Super-resolution and non-diffraction longitudinal polarized beam

TL;DR

This paper introduces a method to generate a subwavelength, non-diffracting longitudinally polarized beam that maintains its shape over several wavelengths using controlled Bessel-Gaussian fields.

Contribution

It presents a novel technique for producing a highly focused, non-diffracting longitudinal polarized beam with subwavelength resolution.

Findings

Achieved a 0.43 lambda subwavelength beam

Beam propagates without divergence over about 4 lambda

Controlled amplitude, phase, and polarization on the aperture

Abstract

A method is presented for generation of a subwavelength (0.43 lambda) longitudinally polarized beam, which propagates without divergence over lengths of about 4 lambda in free space. This is achieved by controlling the amplitude, phase and polarization property of the Bessel-Gaussian field on the aperture of a high numerical aperture focusing lens.