Journal
PHYSICAL REVIEW B
Volume 79, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.155420
Keywords
colloids; drops; light scattering; Mie scattering; optical harmonic generation; water
Funding
- Deutsche Forschungsgemeinschaft
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We present a theory for second-order nonlinear light scattering from spherical particles using source waves of arbitrary frequency and direction based on a combination of linear Mie scattering and reciprocity theory. The theory presented in this work extends existing theory applied to second-harmonic scattering by allowing noncollinear excitation waves of unequal frequency. The absence of an intrinsic symmetry axis was overcome by using a nonstandard expansion for the linear interaction. Numerical results obtained for water droplets in air show an increase in the number of observed maxima in the sum-frequency scattering pattern compared to index-matched theories, as well as a strong backscatter peak, which eventually dominates the scattering pattern. Our method opens up possibilities for studying increasingly complex colloidal systems with nonlinear light scattering spectroscopy.
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