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

Journal article (2021)

Authors

Shi Friedrich Schiller University Jena, LightTrans International UG, Jena
Wang Friedrich Schiller University Jena, LightTrans International UG, Jena
Hung Team Raf Van de Plas - Mechanical, Maritime and Materials Engineering
Hellmann Wyrowski Photonics UG, Jena
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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