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Journal articles on the topic 'THz filter'

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Author: Grafiati

Published: 10 December 2022

Last updated: 30 January 2023

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1

Zhang, Xiao Yu, Zhong Xin Zheng, Xin Xing Li, Ren Bing Tan, Zhi Peng Zhang, Yu Zhou, Jian Dong Sun, Bao Shun Zhang, and Hua Qin. "Terahertz Filter Based on Frequency Selective Surfaces." Advanced Materials Research 571 (September 2012): 362–66. http://dx.doi.org/10.4028/www.scientific.net/amr.571.362.

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Terahertz filters based on the frequency selective surfaces (FSS) structure have been modeled and fabricated on the sapphire substrate. The terahertz (THz) transmission properties are investigated using a THz time-domain spectroscopy (THz-TDS) system. The designed two FSS-based THz filters exhibit the THz electromagnetic wave transmission and reflection characteristics, respectively, showing about 70% change of THz transmission at the frequency of 1.3 THz. It is suggested that the THz filtering effect results from the resonance behavior between THz plane-wave and resonant elements of designed metallic FSS structures. The agreement between experiments and simulations indicate that the designed THz filter show a great potential application for high-speed THz modulator.

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2

Pavia, João Pedro, Nuno Souto, and Marco Alexandre Ribeiro. "Design of a Reconfigurable THz Filter Based on Metamaterial Wire Resonators with Applications on Sensor Devices." Photonics 7, no. 3 (July 10, 2020): 48. http://dx.doi.org/10.3390/photonics7030048.

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A study on the design, simulation and characterization of a reconfigurable terahertz (THz) filter, composed of two frequency-selective surfaces (FSSs) with applications on sensor devices in general and highly sensitive stress sensors, is presented in this paper. Using the developed theoretical model, we found out that by careful tuning the wire parameters, it is possible to control the filter sensitivity and also the energy transmission and reflection that passes through the structure. Numerical modelling of both the mechanical and electromagnetic components (using the elasticity equation and Maxwell’s equations, respectively) has been undertaken for two types of the device assemblies based on different thermoplastic polymers transparent to the THz radiation, namely: high-density polyethylene (HDPE) and polytetrafluoroethylene (PTFE), operating in a THz window from 395 to 455 GHz. The numerical results allowed us to characterize the relation between the reflectance/transmittance and the amount of force required to obtain a specific frequency shift along that window. It was found that the device assembled with HDPE presents a more linear response and it is able to pass from a full transparency to almost full opacity using only its linear operating zone. Due to its characteristics, this THz filter might be an interesting solution not only for THz sensors based on reconfigurable filters but also for optical modulators for the THz domain.

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3

Huang, Ying, Taiyu Okatani, and Yoshiaki Kanamori. "Broadband stop filters for THz waves using H-shaped metamaterials with dual electronic-plasmonic functionality." Japanese Journal of Applied Physics 61, SD (March 24, 2022): SD1007. http://dx.doi.org/10.35848/1347-4065/ac55dd.

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Abstract Terahertz (THz) waves have attracted extensive attention recently owing to their spectral specificity and transmission properties. For developing THz technologies, filters are significant devices because they can manipulate waves transmission. Metamaterials (MMs) possess unique optical characteristics that are not available in natural materials, have been developed for THz filters. However, reported MMs with separated units only excite plasmonic resonances, which limits their application. Here, broadband stop filters based on H-shaped MMs (H-MMs) for THz waves were proposed. The H-MM has two continuous metallic arms that can flow the electric current, allowing it to benefit electronic applications meanwhile keeping the plasmonic characteristics. A stopband with a central frequency of 0.65 THz and a −10 dB bandwidth of 458 GHz was experimentally demonstrated. Moreover, this filter can freely tune its bandwidth and central frequency by designing its geometry, which provides it with potential in wide THz applications such as THz communications.

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4

Zhai, Dongwei, Yuping Yang, Zhaoxin Geng, Bin Cui, and Rong Zhao. "A High-Selectivity THz Filter Based on a Flexible Polyimide Film." IEEE Transactions on Terahertz Science and Technology 8, no. 6 (November 2018): 719–24. http://dx.doi.org/10.1109/tthz.2018.2872414.

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5

Wang, Fengjuan, Vasilis F. Pavlidis, and Ningmei Yu. "Miniaturized SIW Bandpass Filter Based on TSV Technology for THz Applications." IEEE Transactions on Terahertz Science and Technology 10, no. 4 (July 2020): 423–26. http://dx.doi.org/10.1109/tthz.2020.2974091.

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6

Shipilo, Daniil E., Nikolay A. Panov, Irina A. Nikolaeva, Alexander A. Ushakov, Pavel A. Chizhov, Kseniia A. Mamaeva, Vladimir V. Bukin, Sergey V. Garnov, and Olga G. Kosareva. "Low-Frequency Content of THz Emission from Two-Color Femtosecond Filament." Photonics 9, no. 1 (December 29, 2021): 17. http://dx.doi.org/10.3390/photonics9010017.

