论文标题
揭开大型电介质MIE球体的偶极光谱状态
Unveiling dipolar spectral regimes of large dielectric Mie spheres from helicity conservation
论文作者
论文摘要
控制介电颗粒散射的光的电磁螺旋和方向性对于在全电语光学和光子学中感兴趣的现象学至关重要。在这封信中，我们表明，高索引介电MIE球在散射中的电磁螺旋性可以用作纯净层光谱区域的探针，尤其是偶极性质，超出其假定的光谱间隔。这一发现表明，与当前的最新状态形成鲜明对比的是，偶极行为不一定仅限于小颗粒。有趣的是，我们证明，在小粒子极限中预测特定纳米球的最佳前向光散射条件实际上是在固定的x尺寸参数下实现的，用于无限数量的折射率。
Controlling the electromagnetic helicity and directionality of the light scattered by dielectric particles is paramount to a variety of phenomenology of interest in all-dielectric optics and photonics. In this Letter, we show that the conservation of the electromagnetic helicity in the scattering by high-index dielectric Mie spheres can be used as a probe of pure-multipolar spectral regions, particularly, of dipolar nature, beyond its presumed spectral interval. This finding reveals that the dipolar behavior is not necessarily limited to small particles, in striking contrast to the current state of the art. Interestingly, we demonstrate that the optimum forward light scattering condition, predicted for a particular nano-sphere in the limit of small particle, is fulfilled in fact at a fixed x size parameter for an infinite number of refractive indexes
