2009/04/14 by Alex G. F. de Beer, Sylvie Roke · 3 citations
Physics and Astronomy · Biochemistry, Genetics and Molecular Biology · #Spectroscopy and Quantum Chemical Studies #Random lasers and scattering media #Spectroscopy Techniques in Biomedical and Chemical Research
paper · doi:10.1103/physrevb.79.155420
openalex publication_date 2009/04/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/02
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.