The dark spots of Arago

Pascal Fischer, Susan E. Skelton, Christopher G. Leburn, Casey T. Streuber, Ewan M. Wright, Kishan Dholakia

Research output: Contribution to journalArticle

8 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)11860-11873
Number of pages14
JournalOptics Express
Volume15
Issue number19
DOIs
StatePublished - Sep 17 2007

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'The dark spots of Arago'. Together they form a unique fingerprint.

  • Cite this

    Fischer, P., Skelton, S. E., Leburn, C. G., Streuber, C. T., Wright, E. M., & Dholakia, K. (2007). The dark spots of Arago. Optics Express, 15(19), 11860-11873. https://doi.org/10.1364/OE.15.011860