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There is recurrent interest in the orbital angular momentum (OAM) conveyed byoptical vortices, which are structured beams with a helically twistedwavefront. Particular significance is attached to the issue of how, in itsinteractions with matter, light conveying OAM might prove sensitive to therelative handedness and degree of twist in the associated optical wavefront. Asa result of recent experimental and theoretical studies, the supposition thatbeams with OAM might enable discrimination between oppositely handed forms ofmatter has become a renewed focus of attention. Some of the tantalizingconclusions that are beginning to emerge from this research have, however, notyet established a definitive basis for a supporting mechanism. To resolve thisproblem requires the development of theory to support a faithfulrepresentation, and a thorough understanding, of the fundamentalmolecule-photon physics at play in such optical processes, even for processesas basic as absorption. The present analysis establishes mechanisms at playthat entail a novel manifestation of optical spin-orbit interactions (SOI),engaging transition electric quadrupole moments. Moreover, powerful symmetryprinciples prove to render distinctively different criteria governing theexhibition of 2D and 3D chirality. The new results elucidate the operation ofsuch effects, identifying their responsibility for discriminatory opticalinteractions of various forms in both chiral and achiral media.

Spin-orbit interactions and chiroptical effects engaging orbital angular momentum of twisted light in chiral and achiral media