We perform numerical modelling of nonlinear optical (NLO) microscopy of complex anisotropic three-dimensional (3D) media using the uncoupled dipole approximation. The modelling is applied to 3D biological microstructures resembling collagen fibers and multilamellar vesicles. The results elucidate how nonlinear optical activity effects, such as second-harmonic generation circular dichroism, can arise from 3D morphological chirality, in addition to molecular level chirality. We also show how third-harmonic generation circular dichroism could act as a contrast mechanism for visualizing local structural ordering in 3D anisotropic materials.
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Huttunen et al. (2014) studied this question.
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