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We experimentally investigate the low-frequency (below 1 THz) spectral content of broadband terahertz (THz) emission from two-color femtosecond filament formed by the 2.7-mJ, 40-fs, 800+400-nm pulse focused into air. For incoherent detection, we screened the Golay cell by the bandpass filters and measured the THz angular distributions at the selected frequencies ν=0.5, 1, 2 and 3 THz. The measured distributions of THz fluence were integrated over the forward hemisphere taking into account the transmittance of the filters, thus providing the estimation of spectral power at the frequencies studied. The spectral power decreases monotonically with the frequency increasing from 0.5 to 3 THz, thus showing that the maximum of THz spectrum is attained at ν≤0.5 THz. The THz waveform measured by electro-optical sampling (EOS) based on ZnTe crystal and transformed into the spectral domain shows that there exists the local maximum of the THz spectral power at ν≈1 THz. This disagrees with monotonic decrease of THz spectral power obtained from the filter-based measurements. We have introduced the correction to the spectral power reconstructed from EOS measurements. This correction takes into account different focal spot size for different THz frequencies contained in the broadband electromagnetic pulse. The corrected EOS spectral power is in semi-quantitative agreement with the one measured by a set of filters.

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7

Liu, Chuqing, Jiasheng Ye, and Yan Zhang. "Thermally tunable THz filter made of semiconductors." Optics Communications 283, no. 6 (March 2010): 865–68. http://dx.doi.org/10.1016/j.optcom.2009.11.019.

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8

Liu, Shuang, Jiang Hu, Yong Zhang, Zhongwan Zheng, Yupeng Liu, Ruimin Xu, and Quan Xue. "1 THz Micromachined Waveguide Band-Pass Filter." Journal of Infrared, Millimeter, and Terahertz Waves 37, no. 5 (December 1, 2015): 435–47. http://dx.doi.org/10.1007/s10762-015-0229-6.

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9

Liu, Jianjun, and Zhi Hong. "Mechanically tunable dual frequency THz metamaterial filter." Optics Communications 426 (November 2018): 598–601. http://dx.doi.org/10.1016/j.optcom.2018.06.019.

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10

Wang, Jingjing, Kai Guo, and Zhongyi Guo. "THz filter based on the Si microdisk array." AIP Advances 9, no. 4 (April 2019): 045106. http://dx.doi.org/10.1063/1.5083004.

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11

Mutepfe, Cleophas D. K., and Viranjay M. Srivastava. "Design and Implementation of Graphene-Based Tunable Microwave Filter for THz Applications." Nanomaterials 12, no. 24 (December 14, 2022): 4443. http://dx.doi.org/10.3390/nano12244443.

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A reconfigurable Substrate-Integrated Waveguide (SIW) filter operating in the THz region was designed in this work. Two SIW resonators were coupled through a magnetic iris to form a second-order filter with a double-layer substrate. The first substrate was silicon of permittivity 11.9; on top of it, silicon dioxide of permittivity 3.9 was placed. The ground and upper plane were composed of gold plates. Graphene material was then used for the tunability of the filter. A thin graphene sheet was sandwiched between the silicon dioxide substrate and the upper gold plate. An external DC bias voltage was then applied to change the chemical potential of graphene, which, in turn, managed to change the operational center frequency of the filter within the range of 1.289 THz to 1.297 THz, which translated to a bandwidth range of 8 GHz. The second part of this work centered on changing the aspect ratio of the graphene patch to change the center frequency. It was observed that the frequency changed within the range of 1.2908 THz to 1.2929 THz, which gave a bandwidth of 2.1 GHz change.

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12

Tukmakova, Anastasiia, Ivan Tkhorzhevskiy, Artyom Sedinin, Aleksei Asach, Anna Novotelnova, Natallya Kablukova, Petr Demchenko, Anton Zaitsev, Dmitry Zykov, and Mikhail Khodzitsky. "FEM Simulation of Frequency-Selective Surface Based on Thermoelectric Bi-Sb Thin Films for THz Detection." Photonics 8, no. 4 (April 11, 2021): 119. http://dx.doi.org/10.3390/photonics8040119.

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Terahertz (THz) filters and detectors can find a wide application in such fields as: sensing, imaging, security systems, medicine, wireless connection, and detection of substances. Thermoelectric materials are promising basis for THz detectors’ development due to their sensitivity to the THz radiation, possibility to be heated under the THz radiation and produce voltage due to Seebeck effect. Thermoelectric thin films of Bi-Sb solid solutions are semimetals/semiconductors with the band gap comparable with THz energy and with high thermoelectric conversion efficiency at room temperature. Detecting film surface can be transformed into a periodic frequency selective surface (FSS) that can operate as a frequency filter and increases the absorption of THz radiation. We report for the first time about the simulation of THz detector based on thermoelectric Bi-Sb thin-filmed frequency-selective surface. We show that such structure can be both detector and frequency filter. Moreover, it was shown that FSS design increases not only a heating due to absorption but a temperature gradient in Bi-Sb film by two orders of magnitude in comparison with continuous films. Local temperature gradients can reach the values of the order of 100 K·mm−1. That opens new perspectives for thin-filmed thermoelectric detectors’ efficiency increase. Temperature difference formed due to THz radiation absorption can reach values on the order of 1 degree. Frequency-transient calculations show the power dependence of film temperature on time with characteristic saturation at times around several ms. That points to the perspective of reaching fast response times on such structures.

