IEEE Transactions on Terahertz Science and Technology最新文献_第7页

Sensitivity Enhancement of Cubic Nonlinearity Measurement in THz Frequency Range 太赫兹频率范围内立方非线性测量的灵敏度提升

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-07-09 DOI: 10.1109/TTHZ.2024.3425059

Alexandra Nabilkova;Azat Ismagilov;Maksim Melnik;Daniil Gushchin;Maria Zhukova;Mikhail Guselnikov;Sergey Kozlov;Anton Tcypkin

{"title":"Sensitivity Enhancement of Cubic Nonlinearity Measurement in THz Frequency Range","authors":"Alexandra Nabilkova;Azat Ismagilov;Maksim Melnik;Daniil Gushchin;Maria Zhukova;Mikhail Guselnikov;Sergey Kozlov;Anton Tcypkin","doi":"10.1109/TTHZ.2024.3425059","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3425059","url":null,"abstract":"The study applies for the first time the eclipse Z-scan technique to measure LiNbO\u0000<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>\u0000 crystal's nonlinear refractive index coefficient in the THz range. This technique is by one order of magnitude more sensitive than the conventional Z-scan method. The obtained value of LiNbO\u0000<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>\u0000 nonlinear refractive index coefficient is estimated to be 5 \u0000<inline-formula><tex-math>$pm , 2times 10^{-11}$</tex-math></inline-formula>\u0000 cm\u0000<inline-formula><tex-math>$^{2}$</tex-math></inline-formula>\u0000/W, which is commensurate with the established results. This value correlates with the theoretically calculated nonlinear refractive index coefficient of vibrational nature. The influence of thermal nonlinearity on the experimental results can be neglected, since the estimated refractive index change induced by temperature \u0000<inline-formula><tex-math>$Delta n{text{th}}$</tex-math></inline-formula>\u0000 equals 2.6 \u0000<inline-formula><tex-math>$times, 10^{-5}$</tex-math></inline-formula>\u0000, while the contribution \u0000<inline-formula><tex-math>$Delta n_{nl}$</tex-math></inline-formula>\u0000 from optical nonlinearity is 2.9 \u0000<inline-formula><tex-math>$times, 10^{-3}$</tex-math></inline-formula>\u0000. The demonstrated heightened sensitivity of eclipse Z-scan holds promise for the evaluation of properties of materials with lower nonlinear refractive index coefficients, thus expanding the method applicability in characterizing various nonlinear optical materials.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"718-724"},"PeriodicalIF":3.9,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142159974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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IEEE Women in Engineering 电气和电子工程师学会工程界妇女

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-07-02 DOI: 10.1109/TTHZ.2024.3419290

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IEEE Transactions on Terahertz Science and Technology Information for Authors 太赫兹科学与技术》（IEEE Transactions on Terahertz Science and Technology）作者须知

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-07-02 DOI: 10.1109/TTHZ.2024.3419309

引用次数: 0

TechRxiv: Share Your Preprint Research with the World! TechRxiv：与世界分享您的预印本研究成果！

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-07-02 DOI: 10.1109/TTHZ.2024.3419311

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IEEE Transactions on Terahertz Science and Technology Publication Information 电气和电子工程师学会太赫兹科学与技术论文集》出版信息

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-07-02 DOI: 10.1109/TTHZ.2024.3414771

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IEEE Microwave Theory and Techniques Society Information 电气和电子工程师学会微波理论与技术协会信息

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-07-02 DOI: 10.1109/TTHZ.2024.3414769

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IEEE Open Access Publishing IEEE 开放存取出版

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-07-02 DOI: 10.1109/TTHZ.2024.3419313

引用次数: 0

2-D Fixed-Frequency Terahertz Beam Steering With Microactuated Leaky-Wave Structure 采用微动漏波结构的二维固定频率太赫兹波束转向装置

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-28 DOI: 10.1109/TTHZ.2024.3420760

