Understanding the impact of particle separation in a plasmonic dimer on the resonance wavelength

Plasmonic dimers consist of two nanoparticles in near vicinity of each other, which give the dimer unique properties that the single constituents do not have. Given the increased interest in these types of particles, establishing efficient modeling techniques for dimers becomes essential to be able to design systems with optimal performance. Moreover, modeling dimers is a key first step into modeling more complex systems of interacting nanoparticles where traditional simulation methods are highly inefficient. In this paper, we present an efficient modeling technique for dimers based on the quasistatic approximation. Our modeling technique can capture the resonance properties of dimers and our formulation of the quasistatic approximation problem is efficient to implement.