Abstract
Light beam with helical wavefront, also called optical vortex, carries quantized orbital angular momentum, and as such have many potential photonic applications. In this study, the interaction of a fluorene-based helical polymer thin film with vortex beams was studied. The helicity of the polymeric strands was greatly enhanced by thermal annealing. A liquid crystal phase plate was used to convert TEM00 laser beams into a helical wavefront beam with a phase singularity at its axis. A relatively high absorption dissymmetry was observed in a longer wavelength range, compared with the linear optical absorption of the annealed film sample. The left- and right-handed vortices had different transmittances. The absorption asymmetry of the annealed fluorene film in the case of vortex beams is mainly attributed to quadrupole interactions.
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