Engineering optical response through gold bowtie nanoantennas array |
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| Authors: | Hongjian Li Shaoli FuSuxia Xie Xin ZhouHaiqing Xu Zhimin Liu |
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| Affiliation: | a College of Physics Science and Technology, Central South University, Changsha 410083, China
b College of Materials Science and Engineering, Central South University, Changsha 410083, China |
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| Abstract: | We propose the coupled gold bowtie nanoantennas array and investigate its plasmonic properties theoretically. The bowtie antenna consists of a pair of opposing truncated cones. We calculate the transmission spectra and the electric field distributions. The evolution of the transmission spectrum with the gap width of the bowtie, the diameter of the tip of the cone and the distance between adjacent bowties is directly visualized. Furthermore, the sensitivity of the antennas array to dielectric constant changes of the environment is also investigated in detail. We show the electric field distribution of this nanostructure and find that Ex is mainly located at the corners of the cross section, especially at the extremity of the cone. As for the Ey, the electric field enhancement localizes at the external edges and the gap of the bowtie. Our work elucidates further the plasmonic interactions can be useful in the design of optimized, sensitive optical sensors, and the enhancement of the fluorescence of molecules. |
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| Keywords: | Bowtie antenna array Surface plasmons Transmission spectrum Electric field distributions |
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