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13

Chen, Ying, Jianwei Cheng, and Chaowu Liang. "Switchable Terahertz Band-Pass/Band-Stop Filter Enabled by Hybrid Vanadium Dioxide Metamaterial." Advances in Condensed Matter Physics 2020 (December 5, 2020): 1–6. http://dx.doi.org/10.1155/2020/3902835.

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To date, little research has been carried out on the integration of switchable and diversified functionalities into a single metamaterial in the terahertz (THz) range. Here, a hybrid vanadium dioxide (VO2) metamaterial was designed with switchable properties of band-pass filter and band-stop filter in the frequency range of 0.3–1.6 THz. Simulations demonstrated that under TE polarization, the proposed system acted as band-stop filter with the center frequency of 0.95 THz when VO2 is in the insulating state. Upon the transformation of VO2 into the metallic state, the proposed system behaved as a band-pass filter with a transmittance of >80%. The physical mechanism of the band-pass/band-stop conversion was examined by analyzing the surface current distribution of the designed device. The switchable characteristics of this structure can enable its wide application in tunable THz functional components such as amplitude modulators, polarization control, and intelligent switches.

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14

Xiao, Yu, Peizhe Shan, Kaiqiang Zhu, Houjun Sun, and Fan Yang. "Analysis of a Novel Singlet and Its Application in THz Bandpass Filter Design." IEEE Transactions on Terahertz Science and Technology 8, no. 3 (May 2018): 312–20. http://dx.doi.org/10.1109/tthz.2018.2823541.

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15

Lin, Chu-Hsuan, and Yu-Hsiang Cheng. "A THz Waveguide Bandpass Filter Design Using an Artificial Neural Network." Micromachines 13, no. 6 (May 27, 2022): 841. http://dx.doi.org/10.3390/mi13060841.

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This paper presents a 300 GHz waveguide bandpass filter based on asymmetric inductive irises. The coupling matrix synthesis technique is used to design a 6-pole Chebyshev filter. In addition, an artificial neural network is applied to provide the filter geometries using the desired frequency response. The optimized filter is fabricated by the computer numeric controlled milling process. The measurement results show that the insertion loss is less than 3 dB and the return loss is better than 17 dB in the range 276–310 GHz.

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16

Yang, Yuhua, Yongqing Xu, Binzhen Zhang, Junping Duan, Li Yan, Hongcheng Xu, Yunpeng Liu, and Yanan Shi. "Investigating flexible band-stop metamaterial filter over THz." Optics Communications 438 (May 2019): 39–45. http://dx.doi.org/10.1016/j.optcom.2019.01.023.

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17

Zhang, Shi-Yang, Jing Ma, Hai-Ling He, Cheng-Guo Tong, Huan Liu, Ya-Xian Fan, and Zhi-Yong Tao. "An Electrically Tunable Terahertz Filter Based on Liquid-Crystal-Filled Slits with Wall Corrugations." Photonics 9, no. 12 (November 23, 2022): 894. http://dx.doi.org/10.3390/photonics9120894.

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We propose a type of hollow planar waveguide with corrugated walls, which can realize electrically tunable terahertz (THz) filtering by filling the slit with liquid crystals. When the THz signals propagate in a planar waveguide with periodic corrugations, the transmission spectrum always exhibits many pass and stop bands. Inserting a section of defects in the middle of the periodic corrugations can excite an extremely narrow transmission peak, which would be a very good THz filter for frequency division. To achieve tunability of this narrow linewidth THz filter, we also fill the slit between the two corrugated walls with a nematic liquid crystal. The effective refractive index of liquid crystals will change with the external electric field, thus tuning the frequency of the narrow peak. The simulated results show that the center frequency of the proposed filter can be tuned linearly in the frequency range of 0.984~1.023 THz by the external electric field. Moreover, the bandwidth of the filter can be adjusted from 3.2 GHz to 0.3 GHz by increasing the number of periods in the waveguide, and a maximum Q value of 2556 can be achieved when the number of periods at both sides of the defect is 12.

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18

Vishwanath, M., and Dr Habibullakhan. "Design and Simulation of Compact Band-Pass Filter Using Stub Loaded Plasmonic Mim Waveguide." International Journal of Engineering & Technology 7, no. 3.3 (June 21, 2018): 41. http://dx.doi.org/10.14419/ijet.v7i3.3.14482.

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In this article, plasmonic band-pass filters (BPF) have been studied and numerically analyzed. This filter has been designed based on the two-stubs. Pass-band can be realized by appropriately adjusting the lengths and width of the resonator. Based on the ideal characteristics of the proposed two stubs BPF is allowing the band at THz frequencies. Multiple transmission zeros are generated to improve the selectivity of the filter. All simulated results have been studied using CST Microwave studio suite. Usually, the transmission effectiveness is revealed by the exact resonance condition, whichwill confirmalong with the numerical simulation or theoretical analysis. This article delivers a promising application for plasmonic BPFsin addition to plasmonic integrated circuits (PICs).

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19

Born, Norman, Aurelian Crunteanu, Georges Humbert, Annie Bessaudou, Martin Koch, and Bernd M. Fischer. "Switchable THz Filter Based on a Vanadium Dioxide Layer Inside a Fabry–Pérot Cavity." IEEE Transactions on Terahertz Science and Technology 5, no. 6 (November 2015): 1035–39. http://dx.doi.org/10.1109/tthz.2015.2478448.

