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Related Experiment Video

Updated: Jul 19, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

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Published on: March 2, 2016

Plasmon hybridization in nanoshells with a nonconcentric core.

Yanpeng Wu¹, Peter Nordlander

¹Department of Physics and Astronomy, Rice University, MS 61, Houston, TX 77251-1892, USA.

The Journal of Chemical Physics

|October 4, 2006

Summary

Offsetting the core in a nanoshell enhances electromagnetic fields and shifts plasmon energies. Higher multipolar plasmons become visible, with effects depending strongly on the offset distance.

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Area of Science:

Plasmonics
Nanophotonics
Computational Electromagnetics

Background:

Nanoshells exhibit unique optical properties due to surface plasmon resonances.
Concentric core-shell structures are well-studied, but the effect of core displacement is less understood.

Purpose of the Study:

Investigate the impact of core offset distance on plasmon mode energies and excitation cross-sections in nanoshells.
Analyze how core displacement influences electromagnetic field enhancement and spectral features.

Main Methods:

Applied the plasmon hybridization method for theoretical analysis.
Utilized a two-center spherical coordinate system for mathematical convenience.
Validated results using finite difference time domain (FDTD) simulations.

Main Results:

Core offset shifts plasmon energies, with dependence strengthening at larger offsets.
Higher multipolar plasmon modes become dipole active and optically observable.
Electromagnetic field enhancements are significantly larger compared to concentric nanoshells.
Optical absorption spectra show relatively weak polarization dependence.

Conclusions:

Core offset in nanoshells offers a tunable mechanism to modify plasmonic properties.
This geometry enhances localized electromagnetic fields, beneficial for applications.
The findings provide insights into designing plasmonic nanostructures with tailored optical responses.