proteins revealed by terahertz time-domain spectroscopy." Spectroscopy 24, no. 1-2 (2010): 149–52. http://dx.doi.org/10.1155/2010/391586.

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We have measured spectra of the absorption coefficient and refractive index of hen egg white lysozyme in the wavenumber region from 7 cm–1to 50 cm–1by terahertz (THz) time-domain spectroscopy. From comparison with the results of the inelastic neutron scattering experiment it is concluded that analysis of the THz spectra provides information on the vibrational density of states. We studied temperature dependence of the THz spectra as well as hydration effect on them to discuss structural fluctuation of the protein. We observed dynamical transition at around 210 K for lysozyme.

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17

Zhao, Hui, Kun Zhao, and Rima Bao. "Predicting Cold Flow Properties of Diesel by Terahertz Time-Domain Spectroscopy." ISRN Spectroscopy 2012 (April 9, 2012): 1–4. http://dx.doi.org/10.5402/2012/876718.

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The frequency-dependent absorption characteristics of conventional diesel fuel have been researched in the spectral range of 0.2–1.5 THz by the terahertz time-domain spectroscopy (THz-TDS). The absorption coefficient increased monotonically with the solidifying point of diesel. A nonlinear regression model was established, and the cold flow properties of fuel were presented quantitatively. The results made the solidifying point prediction possible by THz-TDS technology and indicated the bright future in practical application.

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18

D’Angelo, Francesco, Zoltán Mics, Mischa Bonn, and Dmitry Turchinovich. "Ultra-broadband THz time-domain spectroscopy of common polymers using THz air photonics." Optics Express 22, no. 10 (2014): 12475. http://dx.doi.org/10.1364/oe.22.012475.

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19

Liu, Zhe, Xian Li, Fei Heng Yue, et al. "Research of Beta-Endosulfan Based on THz Time-Domain Spectroscopy." Advanced Materials Research 718-720 (July 2013): 1060–65. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.1060.

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THz spectral properties between 0.2-1.5THz of beta-endosulfan, one of the persistent organic pollutants (POPs), are investigated based on the THz time domain system. Part of the characteristic absorption peaks are theoretically analyzed by Dmol3 modular program. The experimental results show that the average refractive index of beta-endosulfan in the THz waveband is about 1.005 and characteristic absorption peaks exist at 0.67, 0.80, 1.03, 1.14, 1.26 and 1.46THz. The absorption peaks at 0.67THz and 1.03THz have a good match with the theoretic absorption peak positions which appear at 0.72THz a

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20

Kohlhaas, Robert B., Lars Liebermeister, Steffen Breuer, et al. "Fiber Coupled Transceiver with 6.5 THz Bandwidth for Terahertz Time-Domain Spectroscopy in Reflection Geometry." Sensors 20, no. 9 (2020): 2616. http://dx.doi.org/10.3390/s20092616.

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We present a fiber coupled transceiver head for terahertz (THz) time-domain reflection measurements. The monolithically integrated transceiver chip is based on iron (Fe) doped In0.53Ga0.47As (InGaAs:Fe) grown by molecular beam epitaxy. Due to its ultrashort electron lifetime and high mobility, InGaAs:Fe is very well suited as both THz emitter and receiver. A record THz bandwidth of 6.5 THz and a peak dynamic range of up to 75 dB are achieved. In addition, we present THz imaging in reflection geometry with a spatial resolution as good as 130 µm. Hence, this THz transceiver is a promising device

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21

ZIMDARS, DAVID, JEFFREY WHITE, G. STUK, G. SUCHA, G. FICHTER, and S. L. WILLIAMSON. "TIME DOMAIN TERAHERTZ IMAGING OF THREATS IN LUGGAGE AND PERSONNEL." International Journal of High Speed Electronics and Systems 17, no. 02 (2007): 271–81. http://dx.doi.org/10.1142/s0129156407004497.

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We demonstrate a large area time domain terahertz (THz) imaging system capable of scanning 1 meter square area in less than 20-100 minutes for several security applications. The detection of concealed explosives; metallic and non-metallic weapons (such as ceramic, plastic or composite guns and knives); and flammables in luggage, packages and personnel has been demonstrated. Transmission mode images of luggage containing threat items are discussed. Reflection mode images of luggage and personnel are discussed. Time domain THz images can be analyzed for 3 dimensional and volumetric information.

