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Comparison of the time-domain electromagnetic field from an infinitesimal point charge and dipole source

Applied Geophysics 2013年第3期10卷 349-356,359页

作者：周楠楠薛国强王贺元中国科学院矿产资源研究重点实验室中国科学院地质与地球物理研究所北京100029 辽宁工业大学理学院锦州121001

An electromagnetic field is generated through the accelerating movement of two equal but opposite charges of a single dipole. An electromagnetic field can also be generated by a time-varying infinitesimal point charge. In this study, a comparison between the electromagnetic fields of an infinitesimal point charge and a dipole has been presented. First, the time-domain potential function of a point source in a 3D conductive medium is derived. Then the electric and magnetic fields in a 3D homogeneous lossless space are derived via the relation between the potential and field. The field differences between the infinitesimal point charge and the dipole in the step-off time, far-source, and near-source zones are analyzed, and the accuracy of the solutions from these sources is investigated. It is also shown that the field of the infinitesimal point charge in the near-source zone is different from that of the dipole, whereas the far-source zone fields of these two sources are identical. The comparison of real and simulated data shows that the infinitesimal point charge represents the real source better than the divole source.

关键词： Infinitesimal point charge dipole source time-domain electromagnetic response near-source zone.

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dipole-fiber system： from single photon source to metadevices

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Frontiers of Optoelectronics 2018年第1期11卷 30-36页

作者： Shaghik ATAKARAMIANS Tanya M. MONRO Shahraam AFSHAR V. School of Electrical Engineering and Telecommunications The University of New South Wales Sydney NSW 2052 Australia Institute for Photonics and Advanced Sensing The University of Adelaide Adelaide SA 5005 Australia Laser Physics and Photonic Devices Laboratories School of Engineering University of South Australia Mawson Lakes SA 5095 Australia

Radiation of an electric dipole（quantum emitter）in vicinity of optical structures still attracts great interest due to emerging of novel application and technological *** we review our recent work on guided and radiation modes of electric dipole and optical fiber system and its applications from single photon source to *** demonstrate that the relative position and orientation of the dipole and the core diameter of the optical fiber are the two key defining factors of the coupled system *** demonstrate that such a coupled system has a vast span of applications in nanophotonics;a single photon source,a high-quality factor sensor and the building block of metadevices.

关键词： dipole source optical fibers single photon source whispering gallery modes electric and magnetic response

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Simulation study of a magnetocardiogram based on a virtual heart model:effect of a cardiac equivalent source and a volume conductor

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Chinese Physics B 2011年第3期20卷 121-128页

作者：寿国法夏灵马平唐发宽戴灵 Department of Biomedical Engineering Key Laboratory for Biomedical Engineering of the Ministry of EducationZhejiang University Department of Physics State Key Laboratory for Artificial Microstructure and Mesoscopic PhysicsPeking University Department of Cardiology the 309th Hospital of the People's Liberation Army

In this paper, we present a magnetocardiogram （MCG） simulation study using the boundary element method （BEM） and based on the virtual heart model and the realistic human volume conductor model. The different contributions of cardiac equivalent source models and volume conductor models to the MCG are deeply and comprehensively investigated. The single dipole source model, the multiple dipoles source model and the equivalent double layer （EDL） source model are analysed and compared with the cardiac equivalent source models. Meanwhile, the effect of the volume conductor model on the MCG combined with these cardiac equivalent sources is investigated. The simulation results demonstrate that the cardiac electrophysiological information will be partly missed when only the single dipole source is taken, while the EDL source is a good option for MCG simulation and the effect of the volume conductor is smallest for the EDL source. Therefore, the EDL source is suitable for the study of MCG forward and inverse problems, and more attention should be paid to it in future MCG studies.

关键词： virtual heart model magnetocardiogram dipole source equivalent double layer source volume conductor model

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