Abstract
Nowadays, localized surface plasmon resonance (LSPR) and its related effects such as field enhancement (FE) of nanoparticles have gained attention of the researchers. Recent works show that the electric field could be enhanced in dimers of nanoparticles and hollow nanostructures more than mono particles due to the coupling of the electric field of the different surfaces. Along with this goal, we report the LSPR of gold hollow triangular dimers (GHTD) by FDTD solution. Our result show that two dominant peaks of the GHTD possess strong hotspot due to interaction between dipoles and quadrupoles of the plasmon modes. The FE parameters of the peaks increase with decrease of the dimer gap and they can reach to a value as large as to 120 and 338 for modes 1 and 2 when the dimer gap decreases to 1 nm, respectively. Moreover, the peaks red shift exponentially by decreasing the gap from 8 to 1 nm that shows the plasmon ruler behavior.
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