Journal ArticleDOI
The focus of light - theoretical calculation and experimental tomographic reconstruction
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TLDR
In this article, numerical calculations on the field distribution in the focus of an optical system with high numerical aperture are presented, where diffraction integrals based on the Debye approximation are derived and evaluated for a radially polarized input field with a doughnut-shaped intensity distribution.Abstract:
We present numerical calculations on the field distribution in the focus of an optical system with high numerical aperture. The diffraction integrals which are based on the Debye approximation are derived and evaluated for a radially polarized input field with a doughnut-shaped intensity distribution. It is shown that this mode focusses down to a spot size significantly smaller as compared to the case of linear polarization. An experimental setup to measure the three-dimensional intensity distribution in the focal region is presented, which is based on the knife-edge method and on tomographic reconstruction.read more
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Journal ArticleDOI
Focus shaping using cylindrical vector beams
Qiwen Zhan,James R. Leger +1 more
TL;DR: A focus shaping technique using generalized cylindrical vector beams that can be tailored by appropriately adjusting the rotation angle to obtain peak-centered, donut and flattop focal shapes is reported.
Journal ArticleDOI
Annular Pupils, Radial Polarization, and Superresolution
TL;DR: An annular pupil, which can be used to produce a Bessel beam, when combined with radially polarized illumination promises improvements in microscope resolution, increased packing density for optical storage, and finer optical lithography.
Journal ArticleDOI
Optical angular-momentum flux*
TL;DR: In this paper, the angularmomentum flux is defined as the flow of angular momentum across a surface and, in conjunction with the more familiar angular momentum density, expresses angular momentum conservation.
Journal ArticleDOI
Nanointerferometric amplitude and phase reconstruction of tightly focused vector beams
TL;DR: In this paper, an easily implementable reconstruction scheme is demonstrated for determining the full vectorial amplitude and relative phase distributions of highly confined electromagnetic fields with subwavelength resolution from a single-scan measurement.
Journal ArticleDOI
Dark-field imaging with cylindrical-vector beams
TL;DR: A through-focus comparison of azimuthal and radial polarization shows a measurable dependence of edge separation on polarization.
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