Helico-conical vector beams

Edgar Medina-Segura

doi:10.1364/OL.497773

Helico-conical vector beams

2023-09-13

7

PRE

AI

E

Edgar Medina-Segura

L

Leonardo Miranda-Culin

V

Valeria Rodríguez-Fajardo

B

Benjamin Perez-García

C

Carmelo Rosales‐Guzmán *

DOI：10.1364/OL.497773

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Abstract

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In this work, we propose and demonstrate experimentally a new family of vector beams, the helico-conical vector beams (HCVBs), whose spatial degree of freedom is encoded in the helico-conical optical beams. We use Stokes polarimetry to study their properties and find that upon propagation their transverse polarization distribution evolves from nonhomogeneous to quasihomogeneous, such that even though their global degree of nonseparability remains constant, locally it decreases to a minimum value as z -> infinity. We corroborated this quantitatively using the Hellinger distance, a novel metric for vectorness that applies to spatially disjoint vector modes. To the best of our knowledge, HCVBs are the second family of vector beams featuring this behavior, paving the way for applications in optical tweezing or information encryption.(c) 2023 Optica Publishing Group

Keywords:

POLARIZATION STATE

OPTICAL BEAMS

BESSEL BEAMS

FREE-SPACE

PHASE

GENERATION

DYNAMICS

MODES

GAUSS

Helico-conical vector beams

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