Naoki Tanaka;Yasuaki Monnai

{"title":"2-D Fixed-Frequency Terahertz Beam Steering With Microactuated Leaky-Wave Structure","authors":"Naoki Tanaka;Yasuaki Monnai","doi":"10.1109/TTHZ.2024.3420760","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3420760","url":null,"abstract":"As the demand for high-speed communications grows, terahertz waves emerge as a promising frontier for 6G and beyond, offering unprecedented bandwidths. However, their shorter wavelengths result in significantly higher diffraction losses compared to microwaves, necessitating innovative solutions for directional beam steering to counteract these losses. Conventional large-aperture phased arrays face challenges at terahertz frequencies due to the lack of practical phase shifters. To address this challenge, this study introduces a novel 2-D beam steering technique employing a microdisplacement controlled leaky-wave structure. By exploiting the dispersion relation of waves propagating between quasiparallel metal plates, we effectively manipulate the wave trajectory and launch angle via precise displacement and tilt of the plates. Our experimental demonstration achieves effective 2-D terahertz beam steering, eliminating the need for frequency sweeping. At 280 GHz, we achieve a steering range of \u0000<inline-formula><tex-math>${bf pm ! 37^{circ }}$</tex-math></inline-formula>\u0000 horizontally with a plate tilt of \u0000<inline-formula><tex-math>${bf pm 0.169^circ }$</tex-math></inline-formula>\u0000 and \u0000<inline-formula><tex-math>${bf 18^{circ }}$</tex-math></inline-formula>\u0000 vertically with a plate translation of 0.2 mm, along with a 3 dB frequency bandwidth of 9.7 GHz and a 10 dB bandwidth of 17.3 GHz. This method not only circumvents the limitations posed by the lack of phase shifters but also facilitates integration into compact, planar systems without expanding the physical profile. This result paves the way for directionally agile terahertz communications, enabling real-time user and device tracking capabilities.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"599-606"},"PeriodicalIF":3.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Occlusion Removal in Terahertz Frequency-Modulated Continuous Wave Nondestructive Testing Based on Inpainting 基于涂色技术的太赫兹频率调制连续波无损检测中的遮挡去除技术

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-26 DOI: 10.1109/TTHZ.2024.3419435

Bin Liang;Tianyi Wang;Sishi Shen;Congjing Hao;Defeng Liu;Jinsong Liu;Kejia Wang;Zhengang Yang

{"title":"Occlusion Removal in Terahertz Frequency-Modulated Continuous Wave Nondestructive Testing Based on Inpainting","authors":"Bin Liang;Tianyi Wang;Sishi Shen;Congjing Hao;Defeng Liu;Jinsong Liu;Kejia Wang;Zhengang Yang","doi":"10.1109/TTHZ.2024.3419435","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3419435","url":null,"abstract":"Terahertz frequency-modulated continuous wave is an effective tool for nondestructive testing. Occlusion is one of the bottlenecks of current imaging techniques for the nondestructive testing of complex objects. In reflective imaging, surface objects can cause information occlusion of deep defects in the detection direction, thus decreasing the effectiveness of nondestructive testing. In this article, a method of occlusion removal is proposed by using the layered imaging capability of frequency-modulated continuous wave systems. A specific mask is generated from the image of the surface layer, which can cover the shading on the image of the layer behind it. After an isophote-driven, exemplar-based synthetic inpainting process, the effect of the occlusion can be eliminated and the images of each layer can be restored. It is important to note that deep objects cannot be completely occluded and the deep image should have enough feature information for successful restoration. To demonstrate this, we successfully restored the occluded images from overlapping multilayer samples and validated the method in real scenes. The quantitative computational results show that the proposed method can effectively remove the occlusion and restore the images of each layer. The method provides a practical solution to the problem of occlusion that arises in the application field of nondestructive testing for any objects with multiple layers.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"699-707"},"PeriodicalIF":3.9,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Terahertz Components by Additive Manufacturing: Material and Fabrication Characterizations Realized Through Bragg Structures 通过增材制造实现太赫兹组件：通过布拉格结构实现材料和制造特性分析

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-06-26 DOI: 10.1109/TTHZ.2024.3419080

C. Harrison Brodie;Isaac Spotts;Christopher M. Collier

{"title":"Terahertz Components by Additive Manufacturing: Material and Fabrication Characterizations Realized Through Bragg Structures","authors":"C. Harrison Brodie;Isaac Spotts;Christopher M. Collier","doi":"10.1109/TTHZ.2024.3419080","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3419080","url":null,"abstract":"This work explores Bragg structures and superstructures for the terahertz regime that are 3-D printed with two filament materials, i.e., high-impact polystyrene (HIPS) and cyclic olefin copolymer (COC). We show underlying frequency responses that come about due to the material absorption and chosen 3-D printing resolution. A terahertz time-domain spectroscopy analysis shows the favorable low absorption coefficient of COC filament material compared to that of HIPS filament material. Through a demonstration of terahertz Bragg superstructures for both HIPS and COC filament material, we show the contrast in performance and mitigation of undesired absorption for a terahertz photonic element made from COC filament material. The experimental results show agreement with a finite-difference time-domain simulation of the terahertz Bragg superstructures. Through a demonstration of terahertz Bragg structures for both HIPS and COC filament material, we show the effect of printing resolution (over 50–400 μm range) of the terahertz spectral response. Terahertz Bragg structures and superstructures made from COC filament material show great promise for rapid prototyping of terahertz photonic elements.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"745-757"},"PeriodicalIF":3.9,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142159828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0