Experimental verification on tightly focused radially polarized vortex beams

Experimental verification on tightly focused radially polarized vortex beams

The theoretical and experimental results of tightly focused radially polarized vortex beams are demonstrated. An auto-focus technology is introduced into the measurement system in order to enhance the measurement precision, and the radially polarized vortex beams are generated by a liquid-crystal po...

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Veröffentlicht in:Chinese physics B 2013-06, Vol.22 (6), p.356-359
1. Verfasser: 杜富荣 周哲海 谭峭峰 杨昌喜 张晓青 祝连庆
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Sprache:eng
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Beams (radiation)
Electron beams
Fluid flow
Focusing
Mathematical analysis
Microscopy
Phase plates
Polarization
Topology
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container_title Chinese physics B
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creator 杜富荣 周哲海 谭峭峰 杨昌喜 张晓青 祝连庆
description The theoretical and experimental results of tightly focused radially polarized vortex beams are demonstrated. An auto-focus technology is introduced into the measurement system in order to enhance the measurement precision, and the radially polarized vortex beams are generated by a liquid-crystal polarization converter and a vortex phase plate. The focused fields of radially polarized vortex beams with different topological charges at numerical apertures （NAs） of 0.65 and 0.85 are measured respectively, and the results indicate that the total intensity distribution at focus is dependent not only on the NA of the focusing objective lens and polarization pattern of the beam but also on the topological charge l of the beam. Some unique focusing properties of radially polarized vortex beams with fractional topological charges are presented based on numerical calculations. The experimental verification paves the way for some practical applications of radially polarized vortex beams, such as in optical trapping, near-field microscopy, and material processing.
doi_str_mv 10.1088/1674-1056/22/6/064202
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subjects Beams (radiation)
Electron beams
Fluid flow
Focusing
Mathematical analysis
Microscopy
Phase plates
Polarization
Topology
title Experimental verification on tightly focused radially polarized vortex beams
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