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22

Nedelcu, Liviu, Cezar Dragos Geambasu, Monica Enculescu, and Marian Gabriel Banciu. "Intrinsic Dielectric Loss in Zr0.8Sn0.2TiO4 Ceramics Investigated by Terahertz Time Domain Spectroscopy." Materials 14, no. 1 (2021): 216. http://dx.doi.org/10.3390/ma14010216.

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Terahertz time-domain spectroscopy (THz-TDS) was employed for estimation of intrinsic dielectric loss of Zr0.8Sn0.2TiO4 (ZST) ceramics. Single-phase ZST dielectric resonators (DRs) with various synthesis parameters and, consequently, different extrinsic losses, were prepared by conventional ceramic technology. Even though the DRs exhibit a similar microstructure, their quality factor (Q is the inverse of dielectric loss tangent) measured in microwave (MW) domain at 6 GHz varies between 2500 and 8400. On the other hand, it was found that the THz dielectric loss is less sensitive to the sample p

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23

Koda, Shota, Tatsuya Mori, and Seiji Kojima. "Broadband Terahertz Time-Domain Spectroscopy and Low-Frequency Raman Scattering of Propylene Glycol." International Letters of Chemistry, Physics and Astronomy 62 (November 2015): 15–20. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.62.15.

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Two different THz-TDS systems were used for the accurate study of broadband terahertz dynamics between 0.1 and 5.0 THz. These systems enabled to observe the whole spectral structure of the broad peak at 1.5 THz in propylene glycol. At high-frequency side of the broad peak in the dielectric spectrum, the small shoulder peak at 3.6 THz was also observed. It is assigned to the inter-molecular vibration, which is supported by the precedent report and the Gaussian calculation. In contrast, the low-frequency side of the broad peak includes the contribution of the relaxation processes which exist in

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24

Wang, Liang, Chao Tang, Shiping Zhu, and Shengling Zhou. "Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals." Materials 11, no. 11 (2018): 2124. http://dx.doi.org/10.3390/ma11112124.

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An accelerated thermal aging process was used to simulate the condition of paper insulation in transformer oil-paper systems. Optical parameters of the insulation paper after various aging intervals were analyzed with terahertz time-domain spectroscopy (THz-TDS) over the range 0.1~1.8 THz. The result shows that the paper had seven absorption peaks at 0.19, 0.49, 0.82, 1.19, 1.43, 1.53, and 1.74 THz, and density functional theory of B3LYP/6-311G+ (d, p) was used to simulate the molecular dynamics of the repeating component (cellobiose) of the cellulose paper. Theoretical spectra were consistent

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25

Abdul-Munaim, Ali, Jan Ornik, Martin Koch, and Dennis Watson. "Terahertz Time Domain Spectroscopy to Detect Different Oxidation Levels of Diesel Engine Oil." Lubricants 7, no. 2 (2019): 18. http://dx.doi.org/10.3390/lubricants7020018.

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Diesel engine oil was subjected to thermal oxidization (TO) for six periods of time (0 h, 24 h, 48 h, 72 h, 96 h, and 120 h) and was subsequently characterized by terahertz time domain spectroscopy (THz-TDS). The THz refractive index generally increased with oxidation time. The measurement method illustrated the potential of THz-TDS when a fixed setup with a single cuvette is used. A future miniaturized setup installed in an engine would be an example of a fixed setup. For the refractive index, there were highly significant differences among the oxidation times across most of the 0.3–1.7 THz r

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26

Zhao Lijun, 赵丽君, 高磊 Gao Lei, 姜晨 Jiang Chen, 衣玲学 Yi Lingxue, 于宪书 Yu Xianshu, and 赵昆 Zhao Kun. "Determination of Dibutyl Phthalate with THz Time-Domain Spectroscopy." Acta Optica Sinica 35, s1 (2015): s130001. http://dx.doi.org/10.3788/aos201535.s130001.

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27

Causa, Federica, Marco Zerbini, Michael Johnston, et al. "FTU Diagnostic System Based on THz Time-domain Spectroscopy." Physics Procedia 62 (2015): 65–70. http://dx.doi.org/10.1016/j.phpro.2015.02.012.

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28

Wilk, Rafal, Ioachin Pupeza, Radu Cernat, and Martin Koch. "Highly Accurate THz Time-Domain Spectroscopy of Multilayer Structures." IEEE Journal of Selected Topics in Quantum Electronics 14, no. 2 (2008): 392–98. http://dx.doi.org/10.1109/jstqe.2007.910981.

