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Raman and fluorescent scattering by molecules embedded in dielectric spheroids.

D S Wang, M Kerker, H W Chew

|March 18, 2010

Summary

This study extends a model for light scattering from molecules in particles to spheroids. It shows how particle shape, size, and orientation affect fluorescent and Raman scattering, crucial for understanding molecular interactions within dielectric materials.

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Area of Science:

Physics
Physical Chemistry
Materials Science

Background:

Light scattering phenomena like fluorescence and Raman scattering are sensitive to particle properties.
Previous models focused on spherical and cylindrical particles, limiting analysis of complex morphologies.

Purpose of the Study:

To extend the theoretical model for light scattering to include spheroidal particles.
To investigate the influence of particle morphology, optical properties, and molecular distribution on scattering.

Main Methods:

Utilized the extended boundary condition method (EBCM) to compute transmitted fields.
Applied the equivalence principle to calculate fields at shifted frequencies.

Main Results:

The model now accounts for spheroids, enabling analysis of non-spherical particle effects.
Demonstrated the impact of particle refractive index, size, shape, and orientation on scattering.
Illustrated effects for models with two polarizabilities of embedded active dipoles.

Conclusions:

The extended model provides a more comprehensive understanding of light scattering in dielectric particles.
Particle characteristics significantly dictate the intensity and nature of molecular scattering signals.