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Journal articles on the topic 'THz near field'

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Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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1

Niessen, Katherine, Yanting Deng, and A. G. Markelz. "Near-field THz micropolarimetry." Optics Express 27, no. 20 (September 18, 2019): 28036. http://dx.doi.org/10.1364/oe.27.028036.

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2

Hunsche, S., M. Koch, I. Brener, and M. C. Nuss. "THz near-field imaging." Optics Communications 150, no. 1-6 (May 1998): 22–26. http://dx.doi.org/10.1016/s0030-4018(98)00044-3.

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3

von Ribbeck, H. G., M. Brehm, D. W. van der Weide, S. Winnerl, O. Drachenko, M. Helm, and F. Keilmann. "Spectroscopic THz near-field microscope." Optics Express 16, no. 5 (2008): 3430. http://dx.doi.org/10.1364/oe.16.003430.

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4

Lee, Dong-Kyu, Giyoung Kim, Chulki Kim, Young Min Jhon, Jae Hun Kim, Taikjin Lee, Joo-Hiuk Son, and Minah Seo. "Ultrasensitive Detection of Residual Pesticides Using THz Near-Field Enhancement." IEEE Transactions on Terahertz Science and Technology 6, no. 3 (May 2016): 389–95. http://dx.doi.org/10.1109/tthz.2016.2538731.

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5

Schade, U., K. Holldack, P. Kuske, G. Wüstefeld, and H. W. Hübers. "THz near-field imaging employing synchrotron radiation." Applied Physics Letters 84, no. 8 (February 23, 2004): 1422–24. http://dx.doi.org/10.1063/1.1650034.

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6

Adam, Aurèle J. L., Janne M. Brok, Paul C. M. Planken, Min Ah Seo, and Dai Sik Kim. "THz near-field measurements of metal structures." Comptes Rendus Physique 9, no. 2 (March 2008): 161–68. http://dx.doi.org/10.1016/j.crhy.2007.07.005.

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7

Stantchev, Rayko I., David B. Phillips, Peter Hobson, Samuel M. Hornett, Miles J. Padgett, and Euan Hendry. "Compressed sensing with near-field THz radiation." Optica 4, no. 8 (August 17, 2017): 989. http://dx.doi.org/10.1364/optica.4.000989.

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8

Junkin, Gary. "PHASE SHIFTING HOLOGRAPHY FOR THZ NEAR-FIELD/FAR-FIELD PREDICTION." Progress In Electromagnetics Research Letters 44 (2014): 15–21. http://dx.doi.org/10.2528/pierl13093006.

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9

Yang, Zhongbo, Dongyun Tang, Jiao Hu, Mingjie Tang, Mingkun Zhang, Hong‐Liang Cui, Lihua Wang, et al. "THz Near‐Field Imaging: Near‐Field Nanoscopic Terahertz Imaging of Single Proteins (Small 3/2021)." Small 17, no. 3 (January 2021): 2170008. http://dx.doi.org/10.1002/smll.202170008.

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10

Kumar, Nishant, Andrew C. Strikwerda, Kebin Fan, Xin Zhang, Richard D. Averitt, Paul C. M. Planken, and Aurèle J. L. Adam. "THz near-field Faraday imaging in hybrid metamaterials." Optics Express 20, no. 10 (May 2, 2012): 11277. http://dx.doi.org/10.1364/oe.20.011277.

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11

Wimmer, Lara, Benjamin Schröder, Murat Sivis, Georg Herink, and Claus Ropers. "Clocking plasmon nanofocusing by THz near-field streaking." Applied Physics Letters 111, no. 13 (September 25, 2017): 131102. http://dx.doi.org/10.1063/1.4991860.

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12

Tong, C. Y. E., D. V. Meledin, D. P. Marrone, S. N. Paine, H. Gibson, and R. Blundell. "Near field vector beam measurements at 1 THz." IEEE Microwave and Wireless Components Letters 13, no. 6 (June 2003): 235–37. http://dx.doi.org/10.1109/lmwc.2003.814602.

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13

Kehr, Susanne C., Jonathan Döring, Michael Gensch, Manfred Helm, and Lukas M. Eng. "FEL-Based Near-Field Infrared to THz Nanoscopy." Synchrotron Radiation News 30, no. 4 (July 4, 2017): 31–35. http://dx.doi.org/10.1080/08940886.2017.1338421.