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20

Moumane, Ibtissame, Jamal Zbitou, M. Latrach, A. Errkik, and O. Chakkor. "A novel configuration of THz photonic transmitter." Indonesian Journal of Electrical Engineering and Computer Science 13, no. 1 (January 1, 2019): 258. http://dx.doi.org/10.11591/ijeecs.v13.i1.pp258-264.

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In this paper we present a new design of a photonic transmitter based on multi-layers substrate GaAs and using for generation of THz waves. The proposed circuit is composed from a photodetector (PD) “which converts the light to the electrical signal”, THz Antenna, low-pass filter and DC probe. Firstly we have optimized the THz antenna using an EM solver which is Momentum integrated in ADS “Advanced Design System”.Then we have optimized the low pass filter which plays the role of inductance that is an RF choke permiting to separate the RF signal from the DC one. Finally, we have associated the different components, add the DC probe and simulate the whole proposed system. The dimensions of the final circuit are 400.317x167.16 UM2 . The obtain results permit to validate the final circuit at THz and make it suitable for THz applications.

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21

Liu, Jiamin, Zia Ullah Khan, and Siamak Sarjoghian. "Layered THz waveguides for SPPs, filter and sensor applications." Journal of Optics 48, no. 4 (November 12, 2019): 567–81. http://dx.doi.org/10.1007/s12596-019-00569-3.

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Abstract Theory of five kinds of layered structure THz waveguides is presented. In these waveguides, the modified and hybrid THz surface plasmon-polaritons (SPPs) are researched in detail. On these modes, the effects of material in each layer are discussed. The anti-resonant reflecting mechanism is also discussed in these waveguides. The mode characteristics of both TM mode and TE mode are analyzed for guiding TM mode with low loss and TE modes with huge loss in one waveguide: the TE modes filter application is put forward. The mode characteristics for one waveguide have useful sensor applications: for TE1 mode, we find that the low cut-off frequency has a sensitivity (S) to the refractive index of the dielectric slab. The highest S can be 666.7 GHz/RIU when n2 = 1.5, w = 0 and t = 0.1 mm. We believe these results are very useful for designing practical THz devices for SPPs, filter and sensor applications.

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22

Udomariyasap, Pongputhai, Suthichai Noppanakeepong, and Nithiroth Pornsuwancharoen. "High Frequency Generation Based-On Nonlinear Micro Ring Resonator for Frequency Band Enhancement." Advanced Materials Research 979 (June 2014): 508–11. http://dx.doi.org/10.4028/www.scientific.net/amr.979.508.

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Propose the simulation of THz carrier frequencies using the small device and a Gaussian beam propagating within the device system. We found that the generated output power with the high frequency can be achieved. This consisted of a serial nonlinear micro ring resonator system for generating pulse and signal filter by Add/Drop filter, a technology optical communication by the micro ring resonator which generates the THz frequency multiple, whereas channel capacity in term of multi frequency bands can be provided by optical Add/Drop multiplexing. The increase in the number of channel capacity can be obtained by the increase in frequency density, while the security was introduced by the specific frequency filter, which was operated by the central operator. The optical micro ring resonators for THz frequency generation and enhancement are reviewed. The advantage of proposed system can be implemented by using the simultaneous optical communication system.

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23

Kumar, Arjun, and M. V. Kartikeyan. "A Design of a Terahertz Microstrip Bandstop Filter with Defected Ground Structure." Active and Passive Electronic Components 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/192018.

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A planar microstrip terahertz (THz) bandstop filter has been proposed with defected ground structure with high insertion loss (S21) in a stopband of −25.8 dB at 1.436 THz. The parameters of the circuit model have been extracted from the EM simulation results. A dielectric substrate of Benzocyclobutene (BCB) is used to realize a compact bandstop filter using modified hexagonal dumbbell-shape defected ground structure (DB-DGS). In this paper, a defected ground structure topology is used in aλ/4, 50 Ω microstrip line at THz frequency range for compactness. No article has been reported on the microstrip line at terahertz frequency regime using DGS topology. The proposed filter can be used for sensing and detection in biomedical instruments in DNA testing. All the simulations/cosimulations are carried out using a full-wave EM simulator CST V.9 Microwave Studio, HFSS V.10, and Agilent Design Suite (ADS).

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24

Pan, Wu, Jun Zhang, Xuan Yu, and Wei Zeng. "Design and Analysis of Compound Multilayer Metamaterial Filter in THz Region." Applied Mechanics and Materials 872 (October 2017): 293–99. http://dx.doi.org/10.4028/www.scientific.net/amm.872.293.

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A periodic microstructure with dielectric and metal layers is proposed to obtain a bandpass filter. The multilayer microstructure is compounded of ring cross slot and cross slot. The center frequency of the filter is 0.338THz with a 3dB bandwidth of 75.62GHz. The maximum insertion loss in the pass band reaches 0.60dB. The bandedge transitions of the rejection bands are 232dB/THz and 176dB/THz, respectively. Furthermore, the physical mechanism of near field distribution and the influence of two factors (the number of metal layer and dielectric layer) on the passband have been studied. Meanwhile, the frequency response is analyzed for different incident angles and polarizations. The frequency response characteristic is insensitive to the polarization, and a good performance for incident angle of the transmission is obtained. It can be applied to THz atmospheric communication system.

