Application of COMSOL Multiphysics for Nanosphere Dimer

Zhi-zhen DUAN, Yang XI, Yang LU, Yue-e LI, Zhong WANG, A-ning MA


A simple nanosphere dimer system was constructed based on the wave optics module in COMSOL Multiphysics to verify their hot spots effect. By mapping their electric field distributions, we found that as the nanogap decreases or the nanosphere radius increases in a way, the field enhancement of the dimer goes up. In addition, the resonant peak along with the excitation wavelength can also be tuned by varying the size and nanogap of the nanospheres. We have demonstrated that the strong interaction between two nanospheres may be induced by the dipole coupling, consistent with our currently accepted theory. The results showed it could be a useful tool for future design and simulation of electromagnetic fields and electromagnetic waves correlated with nanoparticles.


COMSOL Multiphysics, Surface Enhanced Raman Scattering, localized surface plasmon resonance, hot spots


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