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14

Szelc, Jędrzej, and Harvey Rutt. "Near-Field THz Imaging and Spectroscopy Using a Multiple Subwavelength Aperture Modulator." IEEE Transactions on Terahertz Science and Technology 3, no. 2 (March 2013): 165–71. http://dx.doi.org/10.1109/tthz.2012.2232812.

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15

Gonzalez, Alvaro, Yasunori Fujii, Takafumi Kojima, and Shin'ichiro Asayama. "Reconfigurable Near-Field Beam Pattern Measurement System From 0.03 to 1.6 THz." IEEE Transactions on Terahertz Science and Technology 6, no. 2 (March 2016): 300–305. http://dx.doi.org/10.1109/tthz.2016.2526643.

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16

Mitrofanov, O., M. Lee, J. W. P. Hsu, I. Brener, R. Harel, J. F. Federici, J. D. Wynn, L. N. Pfeiffer, and K. W. West. "Collection-mode near-field imaging with 0.5-THz pulses." IEEE Journal of Selected Topics in Quantum Electronics 7, no. 4 (2001): 600–607. http://dx.doi.org/10.1109/2944.974231.

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17

Lecaque, Romain, Samuel Grésillon, Nicolas Barbey, Romain Peretti, Jean-Claude Rivoal, and Claude Boccara. "THz near-field optical imaging by a local source." Optics Communications 262, no. 1 (June 2006): 125–28. http://dx.doi.org/10.1016/j.optcom.2005.12.054.

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18

Chen, Xinzhong, Xiao Liu, Xiangdong Guo, Shu Chen, Hai Hu, Elizaveta Nikulina, Xinlin Ye, et al. "THz Near-Field Imaging of Extreme Subwavelength Metal Structures." ACS Photonics 7, no. 3 (January 29, 2020): 687–94. http://dx.doi.org/10.1021/acsphotonics.9b01534.

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19

Xiao, Luyin, Yongjun Xie, Shida Gao, Junbao Li, and Peiyu Wu. "Generalized Radar Range Equation Applied to the Whole Field Region." Sensors 22, no. 12 (June 18, 2022): 4608. http://dx.doi.org/10.3390/s22124608.

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Most terahertz (THz) radar systems can only work in the near-field region, because the THz source power is limited and the size of the target scattered near field is up to tens of kilometers. Such conditions will result in the conventional radar range equation being unsuitable. Therefore, the near-field radar cross section (RCS) formula is given according to the numerical simulation on different targets. By modifying the parameters in the near field, including the gain of radar antennas and the RCS of targets, the generalized radar range equation is proposed. The THz radar working efficiency in the whole range and the simulation of the near-field RCS simulation model were employed to validate its effectiveness. Through comparison with the radar range equation, it can be concluded that the calculation results of the proposed equation are smaller in the near field, and the outcomes in the far field are identical. The proposed generalized radar range equation can be applied to the whole radiation area including the near field and the far field. Furthermore, more complicated real targets are calculated according to the generalized radar range equation and it can be extended from the submillimeter wave band to a much wider band range. Finally, the near-field radar theory is established, which shows its potential application to the radar cross section estimation in the extremely high frequency and fine design of THz radar systems.
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20

Al-Naib, Ibraheem, Christian Jansen, Ranjan Singh, Markus Walther, and Martin Koch. "Novel THz Metamaterial Designs: From Near- and Far-Field Coupling to High-Q Resonances." IEEE Transactions on Terahertz Science and Technology 3, no. 6 (November 2013): 772–82. http://dx.doi.org/10.1109/tthz.2013.2284856.

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21

Yoshioka, Katsumasa, Ikufumi Katayama, Yusuke Arashida, Atsuhiko Ban, Yoichi Kawada, Hironori Takahashi, and Jun Takeda. "Sub-cycle Manipulation of Electrons in a Tunnel Junction with Phase-controlled Single-cycle THz Near-fields." EPJ Web of Conferences 205 (2019): 08007. http://dx.doi.org/10.1051/epjconf/201920508007.

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By utilizing terahertz scanning tunneling microscopy (THz-STM) with a carrier envelope phase shifter for broadband THz pulses, we could successfully control the near-field-mediated electron dynamics in a tunnel junction with sub-cycle precision. Measurements of the phase-resolved sub-cycle electron tunneling dynamics revealed an unexpected large carrier-envelope phase shift between far-field and near-field single-cycle THz waveforms.
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22

Junkin, Gary. "Planar Near-Field Phase Retrieval Using GPUs for Accurate THz Far-Field Prediction." IEEE Transactions on Antennas and Propagation 61, no. 4 (April 2013): 1763–76. http://dx.doi.org/10.1109/tap.2012.2220324.