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25

Sanphuang, Varittha, Niru K. Nahar, and John L. Volakis. "THz spatial filter employing bimaterial switching for temperature sensing." Microwave and Optical Technology Letters 59, no. 1 (November 24, 2016): 168–71. http://dx.doi.org/10.1002/mop.30254.

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26

Xu, Tao, and Yu-Sheng Lin. "Tunable Terahertz Metamaterial Using an Electric Split-Ring Resonator with Polarization-Sensitive Characteristic." Applied Sciences 10, no. 13 (July 6, 2020): 4660. http://dx.doi.org/10.3390/app10134660.

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We present a tunable terahertz (THz) metamaterial using an electric split-ring resonator (eSRR), which exhibits polarization-sensitive characteristics. The proposed eSRR is composed of double symmetrical semicircles and two central metal bars. By changing the lengths of two metal bars, the electromagnetic responses can be tuned and switched between dual-band and triple-band resonances in transverse magnetic (TM) mode. Furthermore, by moving the bottom metal bar to change the gap between the two metal bars, the first resonance is stable at 0.39 THz, and the second resonance is gradually blue-shifted from 0.83 to 1.33 THz. The tuning range is 0.50 THz. This means that the free spectrum ranges (FSR) could be broadened by 0.50 THz. This proposed device exhibits a dual-/triple-band switch, tunable filter, tunable FSR and polarization-dependent characteristics. It provides an effective approach to perform tunable polarizer, sensor, switch, filter and other optoelectronics in THz-wave applications.

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27

SI, LI-MING, and XIN LV. "TERAHERTZ WAVES HAIRPIN MICROSTRIP BAND-PASS FILTER AND ITS APPLICATION TO OVERLAID DIELECTRIC MATERIAL DETECTION." Modern Physics Letters B 22, no. 29 (November 20, 2008): 2843–48. http://dx.doi.org/10.1142/s0217984908017412.

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A novel terahertz (THz) waves band-pass filter with the center frequency of 880 GHz and low insertion loss using microstrip line hairpin resonators is introduced. The properties of this filter are investigated by finite element method (FEM) simulations. The numerical result shows that the filter has a 3 dB bandwidth from 865 GHz to 892 GHz and has 80 GHz bandwidth better than -10 dB. Resonance frequency shifts of the filter covered by dielectric materials of different permittivity and thickness are calculated, which shows that this type of filter is suitable for detecting the properties of overlaid dielectric materials.

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28

Zaitsev, Anton, Alexander Grebenchukov, and Mikhail Khodzitsky. "Tunable THz Graphene Filter Based on Cross-In-Square-Shaped Resonators Metasurface." Photonics 6, no. 4 (November 12, 2019): 119. http://dx.doi.org/10.3390/photonics6040119.

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The tunable terahertz (THz) Fano-resonant filter based on hybrid metal-graphene metamaterial was proposed. The optical parameters of metasurface with unit cell in the form of a cross-shaped graphene sheet in the center of a square gold ring were simulated by the finite element method using a surface conductivity model of a graphene monolayer. The narrowband modulation of the transmission by varying the Fermi level of the graphene and the position of graphene cross inside the metal ring was demonstrated. Simulation results were well explained theoretically using a three-coupled oscillator model. The proposed device can be used as a narrowband filter in wireless THz communication systems and sensing applications.

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29

Gao, Tao, Feng Huang, Yanqing Chen, Weilin Zhu, Xuewei Ju, and Xiangfeng Wang. "Resonant Coupling Effects in a Double-Layer THz Bandpass Filter." Applied Sciences 10, no. 15 (July 22, 2020): 5030. http://dx.doi.org/10.3390/app10155030.

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Cascading similar frequency selective surfaces (FSSs) improves the roll-off rate and frequency selectivity of THz bandpass filters. However, resonant coupling between FSS layers causes anomalous transmission peaks. In this work, we have employed an equivalent circuit model to analyze a double-layer FSS structure with periodic cross apertures at different interlayer spacing. We found that the anomalous peaks can be attributed to the resonant coupling between the upper and lower layer FSSs, and their periodic appearance with changing interlayer spacing is related to the half-wavelength repeatability of the circuit. We have fabricated a double-layer FSS sample using femtosecond laser micromachining and measured it using time-domain THz spectroscopy. The results using the equivalent circuit model agree with the Finite-Difference Time-Domain (FDTD) and experimental results.

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30

Kong, Mengdan, Yongle Wu, Zheng Zhuang, Weimin Wang, and Yuan'an Liu. "GRAPHENE-BASED THZ TUNABLE BANDSTOP FILTER WITH CONSTANT ABSOLUTE BANDWIDTH." Progress In Electromagnetics Research Letters 71 (2017): 141–47. http://dx.doi.org/10.2528/pierl17101301.

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31

Das, Subrata, Khan Mamun Reza, and Md Ahsan Habib. "Frequency Selective Surface Based Bandpass Filter for THz Communication System." Journal of Infrared, Millimeter, and Terahertz Waves 33, no. 11 (September 20, 2012): 1163–69. http://dx.doi.org/10.1007/s10762-012-9936-4.

