64 citations · 330 across the 21 of their papers we have counts for
21 papers
Dual-Symmetrized Construction of Electromagnetic Beams Beyond the Paraxial Approximation with an Explicit Separation of Scalar and Vectorial Corrections
Abdullah F. Alharbi, Kayn A. Forbes
We develop a perturbative framework for constructing the fields of electromagnetic beams beyond the paraxial approximation, in which the vectorial correction is shared symmetricall…
Transversality Locks Longitudinal Gradients in Structured-Light Quadrupole Transitions
Kayn A. Forbes, Dale Green, Abdullah F. Alharbi +1
Electric quadrupole absorption is driven by optical field gradients, not by field amplitudes alone. This distinction is crucial for structured light, where a paraxially small longi…
Orbital angular momentum control of third-harmonic generation and vortex dichroism in isotropic media
Szymon Kurkowski, Kayn A Forbes
Structured light carrying orbital angular momentum enables new regimes of nonlinear light-matter interaction. Here we develop a molecular quantum electrodynamics description of thi…
Vortex Light at the Nanoscale: Twists, Spins, and Surprises -- A Review
Kayn A Forbes
For over three decades, the study of optical vortex beams carrying orbital angular momentum (OAM) has been at the forefront of optics, driven by fundamental questions about optical…
Topological Control of Chirality and Spin with Structured Light
Light Mkhumbuza, Pedro Ornelas, Angela Dudley +2
Structured light beams with engineered topological properties offer a powerful means to control spin angular momentum (SAM) and optical chirality, key quantities shaped by spin-orb…
Generalized Polarization Matrix Approach to Near-Field Optical Chirality
Kayn A. Forbes, David L. Andrews
For paraxial light beams and electromagnetic fields, the Stokes vector and polarization matrix provide equivalent scalar measures of optical chirality, widely used in linear optics…
Generating optical angular momentum through wavefront curvature
Kayn A. Forbes, Vittorio Aita, Anatoly V. Zayats
Recent developments in the understanding of optical angular momentum have resulted in many demonstrations of unusual optical phenomena, such as optical beams with orbital angular m…
Laguerre-Gaussian modes become elegant after an azimuthal phase modulation
Vasilios Cocotos, Light Mkhumbuza, Kayn A. Forbes +3
Laguerre-Gaussian (LG) modes are solutions of the paraxial Helmholtz equation in cylindrical coordinates and are associated with light fields carrying orbital angular momentum (OAM…
Nonlinear vortex dichroism in chiral molecules
Luke Cheeseman, Kayn A Forbes
The recent discovery that linearly polarized light with a helical wavefront can exhibit vortex dichroism (also referred to as helical dichroism) has opened up new horizons in chiro…
Comment on M. Babiker, J. Yuan, K. Koksal, and V. Lembessis, Optics Communications 554, 130185 (2024)
Kayn A. Forbes
In a recent article Babiker et al. [Optics Communications , 130185 (2024)] claim that cylindrical vector beams (CVBs), also referred to as higher-order Poincaré (HOP)…
On the orbit-induced spin density of tightly focused optical vortex beams: ellipticity and helicity
Kayn A. Forbes
It has recently been established that a linearly-polarized optical vortex possesses spin angular momentum density in the direction of propagation (longitudinal spin) under tight-fo…
Spin angular momentum and optical chirality of Poincaré vector vortex beams
Kayn A. Forbes
The optical chirality and spin angular momentum of structured scalar vortex beams has been intensively studied in recent years. The pseudoscalar topological charge of these…
Topological-charge-dependent dichroism and birefringence of optical vortices
Kayn A. Forbes, Dale Green
Material anisotropy and chirality produce polarization-dependent light-matter interactions. Absorption leads to linear and circular dichroism, whereas elastic forward scattering pr…
Customized optical chirality of vortex structured light through state and degree of polarization control
Kayn A. Forbes, Dale Green
We show how both the ellipticity and degree of polarization influences the extraordinary optical chirality properties of non-paraxial vortex beams. We find that, i…
Enantioselective optical gradient forces using 3D structured vortex light
Kayn A Forbes, Dale Green
Here we highlight enantioselective optical gradient forces present in 3D structured optical vortex tweezing systems. One chiral force originates from the circular polarization of t…
Optical helicity of unpolarized light
Kayn A. Forbes
Recently arXiv:2004.02970 showed that the extraordinary transverse spin momentum density of spatially confined optical fields is largely independent of polarization. Here it is sho…
Measures of Helicity and Chirality of Optical Vortex Beams
Kayn A. Forbes, Garth A. Jones
Analytical forms of the optical helicity and optical chirality of monochromatic Laguerre-Gaussian optical vortex beams are derived up to second order in the paraxial parameter $kw_…
Optical vortex dichroism in chiral particles
Kayn A. Forbes, Garth A. Jones
Circular dichroism is the differential rate of absorption of right- and left-handed circularly polarized light by chiral particles. Optical vortices which convey orbital angular mo…
On the transfer of optical orbital angular momentum to matter
Kayn A. Forbes
The prevailing notion is that the orbital angular momentum (OAM) of an optical vortex can only be transferred to the internal degrees of freedom (i.e. electronic motion) of materia…
Relevance of Longitudinal Fields of Paraxial Optical Vortices
Kayn A. Forbes, Dale Green, Garth A. Jones
Longitudinal electromagnetic fields generally become comparable with the usually dominant transverse components in strongly-focussed, non-paraxial beams. For optical vortex modes i…
Spin-orbit interactions and chiroptical effects engaging orbital angular momentum of twisted light in chiral and achiral media
Kayn A. Forbes, David L. Andrews
There is recurrent interest in the orbital angular momentum (OAM) conveyed by optical vortices, which are structured beams with a helically twisted wavefront. Particular significan…