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29

Ljubenovic, Marina, Lina Zhuang, Jan De Beenhouwer, and Jan Sijbers. "Joint Deblurring and Denoising of THz Time-Domain Images." IEEE Access 9 (2021): 162–76. http://dx.doi.org/10.1109/access.2020.3045605.

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30

Arcos, David, Daniel Gabriel, Dumitru Dumcenco, Andras Kis, and Núria Ferrer-Anglada. "THz time-domain spectroscopy and IR spectroscopy on MoS2." physica status solidi (b) 253, no. 12 (2016): 2499–504. http://dx.doi.org/10.1002/pssb.201600281.

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31

Oh-e, Masahito, Hiroshi Yokoyama, Mattijs Koeberg, Euan Hendry, and Mischa Bonn. "Liquid Crystal Colloids Studied by THz Time-Domain Spectroscopy." Molecular Crystals and Liquid Crystals 480, no. 1 (2008): 21–28. http://dx.doi.org/10.1080/15421400701821317.

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32

Jung, Euna, Hongkyu Park, Kiwon Moon, et al. "THz Time-Domain Spectroscopic Imaging of Human Articular Cartilage." Journal of Infrared, Millimeter, and Terahertz Waves 33, no. 6 (2012): 593–98. http://dx.doi.org/10.1007/s10762-012-9903-0.

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33

Katzenellenbogen, N., and D. Grischkowsky. "Electrical characterization to 4 THz ofN‐ andP‐type GaAs using THz time‐domain spectroscopy." Applied Physics Letters 61, no. 7 (1992): 840–42. http://dx.doi.org/10.1063/1.107762.

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34

OSIANDER, ROBERT, MICHAEL J. FITCH, MEGAN LEAHY-HOPPA, YAMAC DIKMELIK, and JAMES B. SPICER. "SIGNATURE AND SIGNAL GENERATION ASPECTS OF EXPLOSIVE DETECTION USING TERAHERTZ TIME-DOMAIN SPECTROSCOPY." International Journal of High Speed Electronics and Systems 18, no. 02 (2008): 295–306. http://dx.doi.org/10.1142/s0129156408005357.

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In the last few years, a number of researchers including our collaboration have assembled databases of terahertz (THz) time-domain spectroscopy (TDS) absorption spectra from bulk explosives. While this was a necessary and important step in demonstrating the feasibility of THz TDS for explosives detection, the goal of our research is to demonstrate selectivity of THz spectra from the clutter of background spectra coming from the substrate such as soil or sand. We have investigated THz TDS reflection spectra from sand with different grain sizes as well as from metallic powders in order to distin

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35

Qi, Liang, Linas Minkevičius, Andrzej Urbanowicz, et al. "Antenna-Coupled Titanium Microbolometers: Application for Precise Control of Radiation Patterns in Terahertz Time-Domain Systems." Sensors 21, no. 10 (2021): 3510. http://dx.doi.org/10.3390/s21103510.

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An ability of lensless titanium-based antenna coupled microbolometers (Ti-μbolometers) operating at room temperature to monitor precisely radiation patterns in terahertz time-domain spectroscopy (THz-TDS) systems are demonstrated. To provide comprehensive picture, two different THz-TDS systems and Ti-μbolometers coupled with three different antennas—narrowband dipole antennas for 0.3 THz, 0.7 THz and a log-periodic antenna for wideband detection—were selected for experiments. Radiation patterns, spatial beam profiles and explicit beam evolution along the propagation axis are investigated; pola

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36

Inagaki, Tetsuya, Ian D. Hartley, Satoru Tsuchikawa, and Matthew Reid. "Prediction of oven-dry density of wood by time-domain terahertz spectroscopy." Holzforschung 68, no. 1 (2014): 61–68. http://dx.doi.org/10.1515/hf-2013-0013.

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Abstract Wood is relatively transparent to terahertz (THz) radiation with wavelengths in the submillimeter range. This radiation has a high potential for sensing and imaging wood with a good spatial resolution. THz is especially sensitive to moisture content, fiber alignment, and density – all of which are critical in the manufacturing of wood products. In this work, a systematic study was undertaken on 46 very different wood species by means of THz time-domain spectroscopy with density determination in focus. The dielectric response of wood was modeled based on the Maxwell-Garnett effective m

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37

Huang, Yi Hu, Man Hu, Gui Hua He, and Wen Long Liu. "Terahertz Time-Domain Spectroscopy Technology and its Application in the Field of Pesticide." Key Engineering Materials 561 (July 2013): 640–45. http://dx.doi.org/10.4028/www.scientific.net/kem.561.640.

