Q-factor and absorption enhancement for plasmonic anisotropic nanoparticles

Area of Science:

• Plasmonics and Nanophotonics
• Materials Science

Background:

• Metal-dielectric core-shell nanoparticles exhibit unique optical properties.
• Anisotropy in nanoparticle layers can significantly influence light-matter interactions.

Purpose of the Study:

• To investigate the scattering and absorption characteristics of anisotropic metal-dielectric core-shell nanoparticles.
• To explore methods for enhancing the optical performance of plasmonic nanoparticles.

Main Methods:

• Theoretical investigation of scattering and absorption properties.
• Analysis of localized resonant surface modes and their decay rates.
• Modeling of anisotropic cladding using isotropic layered structures.

Main Results:

• Radially anisotropic dielectric layers accelerate evanescent decay of localized resonant surface modes.
• Achieved enhancement in Q-factor and absorption rate.
• Maximized absorption cross-section to the single resonance absorption limit.
• Demonstrated realization of artificial anisotropic cladding via isotropic layered structures.

Conclusions:

• Anisotropic dielectric layers offer a route to significantly boost nanoparticle light absorption and scattering.
• The proposed design using isotropic layered structures provides a practical method for creating these advanced plasmonic materials.
• This work may drive novel applications in areas relying on controlled light scattering and absorption by plasmonic nanoparticles.