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The study of plasmonic elliptical dimer nanoantennas with different geometry

In this paper, the electrical property of a geometric optimization with elliptical shape dimer nanoantennas has been studied. Numerical calculations are based on the method of finite-difference time-domain (FDTD). Three types of elliptical shape dimer nanoantennas with different geometrical parameters were considered, namely, horizontal dimer, parallel dimer, and parallel-horizontal dimer. We have found that plasmonic nanoantennas with the horizontal dimer embedded into a 1D double-arm grating system provide strong electric field enhancement as compared with the others.