Higher-order Poincaré modes carrying tunable Pancharatnam topological charge enable free-space paraxial control of spin-orbit interaction via differential Gouy phases and beam divergence.
Note how the topological charge determines the change in the Gouy phase term, as well as the divergence through the radial term
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Topological Control of Chirality and Spin with Structured Light
Higher-order Poincaré modes carrying tunable Pancharatnam topological charge enable free-space paraxial control of spin-orbit interaction via differential Gouy phases and beam divergence.