Role of the normal polarization in the far-field subwavelength imaging granted by a dielectric microsphere or microcylinder is discussed and the hypotheses explaining this experimental fact are suggested. One of these hypotheses is confirmed by exact numerical simulations. This mechanism of the magnifying superlens operation is based on the excitation of creeping waves at a curved dielectric interface by a normally polarized dipole. The set of creeping waves after their ejection from the surface creates an imaging beam which may mimic either a Bessel beam or a Mathieu beam depending on the microparticle radius. This mechanism corresponds to the asymmetric coherent illumination.

中文翻译：

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法向偏振在电介质微球或微圆柱远场亚波长成像中的作用

讨论了正常极化在由电介质微球或微圆柱体授予的远场亚波长成像中的作用，并提出了解释这一实验事实的假设。这些假设之一通过精确的数值模拟得到证实。这种放大超透镜操作的机制是基于在弯曲的介电界面上由正常极化的偶极子激发的蠕动波。一组蠕动波从表面射出后会产生成像光束，根据微粒半径，该光束可以模拟贝塞尔光束或马修光束。这种机制对应于非对称相干照明。