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.
CITATION STYLE
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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