Abstract

In conductively connected nanoparticles, the bonding dimer plasmons (BDP) mode and the charge transfer plasmon (CTP) mode are allowed at different wavelengths. We present a connected nanocuboidal shaped system with huge coupling surface areas. The red shift of extinction spectra occurs for increasing gap and decreasing conductive junction cross sectional area. With the change of the electric field distribution brought by the connection, we also get a CTP red shift over 250 nm by moving the connection outward less than 50 nanometers horizontally. Besides, the full width at half maximum of the red-shifting CTP peak also decreases by over 50 nm. The CTP peak also red shifts when the connection moves outside vertically.

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