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32

Fahad, Ruan, and Chen. "A Wideband Terahertz Transmissive Polarization Manipulator Based on Metasurfaces." Electronics 8, no. 10 (September 20, 2019): 1068. http://dx.doi.org/10.3390/electronics8101068.

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Wideband and multifunction operation for THz polarization manipulating devices has been desired for a wide range of applications. In this paper, a novel wideband transmissive type polarization manipulator based on metasurfaces is proposed in the THz region. The designed metasurface acts as a multifunctional polarization manipulator, performing linear to circular polarization conversion (LCPC) for relative bandwidth 43.9% (0.94 THz to 1.47 THz) for incident x/y polarizations and a wideband bandpass filter with relative bandwidth 67% (0.713 THz to 1.4346 THz) for incident slant (xy) polarizations. Wideband LCPC operation is achieved using a unique diagonal symmetric structure based on a bilayered metasurface. In order to confirm the validation of proposed results, electromagnetic simulation was carried out in two industry-standard software packages, HFSS and CST, using frequency domain and time domain solvers, respectively. Close agreement between numerical results depicts the validity and reliability of the proposed design. Polarized wave trajectory, equivalent microscopic circuit, physical mechanisms, and impact of different geometrical parameters on the performance is investigated. To the best of our knowledge, this is the first polarization manipulator based on bilayered metasurfaces. The same structure can be used as for LCPC and the transmit reject filter for THz wireless communication, including THz satellite communications, the future of communication. Moreover, they can be used in THz imaging and biomolecular control devices.

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33

Moumane, Ibtissame, J. Zbitou, M. Latrach, A. Errkik, O. Chakkor, and A. Fouad. "Design of CW THz PhotonicTtransmitter based on Low Pass-Filter and Bow-tie Wideband Antenna." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (October 1, 2018): 3801. http://dx.doi.org/10.11591/ijece.v8i5.pp3801-3808.

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This paper presents the design of Continuous Wave Terahertz photonic transmitters which is composed from photodetector (PD) associated to a wideband antenna, low–pass filter (LPF) and DC Probe. Firstly, we have developed the bow-tie wideband antenna using an EM solver Momentum integrated in ADS “Advanced Design System”. Then we had optimized a low-pass filter which is responsible of blocking the RF signal providing from the antenna to reach the DC probe. And finally, we have validated into simulation the CW THz photonic transmitter. The three structures are based on multi-layers GaAs substrate, which is the most widely used for THz circuit design. The dimensions of the Whole circuit are 776.788 × 303.39〖μm〗^2.<br /><br />

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Bitra, S. K., and S. Miriyala. "An Ultra-Wideband Band Pass Filter using Metal Insulator Metal Waveguide for Nanoscale Applications." Engineering, Technology & Applied Science Research 11, no. 3 (June 9, 2021): 7247–50. http://dx.doi.org/10.48084/etasr.4194.

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A T-stub Square Ring Resonator (SRR) based Ultra-Wide Band (UWB) Band Pass Filter (BPF) is studied and investigated in this paper. The proposed filter is based on coupled feed line connected to the T-stub SRR. Ultra-wideband characteristics can be realized by adjusting the T-stub lengths and coupling the gaps between both sides of waveguides and SRR. The characteristics of the T-stub SRR show that the miniaturized UWB BPF can be operated at THz frequencies. The proposed UWB filter is simulated and analyzed using the Finite Differential Time Domain (FDTD) solver-based Computer Simulation Technology (CST) studio suite. The resonance conditions are explained and the transmission performance of the filter agrees with the simulated and theoretical calculations. The proposed filter is best suitable for Electronic-Plasmonic Integrated Circuits (EPICs).

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Takesue, H., F. Yamamoto, K. Shimizu, and T. Horiguchi. "1 THz lightwave synthesised frequency sweeper with synchronously tuned bandpass filter." Electronics Letters 34, no. 15 (1998): 1507. http://dx.doi.org/10.1049/el:19981062.

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Zhong, Yibing, Yinshan Yu, Shengli Shi, Mingxing Gao, Yuhao Wang, and Chunyan Lv. "Tunable THz Graphene Plasmonic Filter Based on One-Dimensional Photonic Quasicrystals." Acta Physica Polonica A 138, no. 6 (December 2020): 763–69. http://dx.doi.org/10.12693/aphyspola.138.763.

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Moazami, Amin, Mahdieh Hashemi, and Najmeh Cheraghi Shirazi. "High Efficiency Tunable Graphene-Based Plasmonic Filter in the THz Frequency Range." Plasmonics 14, no. 2 (July 25, 2018): 359–63. http://dx.doi.org/10.1007/s11468-018-0812-5.

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Nebioğlu, Mehmet Ali, Taylan Takan, Hakan Altan, Yasemin Demirhan, Hakan Alaboz, Lütfi Özyüzer, and Cumali Sabah. "An indium tin oxide metasurface filter for terahertz applications: Design, fabrication, and characterization." Modern Physics Letters B 31, no. 08 (March 20, 2017): 1750074. http://dx.doi.org/10.1142/s0217984917500749.

