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Effect of charged-particle surface excitations on near-field optics

机译：带电粒子表面激发对近场光学的影响

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The mechanism of charge on the near-field intensity distribution is revealed for metallic and dielectric particles with sizes ranging from 10 nm to 10 mu m. The theoretical foundation of near-field intensity perturbations is in the discontinuity of the tangential components of the magnetic fields on either side of the interface between the particle and its surrounding medium, since excess electrons form a thin metal-like layer with elevated conductivity. We have shown that the local fields alter marginally if charges are imposed on a surface of a metallic particle. But an intensity amplification is identified in the vicinity of charged dielectric particles with sizes smaller than the wavelength. Specifically, we have demonstrated that the electromagnetic field is amplified near the poles of the particle as a result of the oriented electric and incident fields. In contrast, a dielectric particle that is large compared to the wavelength becomes opaque with a deep shadow at the side opposite to the beam incidence. As a result, intensity damping is identified near a charged sphere in the geometric optics regime. At significant charge densities, the physical properties of a conductive layer play a dominant role in forming the 3D intensity distribution independent of conductivity or permittivity of the particle core. These findings suggest that some electrically chargeable particles have the potential to be used as optical devices with properties tunable through their net surface charge. (C) 2015 Optical Society of America
机译：对于尺寸为10 nm至10μm的金属和介电粒子，揭示了近场强度分布上的电荷机理。近场强度扰动的理论基础是粒子与周围介质之间的界面两侧的磁场切向分量的不连续，因为多余的电子形成了导电性提高的类金属薄层。我们已经表明，如果将电荷施加在金属粒子的表面上，则局部场会发生少量变化。但是，在尺寸小于波长的带电介质颗粒附近发现了强度放大。具体来说，我们已经证明，由于定向电场和入射电场的作用，电磁场在粒子的两极附近被放大。相反，与波长相比较大的电介质粒子在与射束入射相反的一侧变得不透明，并具有深阴影。结果，在几何光学方案中，在带电球体附近发现了强度衰减。在显着的电荷密度下，导电层的物理特性在形成3D强度分布方面起着主导作用，而该3D强度分布与粒子核的导电率或介电常数无关。这些发现表明，一些可带电粒子具有被用作通过其净表面电荷可调节特性的光学器件的潜力。 （C）2015年美国眼镜学会

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