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Abstract
With the development of nano-optic technology, the optical nano-antenna has been widely used in the flelds of novel light sources, high-sensitive biological sensors, nanometer lithography, and nano-optical imaging. The relationship between the structural parameters of the antenna and the Purcell factor is very important for engineering applications. The electric near fleld proflle of the antenna was calculated and analyzed by using the flnite-difierence time-domain (FDTD) method, and the in∞uence of the structural parameters on the Purcell factor and the electric fleld was thoroughly investigated. A careful comparison of bowtie antenna radiation characteristics with difierent structural parameters was carried out. The results show that the thickness, the length and the curvature radius have great efiects on the Purcell factor and the optical antenna's electric near fleld. These flndings are promising for improving the performance of the optical bowtie nano-antenna.
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