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Synthetic chiral light fields were recently introduced as a novel source ofchirality [Ayuso et al. Nat. Phot. 13, 866 (2019)]. This locally-chiral lightspans a three-dimensional polarization that plots a chiral trajectory inspace-time, leading to huge nonlinear chiral signals upon interactions withchiral media. The degree of chirality of this new form of light was defined,characterized, and shown to be proportional to the chiral signal conversionefficiency. However, the sign of the light's chirality - its 'handedness' - hasnot yet been defined. Standard definitions of helicity are inapplicable forlocally-chiral light due to its complex three-dimensional structure. Here, wedefine an unambiguous handedness for locally-chiral fields and employ it inpractical calculations.

Unambiguous definition of handedness for locally-chiral light