7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Digital detection of Bessel-Gauss beams

10 Jul 2014, 14:00
20m
D Les 102

D Les 102

Oral Presentation Track C - Photonics Photonics

Speaker

Ms Thandeka Mhlanga (University of KwaZulu-Natal)

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

MSc

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

High-order Bessel-Gauss beams (BG) are beams of helical wave front, described by their ℓ-azimuthally varying phase and their radial wave vector kr. Bessel beams have been extensively studied due to their interesting properties, as they are known to be non-diffractive over a finite region, and their ability to self-reconstruct after encountering an obstruction. These beams carry orbital angular momentum of light of ℓ ħ per photon; as a result these modes can be used as a basis for encoding information. The tools to extract the azimuthal information carried by these beams have been introduced, but not much work has been done in the two-dimensional detection of these modes. We illustrate a new method for the two-dimensional detection of the BG modes of arbitrary radial and azimuthal mode indices using digital axicons. We also apply this tool to observe the radial and azimuthal spectrums of the self-reconstructing Bessel beam after encountering an obstruction, and also through optical turbulence.

Keywords: orbital angular momentum, two-dimensional detection, digital axicon

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

No

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

Yes

Main supervisor (name and email)<br>and his / her institution

Andrew Forbes

Primary author

Ms Thandeka Mhlanga (University of KwaZulu-Natal)

Co-authors

Mr Abderrahmen Trichili (University of Carthage) Prof. Andrew Forbes (CSIR) Dr Filippus S. Roux (CSIR) Ms Yaseera Ismail (University of KwaZulu-Natal)

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