Numerical analysis of tiny-focal-spot generation by focusing linearly, circularly, and radially polarized beams through a micro/nanoparticle

Rui Shi, Zongzhao Wang, Shih Te Hung, Christian Hellmann, Frank Wyrowski

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Pages (from-to)2332-2347
JournalOptics Express
Volume29
Issue number2
DOIs
Publication statusPublished - 2021

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