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Terahertz wave lies between far-infrared and microwave in electromagnetic spectrum with frequency form 0.1 THz to10 THz. Terahertz is believed to be the master technology of electronics and information science, and to be the bridge between micro electronics and macro wavelength. THz has formed a worldwide research climax. This paper introduces the main characters of Terahertz wave, Terahertz time-domain spectroscopy technology and its application researches, especially detailed the researches in pesticide spectra.

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38

Kawaguchi, Shintaro, Ohki Kambara, Carlito S. Ponseca Jr., Mikihiro Shibata, Hideki Kandori, and Keisuke Tominaga. "Low-frequency dynamics of biological molecules studied by terahertz time-domain spectroscopy." Spectroscopy 24, no. 1-2 (2010): 153–58. http://dx.doi.org/10.1155/2010/536453.

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By terahertz (THz) time-domain spectroscopy we have measured low-frequency spectra of amino acid (glycine; Gly), short peptides ((Gly)3and (Gly)4), six globular proteins and bacteriorhodopsin (BR). From the analysis of the THz spectra we defined and obtained the reduced absorption cross sections for these cases, which are proportional to the vibrational density of states. We observed anharmonic behaviors in the low-frequency modes of the short peptides. The globular proteins we investigated show a universal feature in the low-frequency spectra. BR shows the dynamical transition in the temperat

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39

Cacciari, Ciofini, Baija, and Siano. "Terahertz Time-Domain Reconstruction of Coating Microstratigraphy on Gilded Surfaces." Materials 12, no. 23 (2019): 3822. http://dx.doi.org/10.3390/ma12233822.

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Here, a systematic study in order to assess the potential of THz time domain reflectometry for measuring the thicknesses of overpaint layers applied on original gilded surfaces was carried out. The work is part of a thorough characterization campaign, which is going on at the Rijksmuseum for addressing the conservation problems of a set of 19th century gilded picture frames on which heavy coatings were applied in previous undocumented restoration interventions. To perform such non-invasive thickness measurements, an analytical protocol based on Gaussian fits of the THz pulse-echo temporal prof

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40

Li, Xiangjun, Zhi Hong, Jinlong He, and Yuquan Chen. "Precisely optical material parameter determination by time domain waveform rebuilding with THz time-domain spectroscopy." Optics Communications 283, no. 23 (2010): 4701–6. http://dx.doi.org/10.1016/j.optcom.2010.06.088.

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41

Tasseva, J., A. Taschin, P. Bartolini, J. Striova, R. Fontana, and R. Torre. "Thin layered drawing media probed by THz time-domain spectroscopy." Analyst 142, no. 1 (2017): 42–47. http://dx.doi.org/10.1039/c6an02113a.

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42

Laman, N., S. Sree Harsha, and D. Grischkowsky. "Narrow-Line Waveguide Terahertz Time-Domain Spectroscopy of Aspirin and Aspirin Precursors." Applied Spectroscopy 62, no. 3 (2008): 319–26. http://dx.doi.org/10.1366/000370208783759768.

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Low frequency vibrational modes of pharmaceutical molecules are dependent on the molecule as a whole and can be used for identification purposes. However, conventional Fourier transform far-infrared spectroscopy (FT-IR) and terahertz time-domain spectroscopy (THz-TDS) often result in broad, overlapping features that are difficult to distinguish. The technique of waveguide THz-TDS has been recently developed, resulting in sharper spectral features. Waveguide THz-TDS consists of forming an ordered polycrystalline film on a metal plate and incorporating that plate in a parallel-plate waveguide, w

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43

Koroliov, Anton, Genyu Chen, Kenneth M. Goodfellow, et al. "Terahertz Time-Domain Spectroscopy of Graphene Nanoflakes Embedded in Polymer Matrix." Applied Sciences 9, no. 3 (2019): 391. http://dx.doi.org/10.3390/app9030391.

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The terahertz time-domain spectroscopy (THz-TDS) technique has been used to obtain transmission THz-radiation spectra of polymer nanocomposites containing a controlled amount of exfoliated graphene. Graphene nanocomposites (1 wt%) that were used in this work were based on poly(ethylene terephthalate-ethylene dilinoleate) (PET-DLA) matrix and were prepared via a kilo-scale (suitable for research and development, and prototyping) in-situ polymerization. This was followed by compression molding into 0.3-mm-thick and 0.9-mm-thick foils. Transmission electron microscopy (TEM) and Raman studies were

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44

Zhou, Zhi Long, Xiai Chen, Lu Han, Qing Hua Zhang, and Xian Li. "The Study of Terahertz Time-Domain Spectroscopy of Benzoyl Peroxide." Applied Mechanics and Materials 633-634 (September 2014): 521–25. http://dx.doi.org/10.4028/www.scientific.net/amm.633-634.521.

