Abstract
We present both numerical and experimental results to study the
diffraction of twisted light beams based on orbital angular momentum (OAM)
eigenmode decomposition, where the total initial field, including light
and aperture, is represented by a two-dimensional spectrum of
Laguerre–Gaussian modes. We use a phase-only spatial light modulator to
display a holographic grating for both generating the twisted light and
mimicking the finite aperture. We take a triangular aperture as an example
to describe the diffraction behavior of a twisted light beam carrying an
OAM number of ℓ=3 from the near-field to far-field regions, where the
interesting gradual formation of triangular bright lattices are observed.
An excellent agreement between the numerical simulations and experimental
observations is clearly seen. It is noted that this method is particularly
useful for the study of the diffraction of twisted light fields incident
on any apertures of rotational symmetry.
© 2016 Chinese Laser Press
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