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

Journal article (2021)

Authors

Rui Shi Friedrich Schiller University Jena, LightTrans International UG, Jena
Zongzhao Wang LightTrans International UG, Jena, Friedrich Schiller University Jena
S. Hung Team Raf Van de Plas - Mechanical, Maritime and Materials Engineering
Christian Hellmann Wyrowski Photonics UG, Jena
Frank Wyrowski Friedrich Schiller University Jena
Research Group
Team Raf Van de Plas (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2021 Rui Shi, Zongzhao Wang, S. Hung, Christian Hellmann, Frank Wyrowski
DOI: https://doi.org/10.1364/OE.415576
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Published Date

2021

Language

English

Reuse Rights

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Delft Center for Systems and Control

Research Group

Team Raf Van de Plas

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.

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