Fig. 1: Schematic illustration of chiroptical sensing using circularly polarized light versus vortex light.
From: Multidimensional helical dichroism from a chiral molecular nanoassembly
a The chiral nanoassemblies synthesized by chiral molecules are typically randomly distributed on the substrate, resulting in a weak chiroptical signal by circularly polarized light. The chiroptical signal by circularly polarized light shows a collective property of chiral nanoassemblies. b A strong chiroptical signal can be achieved even on single nanoassemblies by vortex beams, yielding a large asymmetry factor from local interaction with optical OAM. c Asymmetry factors versus operating wavelengths of chiroptical sensing in chiral molecules or nanoassemblies in this work and previous reports for chiral molecular sensing10,15,16,18,21,24,27,28,29,30,33,47,48. d Schematic of the chiral nanoassemblies. Local angular momentum flux density on nanoassemblies illuminated by circularly polarized light (e) and vortex beam (f) with the same total angular momentum, respectively. Colors represent the normalized values of the local angular momentum flux density (e and f are normalized by the same factor). The three simulated planes are indicated in (d). The shaded area represents the cross-section of the nanoassembly in that plane.