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In this paper, using a cross-shaped complementary Indium Tin Oxide (ITO)-based metasurface design, the transmission of THz radiation is shown to be filtered within the 3 dB level from maximum in the frequency range of interest ([Formula: see text][Formula: see text]333 GHz). Various metasurface structures primarily composed of cross-shaped openings with a 400 micron unit cell size are patterned on top of 1750 micron thick fused silica substrates. They are patterned using UV lithography methods after the films were grown using DC sputtering. The fabricated structures were characterized using Terahertz Time Domain Spectroscopy (THz-TDS) measurement technique. The measured transmission agrees well with the simulation of the structure for four different samples with different geometries. These results suggest that metasurface and/or metamaterial patterns based on ITO in visibly transparent media can be utilized for filtering of frequencies in the long wavelength spectrum. These types of filters can be very useful in the near future for THz communication and security applications.

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Kochnev, Z. S., A. I. Knyazkova, T. A. Mashcheryakova, G. R. Raspopin, and A. V. Borisov. "Control of terahertz polarization-sensitive filters based on the formation by a magnetic field of structures of microparticles of the 5BDSR alloy in a liquid medium." Izvestiya vysshikh uchebnykh zavedenii. Fizika, no. 11 (2021): 134–38. http://dx.doi.org/10.17223/00213411/64/11/134.

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This work presents the results of the development of a version of a polarization-sensitive magnetic-field-controlled bandpass filter in the range from 0.2 to 1.5 THz. The filter is based on a magnetic fluid created by the authors, consisting of 5BDSR alloy microparticles up to 50 microns in size and 5W40 synthetic motor oil for automobiles. It was also shown that by controlling the behavior of microparticles in a magnetic fluid using an external magnetic field, one can create an analogue of diffraction gratings.

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Lee, Eui-Su, and Tae-In Jeon. "THz Filter Using the Transverse-electric (TE1) Mode of the Parallel-plate Waveguide." Journal of the Optical Society of Korea 13, no. 4 (December 25, 2009): 423–27. http://dx.doi.org/10.3807/josk.2009.13.4.423.

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Makaravičiūtė, Lygita, and Eglė Marčiulaitienė. "CONDUCTIVITY TESTING AND EVALUATION / PAVIRŠINIŲ NUOTEKŲ FILTRO HIDRAULINIO LAIDUMO TYRIMAI IR VERTINIMAS." Mokslas – Lietuvos ateitis 7, no. 4 (September 29, 2015): 436–42. http://dx.doi.org/10.3846/mla.2015.810.

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Surface wastewater is consideredas effluents, which are formed on the surface of urbanized areas. Stormwater treatment is performed out using a variety of filters: sand, grass. Wastewater penetration into the deeper layers is called hydraulic conductivity. After evaluation of the hydraulic conductivity, it is possible to determine the ability of the investigated fillers to entrap the stormwater flow. The hydraulic conductivity tests can indicate which fillers of stormwater filters may influence the more effective stormwater cleaning. Four stormwater filters were tested: crushed autoclaved aerated concrete filter; crushed autoclaved aerated concrete with Meadow grass (Poa pratensis) layer; silica sand filter with Meadow grass (Poa pratensis) layer; silica sand filter. Under in-situ conditions hydraulic conductivity in filters is investigated using Constant-head method. Mathematical modeling program Hydrus-1D presentsthe changes of hydraulic conductivity in each filler layer of the filter. Assessed hydraulic conductivity in filters under in-situ conditions hasn‘t changed only in crushed autoclaved aerated concrete filter (30 000 mm/d). The smallest hydraulic conductivity in filters under in-situ conditions was estimated in silica sand filter with Meadow grass (Poa pratensis) layer, here it was equal to 209.3 mm/d.With mathematical modeling program Hydrus-1D it was found that the hydraulic conductivity in each filter decreases, depending on the depth of filler in the filter. Paviršinėmis nuotekomis laikomos tokios, kurios susidaro ant urbanizuotos teritorijos paviršiaus. Paviršinių nuotekų valymas atliekamas taikant įvairius filtrus – smėlio, augalinius. Nuotekų skverbimasis į gilesnius sluoksnius vadinamas hidrauliniu laidumu. Įvertinus hidraulinį laidumą galima nustatyti tiriamų filtro užpildų gebėjimą sulaikyti atitekėjusių paviršinių nuotekų srautą filtro užpilduose. Atlikus hidraulinio laidumo tyrimus, galima nustatyti, kurie paviršinių nuotekų filtro užpildai gali lemti efektyvesnį paviršinių nuotekų išvalymą. Tiriami keturi paviršinių nuotekų filtrai: smulkinto autoklavinio akytojo betono filtras; smulkinto autoklavinio akytojo betono ir pievinės miglės dangos filtras; kvarcinio smėlio filtras su pievinės miglės danga; kvarcinio smėlio filtras. Natūrinėmis sąlygomis hidraulinio laidumo tyrimas atliekamas, taikant Constant-Head metodą. Matematinio modeliavimo programa Hydrus-1D pateikiama, kaip kinta hidraulinis laidumas kiekviename filtro užpildo sluoksnyje. Nustatytas hidraulinis laidumas filtruose natūrinėmis sąlygomis nekito smulkinto autoklavinio akytojo betono filtre (30 000 mm/d). Mažiausias hidraulinis laidumas natūrinėmis sąlygomis nustatytas kvarcinio smėlio filtre su pievinės miglės (Poa pratensis) augalinės dangos sluoksniu, čia jis nustatytas 209,3 mm/d. Matematinio modeliavimo programa Hydrus-1D nustatyta, kad hidraulinis laidumas filtruose mažėja priklausomai nuo filtro užpildo gylio.

