# Achromatic orbital angular momentum generator

@article{Bouchard2014AchromaticOA, title={Achromatic orbital angular momentum generator}, author={Fr{\'e}d{\'e}ric Bouchard and Harjaspreet Mand and Mohammad Mirhosseini and Ebrahim Karimi and Robert W. Boyd}, journal={New Journal of Physics}, year={2014}, volume={16} }

We describe a novel approach for generating light beams that carry orbital angular momentum (OAM) by means of total internal reflection in an isotropic medium. A continuous space-varying cylindrically symmetric reflector, in the form of two glued hollow axicons, is used to introduce a nonuniform rotation of polarization into a linearly polarized input beam. This device acts as a full spin-to-orbital angular momentum convertor. It functions by switching the helicity of the incoming beamʼs…

## 30 Citations

### Spin-to-orbital angular momentum conversion in dielectric metasurfaces.

- PhysicsOptics express
- 2017

This paper demonstrates high-efficiency Spin-to-Orbital angular momentum-Converters (SOCs) at visible wavelengths based on dielectric metasurfaces and shows for the first time the simultaneous generation of collinear helical beams with different and arbitrary orbital angular momentum.

### Achromatic vector vortex beams from a glass cone

- PhysicsNature communications
- 2016

Here it is discovered that not only does the beam contain orbital angular momentum but can trivially be converted to a radially polarized beam, and the Fresnel coefficients are reasonably stable across the visible spectrum, which is demonstrated by measuring white light polarization profiles.

### Arbitrary optical wavefront shaping via spin-to-orbit coupling

- Physics
- 2016

Converting spin angular momentum to orbital angular momentum has been shown to be a practical and efficient method for generating optical beams carrying orbital angular momentum and possessing a…

### Singular beam shaping from spin-orbit flat optics

- Physics
- 2017

It is well-known that paraxial coherent electromagnetic fields can be completelycharacterized in terms of their radial and azimuthal spatial degrees of freedom in the transverse planethat add to the…

### Catenary optics for achromatic generation of perfect optical angular momentum

- PhysicsScience Advances
- 2015

It is shown that the optical catenary can serve as a unique building block of metasurfaces to produce continuous and linear phase shift covering [0, 2π], a mission that is extremely difficult if not impossible for state-of-the-art technology.

### Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach

- PhysicsScientific Reports
- 2017

The scheme for generating robust achromatic vortex pulses in the femtosecond regime, with no conceivable spectral-temporal range and peak-power limitations, can have significant advantages for a variety of applications.

### Electrons in intense laser fields with local phase, polarization, and skyrmionic textures

- Physics
- 2020

Laser fields can be shaped on a subwavelength scale as to have a specific distribution in spin angular momentum, orbital structure, or topology. We study how these various features affect the…

### Topological features of vector vortex beams perturbed with uniformly polarized light

- PhysicsScientific reports
- 2017

Inspired by conceptually similar phenomena occurring in the polarization pattern characterizing the skylight, it is shown how perturbations that break the symmetry of radially symmetric vector beams lead to the formation of a pair of fundamental and stable singularities, i.e. points of circular polarization.

### Pure and achromatic spin-orbit shaping of light from Fresnel reflection off space-variant anisotropic media

- PhysicsPhysical Review A
- 2019

We propose an approach to achieve achromatic pure geometric phase shaping of light from anisotropic media by exploiting the fundamental laws of electromagnetic waves. Its practical implementation…

### Spin-to-Orbital Angular Momentum Mapping of Polychromatic Light.

- PhysicsPhysical review letters
- 2018

A simple and robust add-on to reflective geometric phase flat optics whose advantages are emphasized in the context of spin-to-orbital angular momentum mapping is presented.

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