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23

Camacho, Miguel, Rafael R. Boix, Sergei A. Kuznetsov, Miguel Beruete, and Miguel Navarro-Cia. "Far-Field and Near-Field Physics of Extraordinary THz Transmitting Hole-Array Antennas." IEEE Transactions on Antennas and Propagation 67, no. 9 (September 2019): 6029–38. http://dx.doi.org/10.1109/tap.2019.2920262.

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24

Capozzoli, Amedeo, Claudio Curcio, and Angelo Liseno. "On the Optimal Field Sensing in Near-Field Characterization." Sensors 21, no. 13 (June 29, 2021): 4460. http://dx.doi.org/10.3390/s21134460.

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We deal with the problem of characterizing a source or scatterer from electromagnetic radiated or scattered field measurements. The problem refers to the amplitude and phase measurements which has applications also to interferometric approaches at optical frequencies. From low frequencies (microwaves) to high frequencies or optics, application examples are near-field/far-field transformations, object restoration from measurements within a pupil, near-field THz imaging, optical coherence tomography and ptychography. When analyzing the transmitting-sensing system, we can define “optimal virtual” sensors by using the Singular Value Decomposition (SVD) approach which has been, since long time, recognized as the “optimal” tool to manage linear algebraic problems. The problem however emerges of discretizing the relevant singular functions, thus defining the field sampling. To this end, we have recently developed an approach based on the Singular Value Optimization (SVO) technique. To make the “virtual” sensors physically realizable, in this paper, two approaches are considered: casting the “virtual” field sensors into arrays reaching the same performance of the “virtual” ones; operating a segmentation of the receiver. Concerning the array case, two ways are followed: synthesize the array by a generalized Gaussian quadrature discretizing the linear reception functionals and use elementary sensors according to SVO. We show that SVO is “optimal” in the sense that it leads to the use of elementary, non-uniformly located field sensors having the same performance of the “virtual” sensors and that generalized Gaussian quadrature has essentially the same performance.
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25

SAKUMA, Ryoko, Kuan-Ting LIN, Sunmi KIM, Fuminobu KIMURA, and Yusuke KAJIHARA. "THz spectroscopic near-field measurement for nanoscale thermal evanescent waves." Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2021.10 (2021): 036–03. http://dx.doi.org/10.1299/jsmelem.2021.10.036-003.

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26

Eng, Lukas M., Frederik Kuschewski, Jonathan Döring, Lukas Wehmeier, Tobias Nörenberg, Thales de Oliveira, Hans-Georg von Ribbeck, et al. "Near-Field THz Nanoscopy with Novel Accelerator-Based Photon Sources." Proceedings 26, no. 1 (September 5, 2019): 1. http://dx.doi.org/10.3390/proceedings2019026001.

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27

Kawano, Yukio. "Highly Sensitive Detector for On-Chip Near-Field THz Imaging." IEEE Journal of Selected Topics in Quantum Electronics 17, no. 1 (January 2011): 67–78. http://dx.doi.org/10.1109/jstqe.2010.2047714.

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28

Brendel, Christian, Jan M. Scholtyssek, Frank Ludwig, and Meinhard Schilling. "HTS Josephson Junction Cantilever With Integrated Near Field THz Antenna." IEEE Transactions on Applied Superconductivity 21, no. 3 (June 2011): 319–22. http://dx.doi.org/10.1109/tasc.2010.2096452.

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29

Kajihara, Yusuke, Takehiro Mizutani, and Susumu Komiyama. "Passive THz Near-Field Imaging and its Applications for Engineering." Key Engineering Materials 523-524 (November 2012): 821–25. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.821.

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We have recently developed a THz near-field microscope with an ultrahighly sensitive detector, CSIP (charge-sensitive infrared phototransistor). The microscope probes spontaneous evanescent field on samples derived from local phenomena and the signal origin from metals was previously revealed to be thermal charge/current fluctuations. The intensity of passive near-field signal is very well consistent with Bose-Einstein distribution, which corresponds to the sample temperature. In this study, we demonstrate nano-thermometry with the microscope by monitoring passive near-field signals on a biased NiCr pattern. The obtained signals correspond to the local temperature and the result shows that the inner side of the line curve is much brighter than outer side. It can be easily interpreted by Kirchhoff’s law. The spatial resolution is 60 nm, which cannot be experimentally achieved by any other optical thermometry. This demonstration strongly suggests that our microscope is very well suited for real-time temperature mapping of complicated circuit patterns, and others like bio-samples.
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30

Stantchev, Rayko Ivanov, Baoqing Sun, Sam M. Hornett, Peter A. Hobson, Graham M. Gibson, Miles J. Padgett, and Euan Hendry. "Noninvasive, near-field terahertz imaging of hidden objects using a single-pixel detector." Science Advances 2, no. 6 (June 2016): e1600190. http://dx.doi.org/10.1126/sciadv.1600190.

