微波磁电场
Microwave magnetoelectric fields
摘要：
我们证明了在无源微波场的亚波长区域中，时变电场和磁场之间存在不同于规则传播的自由空间电磁波中的电磁耦合的局部耦合场结构。为了将这种场结构与常规的电磁场结构区分开来，我们将其称为磁电场。研究了微波电磁场近场的结构和守恒律。我们表明，存在微波ME近场的源-ME粒子。这些粒子是由小的准二维铁氧体磁盘磁偶极振荡光谱。近场起源于这样的粒子的特点是拓扑独特的功率流涡，非零螺旋度，和扭转自由度。我们的研究微波ME近场结合在两个连续的文件。本文给出了铁氧体颗粒内外电场和磁场性质的理论背景，并给出了磁偶极振荡谱导致微波ME近场出现的原因。基于所获得的ME近场结构，我们讨论了在人工电磁材料中观察到的所谓ME相互作用的影响。在接下来的论文中，我们代表了微波ME近场及其与物质的相互作用的数值和实验研究。
英文摘要：
We show that in a source-free subwavelength region of microwave fields there can exist the field structures with local coupling between the time-varying electric and magnetic fields differing from the electric-magnetic coupling in regular-propagating free-space electromagnetic waves. To distinguish such field structures from regular electromagnetic (EM) field structures, we term them as magnetoelectric (ME) fields. We study a structure and conservation laws of microwave ME near fields. We show that there exist sources of microwave ME near fields - the ME particles. These particles are represented by small quasi-2D ferrite disks with the magnetic-dipolar-oscillation spectra. The near fields originated from such particles are characterized by topologically distinctive power-flow vortices, non-zero helicity, and a torsion degree of freedom. Our studies of the microwave ME near fields are combined in two successive papers. In this paper we give a theoretical background of properties of the electric and magnetic fields inside and outside of a ferrite particle with magnetic-dipolar-oscillation spectra resulting in appearance of the microwave ME near fields. Based on the obtained structures of the ME near fields, we discuss effects of so-called ME interactions observed in artificial electromagnetic materials. In the next paper, we represent numerical and experimental studies of the microwave ME near fields and their interactions with matter.
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