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The spectral characteristics of benzoyl peroxide in the range of 0.3 to 1.6 in THz region is obtained by THz time-domain spectroscopy, the refraction and absorption spectra of benzoyl peroxide is got,meanwhile. The experimental result shows that, the benzoyl peroxide has the absorption peak at the wave band of 0.36621THz,0.498THz,0.92285THz,1.11328THz, the most obvious of which is at the wave band of 0.92285THz.The terahertz absorption spectra of the mixture of flour and benzoyl peroxide is studied at the same time.This experimental study provides a new method to detect benzoyl peroxide illega

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45

Mamrashev, Alexander, Fedor Minakov, Nazar Nikolaev, and Valery Antsygin. "Terahertz Time-Domain Polarimetry for Principal Optical Axes of Anisotropic Crystals." Photonics 8, no. 6 (2021): 213. http://dx.doi.org/10.3390/photonics8060213.

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We propose a method for measuring the terahertz properties for two principal optical axes of anisotropic crystals without optical activity using terahertz time-domain spectroscopy (THz-TDS). The method put forward in this paper utilizes the inherent polarization sensitivity of the THz-TDS electro-optic detection system. We demonstrate the practical application of the method by measuring the temperature dependence of the refractive index and the absorption coefficient of a lithium triborate crystal for three optical axes.

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Ye, Hai-Mu, Han Li, and Shu-Fang Yao. "Characterizing the Structure and Phase Transformation of Poly(ethylene Oxide)–Urea Complexes Using Terahertz Time-Domain Spectroscopy." Applied Spectroscopy 71, no. 11 (2017): 2549–54. http://dx.doi.org/10.1177/0003702817722573.

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Terahertz time-domain spectroscopy (THz-TDS) was employed to characterize the structure and α→β phase transformation of poly(ethylene oxide) (PEO)–urea complexes. While the THz responses of α- and β-form complexes are both originated from hydrogen bonding interactions, they possess different THz absorption bands. The α-form PEO–urea complex shows two bands at 1.12 and 1.24 THz, which are vibration modes due to the hydrogen bonding among urea and between PEO and urea, respectively; the β-form PEO–urea complex shows a band at 1.48 THz, which is a vibration mode due to the hydrogen bonding among

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Chen, Tao, Zhi Li, Fang Rong Hu, and Wei Mo. "Quantitative Analysis of Mixtures Using Terahertz Time-Domain Spectroscopy and Different PLS Algorithms." Advanced Materials Research 804 (September 2013): 23–28. http://dx.doi.org/10.4028/www.scientific.net/amr.804.23.

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This paper attempted the feasibility to determine component concentrations in multicomponent mixtures with terahertz time-domain spectroscopy (THz-TDS) combined with different partial least-squares regression (PLS) algorithms. First, THz absorbance spectra for 75 ternary mixtures of anhydrous theophylline, lactose monohydrate and magnesium stearate were investigated using THz-TDS in the frequency range from 0.1 to 3.0 THz, then four different PLS methods, including interval PLS (iPLS), backward interval PLS (biPLS), synergy interval PLS (siPLS) and moving window PLS (mwPLS), were employed to p

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Yu-Feng, SONG, ZHU Zhi-Yong, JI Te, GE Min, CHEN Xi-Liang, and LIU Qi. "THz time-domain spectroscopic study of polyethylene-carbon black composites." Acta Physico-Chimica Sinica 23, no. 02 (2007): 177–80. http://dx.doi.org/10.3866/pku.whxb20070208.

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Missori, M., D. Pawcenis, J. Bagniuk, et al. "Quantitative diagnostics of ancient paper using THz time-domain spectroscopy." Microchemical Journal 142 (November 2018): 54–61. http://dx.doi.org/10.1016/j.microc.2018.06.010.

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Le Boiteux, Sylvie, Natalia Del Fatti, Inka Manek-Hönninger, and Laurent Sarger. "THz-Time Domain Spectroscopy system for applications to radical detection." Comptes Rendus de l'Académie des Sciences - Series IV - Physics 2, no. 7 (2001): 983–88. http://dx.doi.org/10.1016/s1296-2147(01)01244-6.

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