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13 March 2024 Probing dichroism in matter with helical light beams
Ravi Bhardwaj, Ashish Jain, Jean-Luc Begin, Paul Corkum, Ebrahim Karimi, Thomas Brabec
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Proceedings Volume PC12901, Complex Light and Optical Forces XVIII; PC129010M (2024) https://doi.org/10.1117/12.3010442
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
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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Ravi Bhardwaj, Ashish Jain, Jean-Luc Begin, Paul Corkum, Ebrahim Karimi, and Thomas Brabec "Probing dichroism in matter with helical light beams", Proc. SPIE PC12901, Complex Light and Optical Forces XVIII, PC129010M (13 March 2024); https://doi.org/10.1117/12.3010442
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KEYWORDS
Dichroic materials
Polarized light
Angular momentum
Light absorption
Solids
Liquids
Spiral phase plates
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