Dichroism is often associated with chiral systems and circularly polarized light that is used as a chiral reagent. The two mirror images of a chiral systems are discerned by studying the propagation of left- and right-circularly polarized light. Here we demonstrate (a) efficient chiral sensitivity with linearly polarized helical light beams carrying an orbital angular momentum, and (b) that dichroism is intrinsic to achiral systems including amorphous materials. We model helical dichroism by considering induced multi-pole moments in light-matter interactions. Our research challenges the conventional wisdom that dichroism does not exist in achiral systems, enables to control light-matter interaction and opens new opportunities in chiroptical spectroscopy.
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