Focal intensity landscapes of tightly focused spatially varying bright ellipse fields

Vector vortex beams play an important role in tailoring tightly focused fields by creating an additional longitudinal component at the focal plane. Until now, mainly focusing properties of fundamental, higher order vector fields and negative indexed ellipse fields have been investigated. In this pap...

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Bibliographic Details
Published in:Journal of optics (2010) 2022-04, Vol.24 (4), p.44013
Main Authors: Pal, Sushanta Kumar, Kumar Singh, Rakesh, Senthilkumaran, P
Format: Article
Language:English
Subjects:
C-points
optical singularity
optical vortices
polarization singularity
structured light
tight focusing
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Summary:Vector vortex beams play an important role in tailoring tightly focused fields by creating an additional longitudinal component at the focal plane. Until now, mainly focusing properties of fundamental, higher order vector fields and negative indexed ellipse fields have been investigated. In this paper we numerically analyze tight focusing behaviour of ellipse fields embedding C-point singularities of index I C = ± 1 2 , I C = ± 1 , I C = ± 3 2 and I C = ± 2 . We show that both the sign and absolute value of C-point index ( I C ) of the ellipse fields play an important role in tailoring the focal intensity landscapes. For negative index C-points the intensity distribution of the longitudinal components show symmetries that correspond to the number of separatrices present in the polarization distribution. At the focal plane, both transverse and longitudinal components of the ellipse fields are found to be embedded with phase singularities. These ellipse fields can be useful in advanced microscopy for shaping the focus of light fields for various applications.
ISSN:2040-8978
2040-8986
DOI:10.1088/2040-8986/ac56b7