Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices

Kayn Forbes; Garth Jones

doi:10.1117/12.2605929

Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices

Kayn Forbes, Garth Jones

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

26 Downloads (Pure)

Abstract

Optical fields possess energy, momentum, and helicity. For the plane waves and paraxial fields of standard, classical optics, the spin angular momentum and optical helicity are well understood, both being proportional to the degree of circular polarization. In contrast, 3D non-paraxial optical fields generated by spatial confinement, such as tight focusing and evanescent waves, may possess spin angular momentum and optical helicity when the degree of 2D-circular polarization is zero. In this work using quantum electrodynamics we highlight two novel properties of non-paraxial optical vortices 1) a non-zero optical helicity (chirality) density for 2D-unpolarized (and 2D-linearly polarized) 3D optical vortices and 2) a longitudinal spin angular momentum density for 2D-linearly polarized 3D optical vortices.

Original language	English
Title of host publication	Complex Light and Optical Forces XVI
Editors	David L. Andrews, Enrique J. Galvez, Halina Rubinsztein-Dunlop
Place of Publication	San Francisco, California, United States
Publisher	SPIE Press
Volume	XVI
ISBN (Electronic)	9781510649057
DOIs	https://doi.org/10.1117/12.2605929
Publication status	Published - 2 Mar 2022

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	12017
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Keywords

Optical helicity
chirality
optical angular momentum nanophotonics
optical chirality
spin angular momentum
structured light
twisted light

Access to Document

10.1117/12.2605929

Published manuscriptFinal published version, 542 KBLicence: CC BY-NC

Cite this

Forbes, K., & Jones, G. (2022). Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices. In D. L. Andrews, E. J. Galvez, & H. Rubinsztein-Dunlop (Eds.), Complex Light and Optical Forces XVI (Vol. XVI). [1201708] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 12017). SPIE Press. https://doi.org/10.1117/12.2605929

Forbes, Kayn ; Jones, Garth. / Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices. Complex Light and Optical Forces XVI. editor / David L. Andrews ; Enrique J. Galvez ; Halina Rubinsztein-Dunlop. Vol. XVI San Francisco, California, United States : SPIE Press, 2022. (Proceedings of SPIE - The International Society for Optical Engineering).

@inproceedings{64cbf905e64c47ffbab0674e346e120a,

title = "Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices",

abstract = "Optical fields possess energy, momentum, and helicity. For the plane waves and paraxial fields of standard, classical optics, the spin angular momentum and optical helicity are well understood, both being proportional to the degree of circular polarization. In contrast, 3D non-paraxial optical fields generated by spatial confinement, such as tight focusing and evanescent waves, may possess spin angular momentum and optical helicity when the degree of 2D-circular polarization is zero. In this work using quantum electrodynamics we highlight two novel properties of non-paraxial optical vortices 1) a non-zero optical helicity (chirality) density for 2D-unpolarized (and 2D-linearly polarized) 3D optical vortices and 2) a longitudinal spin angular momentum density for 2D-linearly polarized 3D optical vortices.",

keywords = "Optical helicity, chirality, optical angular momentum nanophotonics, optical chirality, spin angular momentum, structured light, twisted light",

author = "Kayn Forbes and Garth Jones",

note = "Funding Information: KAF thanks the Leverhulme Trust for funding him through a Leverhulme Early Career Fellowship ECF-2019-398.",

year = "2022",

month = mar,

day = "2",

doi = "10.1117/12.2605929",

language = "English",

volume = "XVI",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

publisher = "SPIE Press",

editor = "Andrews, {David L.} and Galvez, {Enrique J.} and Halina Rubinsztein-Dunlop",

booktitle = "Complex Light and Optical Forces XVI",

}

Forbes, K & Jones, G 2022, Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices. in DL Andrews, EJ Galvez & H Rubinsztein-Dunlop (eds), Complex Light and Optical Forces XVI. vol. XVI, 1201708, Proceedings of SPIE - The International Society for Optical Engineering, vol. 12017, SPIE Press, San Francisco, California, United States. https://doi.org/10.1117/12.2605929

Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices. / Forbes, Kayn ; Jones, Garth.

Complex Light and Optical Forces XVI. ed. / David L. Andrews; Enrique J. Galvez; Halina Rubinsztein-Dunlop. Vol. XVI San Francisco, California, United States : SPIE Press, 2022. 1201708 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 12017).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices

AU - Forbes, Kayn

AU - Jones, Garth

N1 - Funding Information: KAF thanks the Leverhulme Trust for funding him through a Leverhulme Early Career Fellowship ECF-2019-398.

PY - 2022/3/2

Y1 - 2022/3/2

N2 - Optical fields possess energy, momentum, and helicity. For the plane waves and paraxial fields of standard, classical optics, the spin angular momentum and optical helicity are well understood, both being proportional to the degree of circular polarization. In contrast, 3D non-paraxial optical fields generated by spatial confinement, such as tight focusing and evanescent waves, may possess spin angular momentum and optical helicity when the degree of 2D-circular polarization is zero. In this work using quantum electrodynamics we highlight two novel properties of non-paraxial optical vortices 1) a non-zero optical helicity (chirality) density for 2D-unpolarized (and 2D-linearly polarized) 3D optical vortices and 2) a longitudinal spin angular momentum density for 2D-linearly polarized 3D optical vortices.

AB - Optical fields possess energy, momentum, and helicity. For the plane waves and paraxial fields of standard, classical optics, the spin angular momentum and optical helicity are well understood, both being proportional to the degree of circular polarization. In contrast, 3D non-paraxial optical fields generated by spatial confinement, such as tight focusing and evanescent waves, may possess spin angular momentum and optical helicity when the degree of 2D-circular polarization is zero. In this work using quantum electrodynamics we highlight two novel properties of non-paraxial optical vortices 1) a non-zero optical helicity (chirality) density for 2D-unpolarized (and 2D-linearly polarized) 3D optical vortices and 2) a longitudinal spin angular momentum density for 2D-linearly polarized 3D optical vortices.

KW - Optical helicity

KW - chirality

KW - optical angular momentum nanophotonics

KW - optical chirality

KW - spin angular momentum

KW - structured light

KW - twisted light

UR - http://www.scopus.com/inward/record.url?scp=85130420759&partnerID=8YFLogxK

U2 - 10.1117/12.2605929

DO - 10.1117/12.2605929

M3 - Conference contribution

VL - XVI

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Complex Light and Optical Forces XVI

A2 - Andrews, David L.

A2 - Galvez, Enrique J.

A2 - Rubinsztein-Dunlop, Halina

PB - SPIE Press

CY - San Francisco, California, United States

ER -

Forbes K , Jones G. Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices. In Andrews DL, Galvez EJ, Rubinsztein-Dunlop H, editors, Complex Light and Optical Forces XVI. Vol. XVI. San Francisco, California, United States: SPIE Press. 2022. 1201708. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2605929

Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices

Abstract

Publication series

Keywords

Access to Document

Other files and links

Quantum theory for advanced molecular photonics: structured light and plasmonics

Cite this

Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices

Abstract

Publication series

Keywords

Access to Document

Other files and links

Projects

Quantum theory for advanced molecular photonics: structured light and plasmonics

Cite this