论文标题
亚波长的效应在介电小玻璃室附近，无衍射光束照亮
Subwavelength effects near a dielectric microcylinder illuminated by a diffraction-free beam
论文作者
论文摘要
通过线性极化波束或撞击介电微圆柱的平面波的产生光子纳米夹，这意味着将传播波的部分转化为evaneScent的波。该转化率表现在亚波长有效宽度的纳米jet腰部。但是，这种已知的近场效应相对较弱。从理论上讲，我们表明，由两个平面波形成的波梁的发生率可实现更强大的近场效应：入射光束的深层次波长聚焦，以及在整个圆柱体表面及其附近的电场的强大增强。圆柱附近的渐态波的统治是由于入射波梁决定的散射场的传播空间谐波的破坏性干扰。
Generation of a photonic nanojet by a linearly polarized wave beam or a plane wave impinging a dielectric microcylinder implies partial conversion of the propagating waves into the evanescent ones. This conversion is manifested in nanojet waist of subwavelength effective width. However, this known near-field effect is relatively weak. We theoretically show that the incidence of a wave beam formed by two plane waves enables much stronger near-field effects: a deeply subwavelength focusing of the incident beam and a strong enhancement of the electric field on the whole cylinder surface and near it. The domination of the evanescent waves in the vicinity of the cylinder results from the destructive interference of the propagating spatial harmonics of the scattered field dictated by the incident wave beam.
