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Surface plasmon resonance in interacting Si nanoparticle chains.

Juan Wang¹, Xiao-Jing Wang, Yang Jiao

¹Department of Physics, the Chinese University of Hong Kong, Shatin, New Territory, Hong Kong.

|July 22, 2010

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Adjacent silicon nanoparticles create split surface plasmon resonance (SPR) modes. This interaction enhances local fields between nanoparticles, controllable by nanostructure morphology for optical property manipulation.

Area of Science:

Nanophotonics
Materials Science
Solid State Physics

Background:

Adjacent nanoparticles exhibit coupled surface plasmon resonance (SPR) phenomena.
Understanding nanoparticle interactions is crucial for designing optical materials.
Silicon nanoparticles offer tunable plasmonic properties.

Purpose of the Study:

To investigate the interaction between adjacent silicon nanoparticles in a one-dimensional chain.
To analyze the splitting of surface plasmon resonance (SPR) into transverse and longitudinal polarizations.
To demonstrate the manipulation of optical properties by controlling silicon nanostructure morphology.

Main Methods:

Fabrication of silicon nanostructures with controlled morphologies.
Utilizing electron energy loss spectroscopy (EELS) and related techniques.

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Analyzing the spatial distribution and intensity of SPR.

Main Results:

SPR splitting into transverse and longitudinal polarizations observed due to inter-nanoparticle interaction.
Spatial redistribution of SPR intensity and local field enhancement between nanoparticles.
Longer impact parameter for longitudinal mode SPR compared to transverse mode SPR.

Conclusions:

Interactions in silicon nanoparticle chains significantly alter optical properties.
SPR characteristics can be tuned by controlling nanostructure morphology.
Electron energy loss spectroscopy is effective in visualizing these plasmonic interactions.