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… 

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References

SHOWING 1-10 OF 37 REFERENCES

Spin and orbital angular momenta of light reflected from a cone

We examine several retro-reflecting optical elements, each involving two reflections. In the case of a hollow metallic cone having an apex angle of 90 deg., a circularly polarized incident beam

Generating optical orbital angular momentum at visible wavelengths using a plasmonic metasurface

Visible, circularly polarised light can be transformed into light-carrying orbital angular momentum by a plasmonic metasurface. That is the finding of Ebrahim Karimi and co-workers at the University

Spin-to-orbital conversion of the angular momentum of light and its classical and quantum applications

A few years ago the possibility of coupling and inter-converting the spin and orbital angular momentum (SAM and OAM) of paraxial light beams in inhomogeneous anisotropic media was demonstrated. An

Generation of achromatic, uniform-phase, radially polarized beams.

It is shown theoretically that thephase component of radially polarized beam is canceled out by the phase component of the incident optical vortex, resulting in a radially polarization beam with uniform phase.

Advances in optical angular momentum

Some 16 years ago, Allen et al. [Phys. Rev. A 45, 8185 (1992)] recognised that laser beams which carried an angular momentum additional to photon spin, could be realized in the laboratory. Such beams

Rapid generation of light beams carrying orbital angular momentum.

We report a technique for encoding both amplitude and phase variations onto a laser beam using a single digital micro-mirror device (DMD). Using this technique, we generate Laguerre-Gaussian and

Polarization control of single photon quantum orbital angular momentum states.

This work introduces and test experimentally a series of simple optical schemes for the coherent transfer of quantum information from the polarization to the orbital angular momentum of single photons and vice versa using a newly developed optical device, the so-called "q-plate".

Generation and dynamics of optical beams with polarization singularities.

This work presents a convenient method to generate vector beams of light having polarization singularities on their axis, via partial spin-to-orbital angular momentum conversion in a suitably patterned liquid crystal cell, and investigates the free-air propagation of these fields across a Rayleigh range.

Limitations to the determination of a Laguerre–Gauss spectrum via projective, phase-flattening measurement

One of the most widely used techniques for measuring the orbital angular momentum (OAM) components of a light beam is to flatten the spiral phase front of a mode, in order to couple it to a

Free-space quantum key distribution by rotation-invariant twisted photons.

This work reports the experimental demonstration of a link for free-space quantum communication with OAM operating over a distance of 210 m, and implements quantum key distribution, a protocol exploiting the features of quantum mechanics to guarantee unconditional security in cryptographic communication.