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本文基于Mie散射理论,设计并研究了具有高定向、可调谐零背向散射特性的“金属-低介电-高介电”纳米核壳结构.分析了低介电层的厚度和折射率对偶极电、磁共振位置及强度的影响,发现将偶极电和磁共振在光谱上调节到重合,满足第一Kerker条件,可以实现零背向散射和显著增强的前向散射.进一步说明通过改变核壳结构的内核厚度和外半径或高介电层的折射率,能够实现零背向散射波长的可调谐.研究结果将对设计基于零背向散射的纳米结构和器件有重要的指导意义.
Based on the Mie scattering theory, the “metal-low-k dielectric-high-k dielectrics” nano-shell structure with high orientation and tunable zero backscattering properties was designed and studied.The thickness and refraction of the low dielectric layer Rate dipole, magnetic resonance position and intensity, we found that the dipole electrical and magnetic resonance are spectrally adjusted to coincide, satisfying the first Kerker condition, enabling zero backscattering and significantly enhanced forward scattering. Further explanation The tunability of zero backscattering wavelengths can be achieved by changing the core thickness and outer radius of the core-shell structure or the refractive index of the high dielectric layer.The results of the study will provide important guidance in the design of nanostructures and devices based on zero backscatter significance.