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Role of the normal polarization in the far-field subwavelength imaginggranted by a dielectric microsphere or microcylinder is discussed and thehypotheses explaining this experimental fact are suggested. One of thesehypotheses is confirmed by exact numerical simulations. This mechanism of themagnifying superlens operation is based on the excitation of creeping waves ata curved dielectric interface by a normally polarized dipole. The set ofcreeping waves after their ejection from the surface creates an imaging beamwhich may mimic either a Bessel beam or a Mathieu beam depending on themicroparticle radius. This mechanism corresponds to the asymmetric coherentillumination.

Role of the normal polarization in the far-field subwavelength imaging by a dielectric microsphere or microcylinder