Electromagnetic waves (Cambridge, Mass.)最新文献

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Polarization-wavelength Locked Plasmonic Topological States 偏振波长锁定等离子体拓扑态
Electromagnetic waves (Cambridge, Mass.) Pub Date : 2023-01-01 DOI: 10.2528/pier23081008
Yuan-Zhen Li, Zijian Zhang, Hongsheng Chen, Fei Gao
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引用次数: 0
High-accuracy Rapid Identification and Classification of Mixed Bacteria Using Hyperspectral Transmission Microscopic Imaging and Machine Learning 利用高光谱透射显微成像和机器学习对混合细菌进行高精度快速鉴定和分类
Electromagnetic waves (Cambridge, Mass.) Pub Date : 2023-01-01 DOI: 10.2528/pier23082303
He Zhu, Jing Luo, Jiaqi Liao, Sailing He
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引用次数: 0
Linear Sampling Method Imaging of Three-dimensional Conducting Targets from Limited Apertures via Phase-delay-constrained Formulations 基于相位延迟约束公式的有限孔径三维导电目标线性采样成像方法
Electromagnetic waves (Cambridge, Mass.) Pub Date : 2023-01-01 DOI: 10.2528/pier23040504
Matthew Burfeindt, Hatim F. Alqadah
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引用次数: 0
On the Convergence of Numerical Computations for Both Exact and Approximate Solutions for Electromagnetic Scattering by Nonspherical Dielectric Particles. 非球形介电粒子电磁散射精确解和近似解数值计算的收敛性。
Ping Yang, Jiachen Ding, Richard Lee Panetta, Kuo-Nan Liou, George W Kattawar, Michael Mishchenko
{"title":"On the Convergence of Numerical Computations for Both Exact and Approximate Solutions for Electromagnetic Scattering by Nonspherical Dielectric Particles.","authors":"Ping Yang,&nbsp;Jiachen Ding,&nbsp;Richard Lee Panetta,&nbsp;Kuo-Nan Liou,&nbsp;George W Kattawar,&nbsp;Michael Mishchenko","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>We summarize the size parameter range of the applicability of four light-scattering computational methods for nonspherical dielectric particles. These methods include two exact methods - the extended boundary condition method (EBCM) and the invariant imbedding T-matrix method (II-TM) and two approximate approaches - the physical-geometric optics method (PGOM) and the improved geometric optics method (IGOM). For spheroids, the single-scattering properties computed by EBCM and II-TM agree for size parameters up to 150, and the comparison gives us confidence in using IITM as a benchmark for size parameters up to 150 for other geometries (e.g., hexagonal columns) because the applicability of II-TM with respect to particle shape is generic, as demonstrated in our previous studies involving a complex aggregate. This study demonstrates the convergence of the exact II-TM and approximate PGOM solutions for the complete set of single-scattering properties of a nonspherical shape other than spheroids and circular cylinders with particle sizes of <i>~</i> 48λ(size parameter ~150), specifically a hexagonal column with a length size parameter of <i>kL</i> = 300 where <i>k</i> = 2π<i>/</i>λ and <i>L</i> is the column length. IGOM is also quite accurate except near the exact 180°backscattering direction. This study demonstrates that a synergetic combination of the numerically-exact II-TM and the approximate PGOM can seamlessly cover the entire size parameter range of practical interest. To demonstrate the applicability of the approach, we compute the optical properties of dust particles and demonstrate a downstream application to the retrieval of dust aerosol optical thickness and effective particle size from satellite polarimetric observations.</p>","PeriodicalId":90819,"journal":{"name":"Electromagnetic waves (Cambridge, Mass.)","volume":"164 ","pages":"27-61"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6398966/pdf/nihms-1521888.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37210278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the Convergence of Numerical Computations for Both Exact and Approximate Solutions for Electromagnetic Scattering by Nonspherical Dielectric Particles. 非球形介电粒子电磁散射精确解和近似解数值计算的收敛性。
Electromagnetic waves (Cambridge, Mass.) Pub Date : 2019-01-01 DOI: 10.2528/PIER18112810
P. Yang, Jiachen Ding, R. Panetta, K. Liou, G. Kattawar, M. Mishchenko
{"title":"On the Convergence of Numerical Computations for Both Exact and Approximate Solutions for Electromagnetic Scattering by Nonspherical Dielectric Particles.","authors":"P. Yang, Jiachen Ding, R. Panetta, K. Liou, G. Kattawar, M. Mishchenko","doi":"10.2528/PIER18112810","DOIUrl":"https://doi.org/10.2528/PIER18112810","url":null,"abstract":"We summarize the size parameter range of the applicability of four light-scattering computational methods for nonspherical dielectric particles. These methods include two exact methods - the extended boundary condition method (EBCM) and the invariant imbedding T-matrix method (II-TM) and two approximate approaches - the physical-geometric optics method (PGOM) and the improved geometric optics method (IGOM). For spheroids, the single-scattering properties computed by EBCM and II-TM agree for size parameters up to 150, and the comparison gives us confidence in using IITM as a benchmark for size parameters up to 150 for other geometries (e.g., hexagonal columns) because the applicability of II-TM with respect to particle shape is generic, as demonstrated in our previous studies involving a complex aggregate. This study demonstrates the convergence of the exact II-TM and approximate PGOM solutions for the complete set of single-scattering properties of a nonspherical shape other than spheroids and circular cylinders with particle sizes of ~ 48λ(size parameter ~150), specifically a hexagonal column with a length size parameter of kL = 300 where k = 2π/λ and L is the column length. IGOM is also quite accurate except near the exact 180°backscattering direction. This study demonstrates that a synergetic combination of the numerically-exact II-TM and the approximate PGOM can seamlessly cover the entire size parameter range of practical interest. To demonstrate the applicability of the approach, we compute the optical properties of dust particles and demonstrate a downstream application to the retrieval of dust aerosol optical thickness and effective particle size from satellite polarimetric observations.","PeriodicalId":90819,"journal":{"name":"Electromagnetic waves (Cambridge, Mass.)","volume":"164 1","pages":"27-61"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2528/PIER18112810","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69433527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 28
Photoacoustic tomography: principles and advances. 光声断层扫描:原理与进展。
Electromagnetic waves (Cambridge, Mass.) Pub Date : 2014-01-01 DOI: 10.2528/pier14032303
Jun Xia, Junjie Yao, Lihong V Wang
{"title":"Photoacoustic tomography: principles and advances.","authors":"Jun Xia, Junjie Yao, Lihong V Wang","doi":"10.2528/pier14032303","DOIUrl":"10.2528/pier14032303","url":null,"abstract":"<p><p>Photoacoustic tomography (PAT) is an emerging imaging modality that shows great potential for preclinical research and clinical practice. As a hybrid technique, PAT is based on the acoustic detection of optical absorption from either endogenous chromophores, such as oxy-hemoglobin and deoxy-hemoglobin, or exogenous contrast agents, such as organic dyes and nanoparticles. Because ultrasound scatters much less than light in tissue, PAT generates high-resolution images in both the optical ballistic and diffusive regimes. Over the past decade, the photoacoustic technique has been evolving rapidly, leading to a variety of exciting discoveries and applications. This review covers the basic principles of PAT and its different implementations. Strengths of PAT are highlighted, along with the most recent imaging results.</p>","PeriodicalId":90819,"journal":{"name":"Electromagnetic waves (Cambridge, Mass.)","volume":"147 ","pages":"1-22"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4311576/pdf/nihms610461.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33020761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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