Super-resolved pure-transverse focal fields with an enhanced energy density through focus of an azimuthally polarized first-order vortex beam

Li, X, Venugopalan, P, Ren, H, Hong, M and Gu, M 2014, 'Super-resolved pure-transverse focal fields with an enhanced energy density through focus of an azimuthally polarized first-order vortex beam', Optics Letters, vol. 39, no. 20, pp. 5961-5964.


Document type: Journal Article
Collection: Journal Articles

Title Super-resolved pure-transverse focal fields with an enhanced energy density through focus of an azimuthally polarized first-order vortex beam
Author(s) Li, X
Venugopalan, P
Ren, H
Hong, M
Gu, M
Year 2014
Journal name Optics Letters
Volume number 39
Issue number 20
Start page 5961
End page 5964
Total pages 4
Publisher Optical Society of America
Abstract We report on the experimental demonstration of super-resolved pure-transverse focal fields through focusing an azimuthally polarized first-order vortex (FOV) beam. The optimized confinement of focal fields by creating constructive interference through the superposition of the FOV on an azimuthally polarized beam is observed by both a scanning near-field microscope and a two-photon fluorescence microscope. An enhanced peak intensity of the focal spot by a factor of 1.8 has been observed compared with that of the unmodulated azimuthally polarized beam. The super-resolved and pure-transverse focal fields with a 31% reduced focal area determined by the fullwidth at half-maximum compared to that of tightly focused circular polarization is experimentally corroborated. This superiority over the circular polarization stands for any numerical aperture greater than 0.4. This technique holds the potential for applications requiring subwavelength resolution and pure-transverse fields such as highdensity optical data storage and high-resolution microscopy.
Subject Biomedical Engineering not elsewhere classified
Keyword(s) Energy density
First-order
Focal fields
Vortex beams
DOI - identifier 10.1364/OL.39.005961
Copyright notice © 2014 Optical Society of America
ISSN 0146-9592
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