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Phys Rev Lett. 2010 Jul 30;105(5):053904. Epub 2010 Jul 29.

Unveiling a truncated optical lattice associated with a triangular aperture using light's orbital angular momentum.

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  • 1Optics and Materials Group-Optma, Universidade Federal de Alagoas, Caixa Postal 2051, 57061-970, Maceió, AL, Brazil.


We show that the orbital angular momentum can be used to unveil lattice properties hidden in diffraction patterns of a simple triangular aperture. Depending on the orbital angular momentum of the incident beam, the far field diffraction pattern reveals a truncated optical lattice associated with the illuminated aperture. This effect can be used to measure the topological charge of light beams.

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