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We investigate the optical properties of the azimuthally-radially polarizedbeam (ARPB), a superposition of an azimuthally polarized beam and a radiallypolarized beam, which can be tuned to exhibit maximum chirality at a givenenergy density. This condition is called "optimal chiral light" (OCL) since itrepresents the maximum local chirality at a given energy density. Thetransverse fields of an ARPB dominate in the transverse plane but vanish on thebeam axis, where the magnetic and electric fields are purely longitudinal. Thisspatial separation between transverse and longitudinal components leads tovanishing linear and angular momentum densities on the axis, where only theenergy and helicity densities associated with the longitudinal fields persist.The ARPB does not have a phase variation around the beam axis and nonethelessexhibits a power flow around the beam axis that causes a longitudinal orbitalmomentum density. We introduce a concise notation for the ARPB and providefield quantities, especially for the optimally chiral configuration. The ARPBshows promise for precise one-dimensional chirality probing andenantioseparation of chiral particles along the beam axis. We propose a setupto generate ARPBs with controlled chirality and orbital angular momentum.

The Azimuthally-Radially Polarized Beam: Helicity and Momentum Densities, Generation and Optimal Chiral Light