DSpace
 

Researchspace >
General science, engineering & technology >
General science, engineering & technology >
General science, engineering & technology >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/6220

Title: Putting light in a spin
Authors: Dudley, A
Rop, R
Litvin, IA
Lopez-Mariscal, C
Roux, FS
Forbes, A
Keywords: Bessel beams
Angular rotation
Azimuthal decomposition
Orbital angular momentum density
Issue Date: Aug-2012
Publisher: SPIE
Citation: Dudley, A, Rop, R, Litvin, IA, Lopez-Mariscal, C, Roux, FS and Forbes, A. Putting light in a spin. Proc. SPIE 8490, Laser Beam Shaping XIII, 849006 (October 15, 2012); doi:10.1117/12.932224
Series/Report no.: Workflow;9715
Abstract: We experimentally generated superpositions of higher-order Bessel beams that possess no global orbital angular momentum (OAM), yet exhibit an angular rotation in their intensity profile as the field propagates. The digital holograms encoded on a spatial light modulator (SLM), used for generating such fields, consist of two annular rings of unequal radial wave-vectors where each ring is encoded with an azimuthal mode of equal order but opposite charge. We present experimentally measured angular rotation rates for some example superposition fields, which are shown to be in good agreement with that predicted theoretically. Introducing a second SLM and a Fourier transforming lens, we demonstrate a simple approach to perform an azimuthal decomposition of our generated optical fields. Bounding the match-filter to an annular ring, of varying radius, we are able to perform a scale-independent azimuthal decomposition of our initial field. From the measured weightings of the azimuthally decomposed modes we show reconstruction of the cross-sectional intensity profile and OAM density of our initial field.
Description: Copyright: 2012 SPIE. Dudley, A, Rop, R, Litvin, IA, Lopez-Mariscal, C, Roux, FS and Forbes, A. Putting light in a spin. Proc. SPIE 8490, Laser Beam Shaping XIII, 849006 (October 15, 2012); doi:10.1117/12.932224. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
URI: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1380172
http://hdl.handle.net/10204/6220
ISBN: 9780819492074
Appears in Collections:Laser physics and technology
General science, engineering & technology

Files in This Item:

File Description SizeFormat
Dudley4_2012.pdf587.4 kBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback