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Controlling light scattering and polarization by spherical particles with radial anisotropy
Y X Ni1, L Gao, A E Miroshnichenko
1Jiangsu Key Laboratory of Thin Films, Department of Physics, Soochow University, Suzhou 215006, China.
Optics Express
|April 11, 2013
Summary
We identified conditions for zero-forward and zero-backward scattering in anisotropic spheres. Near-field intensity is tunable, and a generalized Brewster's angle enables total polarization of scattered light.
Area of Science:
- Electromagnetism
- Optics
- Materials Science
Background:
- Understanding light scattering from anisotropic materials is crucial for optical device design.
- Quasi-static approximations simplify electromagnetic scattering problems for small particles.
Purpose of the Study:
- Derive zero-forward and zero-backward scattering conditions for radially anisotropic spheres.
- Investigate the influence of radial anisotropy on near-field and far-field scattering.
- Explore the concept of a generalized Brewster's angle for anisotropic spheres.
Main Methods:
- Full-wave electromagnetic theory.
- Quasi-static limit analysis.
- Derivation of scattering conditions and Brewster's angle.
Main Results:
- Identified zero-forward and zero-backward scattering conditions.
- Demonstrated tunable near-field intensity via radial anisotropy.
- Observed similar far-field scattering diagrams for both zero-forward and zero-backward conditions.
- Derived a generalized Brewster's angle for total polarization of scattered light.
Conclusions:
- Radially anisotropic spheres offer control over light scattering phenomena.
- Tunable polarization conversion and high-quality polarized scattering waves are achievable.
- The findings have implications for optical metamaterials and nanophotonics.
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