Numerical analysis of tiny-focal-spot generation by focusing linearly, circularly, and radially polarized beams through a micro/nanoparticle
Rui Shi (Friedrich Schiller University Jena, LightTrans International UG, Jena)
Zongzhao Wang (LightTrans International UG, Jena, Friedrich Schiller University Jena)
Shih Han Hung (TU Delft - Team Raf Van de Plas)
Christian Hellmann (Wyrowski Photonics UG, Jena)
Frank Wyrowski (Friedrich Schiller University Jena)
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Abstract
Obtaining a tiny focal spot is desired for super resolution. We do a vectorial numerical analysis of the linearly, circularly, and radidally polarized electromagnetic fields being focused through a dielectric micro/nanoparticle of size comparable to the wavelength. We find tiny focal spots (up to ∼ 0.05 λ2) can be obtained behind micro/nanoparticles of various shapes, e.g. spherical, disk-shaped, and cuboid micro/nanoparticles. Furthermore, we also investigate the influence of the misalignment of a real lens system on the tiny focal spots. We find that tiny focal spots can still be generated even though they are distorted due to the misalignment.