A static phase-only SLM divided into annular regions uses the radial-to-axial mapping of a Bessel beam's conical spectrum to encode and sequence multiple transverse modes along a single propagating beam.
Wanget al., Terabit free-space data transmission employing orbital angular momentum multiplexing, Nat
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Passive Cross-Basis Mode Transitions Along a Single Freely Propagating Bessel Beam
A static phase-only SLM divided into annular regions uses the radial-to-axial mapping of a Bessel beam's conical spectrum to encode and sequence multiple transverse modes along a single propagating beam.