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Terahertz (THz) imaging can see through otherwise opaque materials. However, because of the long wavelengths of THz radiation (λ = 400 μm at 0.75 THz), far-field THz imaging techniques suffer from low resolution compared to visible wavelengths. We demonstrate noninvasive, near-field THz imaging with subwavelength resolution. We project a time-varying, intense (>100 μJ/cm2) optical pattern onto a silicon wafer, which spatially modulates the transmission of synchronous pulse of THz radiation. An unknown object is placed on the hidden side of the silicon, and the far-field THz transmission corresponding to each mask is recorded by a single-element detector. Knowledge of the patterns and of the corresponding detector signal are combined to give an image of the object. Using this technique, we image a printed circuit board on the underside of a 115-μm-thick silicon wafer with ~100-μm (λ/4) resolution. With subwavelength resolution and the inherent sensitivity to local conductivity, it is possible to detect fissures in the circuitry wiring of a few micrometers in size. THz imaging systems of this type will have other uses too, where noninvasive measurement or imaging of concealed structures is necessary, such as in semiconductor manufacturing or in ex vivo bioimaging.
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31

Stewing, Felix, Christian Brendel, and Meinhard Schilling. "Three dimensional near-field radiation imaging up to the THz-regime." Frequenz 62, no. 5-6 (June 1, 2008): 149–52. http://dx.doi.org/10.1515/freq.2008.62.5-6.149.

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32

Pizzuto, Angela, Xinzhong Chen, Hai Hu, Qing Dai, Mengkun Liu, and Daniel M. Mittleman. "Anomalous contrast in broadband THz near-field imaging of gold microstructures." Optics Express 29, no. 10 (May 3, 2021): 15190. http://dx.doi.org/10.1364/oe.423528.

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33

Cao, L. H., Wei Yu, M. Y. Yu, and C. Y. Yu. "Terahertz Radiation from a Plasma Cylinder with External Radial Electric and Axial Magnetic Fields." Laser and Particle Beams 2021 (January 29, 2021): 1–6. http://dx.doi.org/10.1155/2021/6666760.

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Terahertz (THz) radiation from a plasma cylinder with embedded radial electric and axial magnetic fields is investigated. The plasma density and the electric and magnetic fields are such that the electron plasma frequency is near the electron cyclotron frequency and in the THz regime. Two-dimensional particle-in-cell simulations show that the plasma electrons oscillate not only in the azimuthal direction but also in the radial direction. Spectral analysis shows that the resulting oscillating current pattern has a clearly defined characteristic frequency near the electron cyclotron frequency, suggesting resonance between the cyclotron and plasma oscillations. The resulting far-field THz radiation in the axial direction is also discussed.
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34

Chen, Hua, Juan Han, Shihua Ma, Xiao Li, Tianzhu Qiu, and Xiaofeng Chen. "Clinical Diagnosis of Gastric Cancer by High-Sensitivity THz Fiber-Based Fast-Scanning Near-Field Imaging." Cancers 14, no. 16 (August 15, 2022): 3932. http://dx.doi.org/10.3390/cancers14163932.

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The distinguishable absorption contrast among healthy gastric tissues, carcinoma in situ and cancer tissues in the THz frequency range is one of the keys to realizing gastric cancer diagnosis by THz imaging. Based on microwave devices and a sub-wavelength fiber, we developed a fast-scanning THz imaging system combined with the principle of surface plasmon resonance enhancement. This imaging system has a near-field λ/17 spatial resolution and imaging S/N ratio as high as 108:1, and the image results are directly displayed within 1 min. We also successfully demonstrated the image diagnostic capability on sliced tissues from eight patients with gastric cancer. The results indicate that THz absorption images can not only clearly distinguish cancer tissue from healthy tissues but also accurately define the margins of cancer. Through a medical statistical study of 40 sliced tissues from 40 patients, we prove that THz imaging can be used as a standalone method to diagnose gastric cancer tissues with a diagnostic specificity and sensitivity of 100%. Compared with the H&E staining method, THz imaging diagnosis makes the automation of tissue-sampling pre-screening procedure possible and assists in quickly determining the boundary between cancerous and healthy tissues.
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35

