We report the study of light polarization property upon scattering off a dielectric nanorod in which the direction of the incident light is at an angle with respect to the cylinder main axis. The numerical work is done on the basis of the cylindrical Mie theory. It is shown that for incident light with different polarization, the resulted scattering cross-section spectra will also show different characteristics with varying incident angles. For TE case, resonance splitting is observed due to excitation of a new resonance mode, while for TM case, resonance merging is observed. An interference effect between different resonance modes due to variation of incident angle is then resulted in suppression of backward scattering intensity for TM case. Meanwhile, for TE case, at illumination angle approaching grazing angle, a spectral range exists whereby the scattered wave’s angular intensity profile forms a perpendicular dipolar feature with different polarization. The reported results may be useful for aplication of nanoantenna, photovoltaic, and polarization conversion.

中文翻译：

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斜入射角介电纳米棒上散射光的偏振特性

我们报告了对电介质纳米棒散射后的光偏振特性的研究，其中入射光的方向与圆柱体主轴成一定角度。数值工作是在圆柱 Mie 理论的基础上完成的。结果表明，对于不同偏振的入射光，所得到的散射截面光谱也会随着入射角的变化而呈现出不同的特性。对于 TE 情况，由于新的共振模式的激发，观察到共振分裂，而对于 TM 情况，观察到共振合并。由于入射角的变化，不同共振模式之间的干涉效应会导致对 TM 情况的后向散射强度的抑制。同时，对于 TE 情况，在照射角接近掠射角时，存在一个光谱范围，由此散射波的角强度分布形成具有不同偏振的垂直偶极特征。报告的结果可能对纳米天线、光伏和偏振转换的应用有用。