Second harmonic generation theory for a helical macromolecule with high sensitivity to structural disorder

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Abstract

Microscopic theory for the second harmonic generation in a helical molecular system is developed in the minimal coupling representation including non-local interaction effects. At the second order to the field we find a compact expression which combines dipolar, quadrupolar and magnetic contributions. A detailed derivation of the response is performed to specifically isolate the quadratic coupling terms, which we denote as theKcoupling. Applying the theory to a helical macromolecule we find that the dipolar and quadrupolar contributions reflect the symmetry properties of the system and its homogeneity, while theKcoupling contribution reveals inhomogeneities of the system.

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Abramavicius, D., Krouglov, S., & Barzda, V. (2021). Second harmonic generation theory for a helical macromolecule with high sensitivity to structural disorder. Physical Chemistry Chemical Physics, 23(36), 20201–20217. https://doi.org/10.1039/d1cp00694k

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