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Second harmonic generation in three-dimensional structures based on homogeneous centrosymmetric metallic spheres
1School of Physics, Beijing Institute of Technology, Beijing, China.
Optics Express
|January 26, 2012
Summary
We developed a theory for second harmonic generation (SHG) in metallic nanoparticle structures. Localized surface plasmon resonances significantly influence the nonlinear optical response of these ensembles.
Area of Science:
- Physics
- Materials Science
- Optics
Background:
- Second harmonic generation (SHG) is a key nonlinear optical process.
- Understanding SHG in complex nanostructures is crucial for optical device development.
Purpose of the Study:
- To develop a theoretical framework for SHG in 3D arrangements of metallic spheres.
- To analyze the influence of localized surface plasmon-polariton resonances on SHG.
Main Methods:
- Multiple scattering theory of electromagnetic multipole fields.
- Calculation of electromagnetic fields and scattering cross-sections for various configurations.
Main Results:
- Developed a theory for SHG in arbitrary distributions of metallic spheres.
- Demonstrated strong influence of localized surface plasmon-polariton resonances on linear and nonlinear optical response.
- Analyzed the physical origin of this plasmonic influence.
Conclusions:
- The developed theory accurately describes SHG in metallic nanoparticle ensembles.
- Localized surface plasmon-polariton resonances are critical for tailoring nonlinear optical properties.
- This work provides insights into designing novel plasmonic nanostructures for nonlinear optics.
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