Chen, Hua, Wen-Jeng Lee, Hsin-Yi Huang, Chui-Min Chiu, Yuan-Fu Tsai, Tzu-Fang Tseng, Jen-Tang Lu, Wei-Ling Lai, and Chi-Kuang Sun. "Performance of THz fiber-scanning near-field microscopy to diagnose breast tumors." Optics Express 19, no. 20 (September 22, 2011): 19523. http://dx.doi.org/10.1364/oe.19.019523.

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36

Yu-Ping, Yang, Yan Wei, Xu Xin-Long, Shi Yu-Lei, and Wang Li. "Temporal and Spectral Properties of Subcycle THz Pulses in Near-Field Zone." Chinese Physics Letters 22, no. 6 (May 25, 2005): 1401–4. http://dx.doi.org/10.1088/0256-307x/22/6/028.

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37

Liu, Jingbo, Rajind Mendis, Daniel M. Mittleman, and Naokazu Sakoda. "A tapered parallel-plate-waveguide probe for THz near-field reflection imaging." Applied Physics Letters 100, no. 3 (January 16, 2012): 031101. http://dx.doi.org/10.1063/1.3677678.

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38

Degl'Innocenti, R., M. Montinaro, J. Xu, V. Piazza, P. Pingue, A. Tredicucci, F. Beltram, H. E. Beere, and D. A. Ritchie. "Differential Near-Field Scanning Optical Microscopy with THz quantum cascade laser sources." Optics Express 17, no. 26 (December 11, 2009): 23785. http://dx.doi.org/10.1364/oe.17.023785.

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39

Doi, A., F. Blanchard, H. Hirori, and K. Tanaka. "Near-field THz imaging of free induction decay from a tyrosine crystal." Optics Express 18, no. 17 (August 12, 2010): 18419. http://dx.doi.org/10.1364/oe.18.018419.

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40

Heo, Chaejeong, Taewoo Ha, Chunjae You, Thuy Huynh, Hosub Lim, Jiwon Kim, Mallikarjuna Reddy Kesama, Jinkee Lee, Teun-Teun Kim, and Young Hee Lee. "Identifying Fibrillization State of Aβ Protein via Near-Field THz Conductance Measurement." ACS Nano 14, no. 6 (March 13, 2020): 6548–58. http://dx.doi.org/10.1021/acsnano.9b08572.

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41

Amirkhan, F., R. Sakata, K. Takiguchi, T. Arikawa, T. Ozaki, K. Tanaka, and F. Blanchard. "Characterization of thin-film optical properties by THz near-field imaging method." Journal of the Optical Society of America B 36, no. 9 (August 29, 2019): 2593. http://dx.doi.org/10.1364/josab.36.002593.

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42

Werley, Christopher A., Kebin Fan, Andrew C. Strikwerda, Stephanie M. Teo, Xin Zhang, Richard D. Averitt, and Keith A. Nelson. "Time-resolved imaging of near-fields in THz antennas and direct quantitative measurement of field enhancements." Optics Express 20, no. 8 (March 28, 2012): 8551. http://dx.doi.org/10.1364/oe.20.008551.

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43

Trukhin, Valeriy N., Nikolay N. Zinov’ev, Aleksandr V. Andrianov, Leonid L. Samoilov, Aleksandr O. Golubok, Mikhail L. Felshtyn, Ivan D. Sapozhnikov, Viktor A. Bykov, and Aleksandr V. Trukhin. "Terahertz Coherent Scanning Probe Microscope." Siberian Journal of Physics 5, no. 4 (December 1, 2010): 151–53. http://dx.doi.org/10.54362/1818-7919-2010-5-4-151-153.

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We present the terahertz (THz) scanning probe microscope which combines a THz coherent spectrometer and a scanning probe microscope. It detects forward-scattered radiation and employs harmonic signal demodulation to extract the signal of near-field contribution to scattering of THz electromagnetic waves
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44

Blanchard, François, Takashi Arikawa, and Koichiro Tanaka. "Real-Time Megapixel Electro-Optical Imaging of THz Beams with Probe Power Normalization." Sensors 22, no. 12 (June 14, 2022): 4482. http://dx.doi.org/10.3390/s22124482.

