论文标题
通过振荡介电常数的小颗粒制成的物体散射的波浪散射
Wave scattering by objects made of small particles with oscillating permittivity
论文作者
论文摘要
微技术和纳米技术的快速发展为设计新颖的光学材料及其应用而设计的无限机会。最近，在半导体中证明了快速折射率调制的可能性。在本文中，我们通过使用局部扰动方法研究了具有定期变化的折射率的小无分散颗粒的波散射。使用的形式主义使我们能够在理论和数值上研究由由任意形状的小颗粒和振动折射指数制成的物体散射。 在这项工作中，从理论上计算了粒子群及其共振频率散布的场。此外，还提供了单个立方体和具有振荡介电常数的立方体群体对散射的数值建模的结果。结果表明，散射场及其共振频率受到振荡介电常数的显着影响：现有的共振正在转移，新的散射共振正在出现，并且在散射光谱中出现了深处。
Rapid advancements in the micro and nano-technology create unlimited opportunities for design of novel optical materials and their applications. Recently, the possibility of the fast refractive index modulation was demonstrated in semiconductors. In this paper we study the wave scattering by small dispersionless particles with periodically varying refractive index in scalar case by using the local perturbation method. The used formalism allows us to study theoretically and numerically the scattering by objects made of small particles of arbitrary shape and with oscillating refractive index. In this work, the field scattered by the cluster of the particles and its resonance frequencies are calculated theoretically. In addition, the results of the numerical modeling of the scattering by single cube and by cluster of cubes with oscillating permittivity are presented. It was shown that the scattered fields and their resonance frequencies are significantly affected by the oscillating permittivity: existing resonances are shifting, new scattering resonances are emerging, and deeps in the scattering spectrum are appearing.