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Teng Chen-Chen, Zhou Wen, Zhuang Yu-Yang, and Chen He-Ming. "Low loss and narrow-band THz filter based on magnetic photonic crystals." Acta Physica Sinica 65, no. 2 (2016): 024210. http://dx.doi.org/10.7498/aps.65.024210.

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Khani, Amir Ali Mohammad. "A graphene-based THz wave duplexer and filter: Switching via gate biasing." Optik 251 (February 2022): 168432. http://dx.doi.org/10.1016/j.ijleo.2021.168432.

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Liu, Weiwei, Zijie Dai, Jing Yang, Quan Sun, Cheng Gong, Nan Zhang, Kosei Ueno, and Hiroaki Misawa. "Ultrabroad and Angle Tunable THz Filter Based on Multiplexed Metallic Bar Resonators." IEEE Photonics Technology Letters 30, no. 24 (December 15, 2018): 2103–6. http://dx.doi.org/10.1109/lpt.2018.2877964.

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Lee, Eui Su, and Tae-In Jeon. "Tunable THz notch filter with a single groove inside parallel-plate waveguides." Optics Express 20, no. 28 (December 20, 2012): 29605. http://dx.doi.org/10.1364/oe.20.029605.

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46

Huang, Jin, Jining Li, Yue Yang, Jie Li, Jiahui Li, Yating Zhang, and Jianquan Yao. "Active controllable bandwidth of THz metamaterial bandpass filter based on vanadium dioxide." Optics Communications 465 (June 2020): 125616. http://dx.doi.org/10.1016/j.optcom.2020.125616.

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47

Li, Chuan, Zhongyin Xiao, Wei Li, and Huanling Zou. "Tunable multiband band-stop filter based on graphene metamaterial in THz frequency." Journal of Electromagnetic Waves and Applications 32, no. 18 (September 10, 2018): 2481–89. http://dx.doi.org/10.1080/09205071.2018.1518161.

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48

Dmitriev, Victor, Clerisson Nascimento, Roberto Lima, and Sergey L. Prosvirnin. "Controllable frequency and polarization THz filter based on graphene fish-scale metamaterial." Microwave and Optical Technology Letters 59, no. 12 (September 22, 2017): 3115–18. http://dx.doi.org/10.1002/mop.30889.

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49

Tybussek, Kai-Henning, Kevin Kolpatzeck, Vladyslav Cherniak, Sebastian Engelbrecht, Bernd Fischer, and Jan C. Balzer. "Spectral Shaping of a Superluminescent Diode for Terahertz Cross-Correlation Spectroscopy." Applied Sciences 12, no. 4 (February 9, 2022): 1772. http://dx.doi.org/10.3390/app12041772.

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After 20 years of terahertz cross-correlation spectroscopy (THz-CCS), the performance of the systems has been improved to practical relevance by reaching a bandwidth of ~2 THz. For the development of high-performance THz-CCS systems, it is necessary to get a deeper knowledge of the signal generation from incoherent light sources. In this work, the bandwidth, dynamic range, and peak-to-peak amplitude of a THz-CCS systems using a superluminescent diode as light source and a programmable optical filter for spectral shaping was investigated to obtain a better understanding of the relationship between the optical spectrum and the generated terahertz spectrum. By a periodic structuring of the continuous optical spectrum, an enhancement of the peak dynamic range of more than 10 dB was achieved with a bandwidth of 1.6 THz. The experimental results are confirmed by numerical simulations.

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Esakkimuthu, Manikandan, Inbarani Jothinayagam, Karthigeyan Arumugam, Sheena Christabel Pravin, and Mukesh Jewariya. "Flexible and Polarization Independent Miniaturized Double-Band/Broadband Tunable Metamaterial Terahertz Filter." Materials 15, no. 22 (November 17, 2022): 8174. http://dx.doi.org/10.3390/ma15228174.

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In this paper, the design of a double-band terahertz metamaterial filter with broadband characteristics using a single conducting layer is presented. The design uses a structured top metallic layer over a polyimide material. The proposed design has achieved broadband band-pass transmission characteristics at the resonances of 0.5 THz and 1.65 THz, respectively. The 3-dB bandwidths for these two resonances are 350 GHz and 700 GHz, respectively, which indicates that dual-band resonance with broadband transmission characteristics was obtained. The design has achieved the same transmission characteristics for two different orthogonal polarizations, which was confirmed using numerical simulation. The design was tested for a different angle of incidences and it was observed that this results in angle-independent transmission behavior. In addition, for obtaining tunable resonant behavior, the top conductor layer was replaced by graphene material and a silicon substrate was added below the polymer layer. By varying the Fermi level of graphene, modulation in amplitude and phase was observed in numerical simulation. The physical mechanism of double-band behavior was further confirmed by surface current distribution. The proposed design is simple to fabricate, compact, i.e., the size is λ0/8, and obtained dual-band/broadband operation.

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