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In this work, we present a simple method to improve the spatial uniformity of two-dimensional electro-optical imaging of terahertz (THz) beams. In this system, near-field THz images are captured by fully illuminating a sample using conventional optical microscope objectives. Unfortunately, due to the linear relationship between the optical probe power and the measured THz electric field, any spatial variation in probe intensity translates directly into a variation of the recorded THz electric field. Using a single normalized background frame information map as a calibration tool prior to recording a sequence of THz images, we show a full recovery of a two-dimensional flat field for various combinations of magnification factors. Our results suggest that the implementation of dynamic intensity profile correction is a promising avenue for real-time electro-optical imaging of THz beams.
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45

Алексеев, П. А., Б. Р. Бородин, И. А. Мустафин, А. В. Зубов, С. П. Лебедев, А. А. Лебедев, and В. Н. Трухин. "Терагерцевый ближнепольный отклик в лентах графена." Письма в журнал технической физики 46, no. 15 (2020): 29. http://dx.doi.org/10.21883/pjtf.2020.15.49745.18256.

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The experimental results of scattering and near-field interaction of a terahertz electromagnetic field with graphene ribbons near a metal probe of an atomic force microscope are reported. The amplification of a near-field terahertz scattering in ribbons is shown in comparison with unstructured graphene. The appearance of resonance peaks in the range 0.2–1.6 THz in the scattering spectra of terahertz radiation on graphene ribbons in the presence of a probe was detected, which is possibly due to the interaction of radiation with plasmons in the ribbons.
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46

Tseng, Tzu-Fang, Szu-Chi Yang, Yuan-Ta Shih, Yuan-Fu Tsai, Tzung-Dau Wang, and Chi-Kuang Sun. "Near-field sub-THz transmission-type image system for vessel imaging in-vivo." Optics Express 23, no. 19 (September 17, 2015): 25058. http://dx.doi.org/10.1364/oe.23.025058.

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47

Nagel, M., A. Michalski, T. Botzem, and H. Kurz. "Near-field investigation of THz surface-wave emission from optically excited graphite flakes." Optics Express 19, no. 5 (February 24, 2011): 4667. http://dx.doi.org/10.1364/oe.19.004667.

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48

Calendron, Anne-Laure, Emma Kueny, Liwei Song, Giovanni Cirmi, Lars Bocklage, Franz X. Kärtner, and Ralf Röhlsberger. "Excitation and control of spin waves in FeBO3 by a strong-field THz pulse." EPJ Web of Conferences 205 (2019): 07008. http://dx.doi.org/10.1051/epjconf/201920507008.

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The dynamically resolved response of the canted-antiferromagnet FeBO3 excited near a magnon resonance shows fast oscillations after THz-excitation’ followed by the magnons’ intrinsic relaxation’ enabling to probe transient magnetic relaxation dynamics over large frequency range.
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49

Fu, Xiuhua, Rongqun Peng, Gang Liu, Jiazheng Wang, Wenhao Yuan, and Michel Kadoch. "Channel Modeling for RIS-Assisted 6G Communications." Electronics 11, no. 19 (September 20, 2022): 2977. http://dx.doi.org/10.3390/electronics11192977.

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Abstract:
Terahertz communication has been proposed as one of the basic key technologies of the sixth-generation wireless network (6G) due to its significant advantages, such as ultra-large bandwidth, ultra-high transmission rates, high-precision positioning, and high-resolution perception. In terahertz-enabled 6G communication systems, the intelligent reconfiguration of wireless propagation environments by deploying reconfigurable intelligent surfaces (RIS) will be an important research direction. This paper analyzes the far field and near field of RIS-assisted wireless communication and a detailed system description is presented. Subsequently, this paper presents a specific study of the channel model for an RIS-assisted 6G communication system in the far-field and near-field cases, respectively. Finally, an integrated simulation of the channel models for the far-field and near-field cases is carried out, and the performance of the RIS auxiliary link measured in terms of signal-to-noise ratio (SNR) is compared and analyzed. The results show that increasing the size of the RIS surface to improve the SNR is an effective method to enhance the coverage performance of the 6G THz communication system under the strong guarantee of the ultra-large bandwidth of THz.
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50

Kuschewski, F., H. G. von Ribbeck, J. Döring, S. Winnerl, L. M. Eng, and S. C. Kehr. "Narrow-band near-field nanoscopy in the spectral range from 1.3 to 8.5 THz." Applied Physics Letters 108, no. 11 (March 14, 2016): 113102. http://dx.doi.org/10.1063/1.4943793.

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