Abstract
This paper theoretically shows that the handedness stemming from the unbounded optical orbital angular momentum of structured laser beams can engage in chiroptical interactions with chiral molecules, enhancing the usually small signals in both Rayleigh and Raman optical activity. Experimental methodologies and conditions that allow full utilization of the differential scattering effect are highlighted
Highlights
Optical activity is the intrinsic potential of chiral materials to exhibit discriminatory interactions with polarized light, according to their handedness [1,2]
Follow-up studies [27,28] first revealed how discriminatory absorption can take place in achiral media, a supplementary analysis highlighting unique forms of Rayleigh and Raman optical activity using twisted photons. Beyond these molecular quantum electrodynamical (QED) studies looking at optical activity, a substantial amount of work on discriminatory interactions using the handedness of a twisted light beam has been carried out very recently
From the two results (2.14) and (2.15), before any analysis of the angle dependence, we immediately discover that the circular-vortex differential scattering (CVDS) effect (2.11) can only be observed for scattered light with polarization components in the kkplane: regardless of the scattering angle, if the scattered light is analyzed for a component polarized in the transverse plane there is no CVDS effect
Summary
Optical activity is the intrinsic potential of chiral materials to exhibit discriminatory interactions with polarized light, according to their handedness [1,2]. Follow-up studies [27,28] first revealed how discriminatory absorption can take place in achiral media, a supplementary analysis highlighting unique forms of Rayleigh and Raman optical activity using twisted photons Beyond these molecular QED studies looking at optical activity, a substantial amount of work on discriminatory interactions using the handedness of a twisted light beam has been carried out very recently. These studies, distinctly different from the “natural” QED ones highlighted above, have been able to induce chiroptical effects with OAM by utilizing the helicity-dependent intensity distributions that arise through the spin-orbit coupling of focused or scattered nonparaxial light with circular polarization [29].
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