The dark spots of Arago

Discontinued Devices LC-R 2500 Spatial Light Modulators
Digital-/ Computer Holography/ CGH Higher Order Modes / Optical Vortex / OAM Microscopy
Published on:
Authors: Pascal Fischer, Susan E. Skelton, Christopher G. Leburn, Casey T. Streuber, Ewan M. Wright, and Kishan Dholakia
Abstract:

“We explore the diffraction and propagation of Laguerre- Gaussian beams of varying azimuthal index past a circular obstacle both experimentally and numerically. When the beam and obstacle centers are aligned the famous spot of Arago, which arises for zero azimuthal index, is replaced for non-zero azimuthal indices by a dark spot of Arago, a simple consequence of the conserved phase singularity at the beam center. We explore how the dark spot of Arago behaves as the beam and obstacle centers are progressively misaligned, and find that the central dark spot may break into several dark spots of Arago for higher incident azimuthal index beams. “

Open Access

Publication: Optics Express
Issue/Year: Optics Express, Vol. 15, Issue 19, pp. 11860-11873
DOI: 10.1364/OE.15.011860
Link: https://doi.org/10.1364/OE.15.011860

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