摘要: Engineering of the orbital angular momentum (OAM) of light due to interaction
with photonic lattices reveals rich physics and motivates potential
applications. We report the experimental creation of regularly-distributed
quantized vortex arrays in momentum space by probing the honeycomb and
hexagonal photonic lattices with a single focused Gaussian beam. For the
honeycomb lattice, the vortices are associated with Dirac points and mimic the
Berry curvature sources. However, we show that the resulting spatial patterns
of vortices are strongly defined by the symmetry of the wave packet evolving in
the optical lattice but not by lattice topological properties. Our findings
reveal the underlying physics by connecting the symmetry and OAM conversion,
and provide a simple and efficient method to create regularly-distributed
multiple vortices by unstructured light.
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