Speaker
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
No
Main supervisor (name and email)<br>and his / her institution
A. Forbes, AForbes@csir.co.za, CSIR National Laser Centre, PO Box 395, Pretoria 0001, South Africa
Level for award<br> (Hons, MSc, <br> PhD)?
MSc
Abstract content <br> (Max 300 words)
High order Bessel beams are characterized by the azimuthal mode index, ℓ and radial component, kr, as a result they carry orbital angular momentum (OAM) and their far-field forms an annular ring of radius, R .These beams form in a region where parallel plane waves interfere in a conical manner. A method of separating the azimuthal, ℓ and radial, kr components of the Bessel Beams using cylindrical lenses [1] and an efficient orbital angular momentum (OAM) sorter [2] optical system is illustrated here. A conformal mapping technique [2] was used to achieve the sorting of Bessel beams, where the annular ring (Fourier transform of a Bessel beam) was mapped to a linear phase variation along the horizontal direction. A series of cylindrical lenses simultaneously Fourier transformed the transverse momentum states and imaged the unraveled annular ring to a detector plane, where the position of the detected spot is dependent on the amount of OAM it carries and its radial wave vector.
[1] A. Dudlely, T. Mhlanga, M. Lavery, A. Mcdonald, F. Roux, M. Padgett, A. Forbes, “Efficient sorting of Bessel beams,”Opt.Express 21(1), 165-171, (2013)
[2]Gregorius C. G. Berkhout, Martin P. J. Lavery, Marco W. Beijersbergen, Miles J. Padgett, “Efficient sorting of angular momentum of light,” *PhysRevLett.105 (16).153601 (2010)
