Calculation of focusing properties of a radially polarized beam with annular intensity distribution

M. Niwa, Y. Kozawa, S. Sato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A tightly focused radially polarized beam is known to produce a smaller focal spot mainly composing of longitudinal electric field near the focal point. The bright spot near the focal point can be disappeared by the interference with an additional optical field with a phase shift, and this region or dark spot is expected to be used to applications such as optical trapping and particle guiding [1]. Furthermore, a radially polarized beam with an annular intensity pattern is expected to form a much smaller spot. In this report, we demonstrate the calculation of the focusing properties of a radially polarized beam with a narrow intensity annulus, which is less than 1/40th of its beam radius, as well as a spiral phase shift corresponding to the topological charge m = 1 and 2 based on the vector diffraction theory [2]. The calculation shows that the radially polarized beam with spiral phase shift forms a hollow with a narrow width around the beam axis. In addition, the results is compared to that for an azimuthally polarized beam with an annular intensity pattern.

Original languageEnglish
Title of host publication2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011
DOIs
Publication statusPublished - 2011 Sep 6
Event2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011 - Munich, Germany
Duration: 2011 May 222011 May 26

Publication series

Name2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011

Other

Other2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011
CountryGermany
CityMunich
Period11/5/2211/5/26

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Calculation of focusing properties of a radially polarized beam with annular intensity distribution'. Together they form a unique fingerprint.

Cite this