多缝隙蝶形偶极子纳米天线的设计及吸收特性 下载: 1121次
ing at the shortcomings of low absorptivity and narrow working band for a single structure nano-antenna, we propose a multi-slot butterfly dipole nano-antenna by the fusion of the multi-slot structure and the butterfly dipole. The multi-slot butterfly dipole is formed from an Au nano-butterfly dipole etched by multiple slots. This structure can simultaneously realize the near-field coupling of tips, the grating coupling, and the hybrid coupling among different media. The coaction of these three couplings can effectively improve the absorptivity in a wide band. The absorption performance of this nano-antenna in a wide band is analyzed by the finite-difference time-domain method. The numerical analyses show that several absorption peaks exist in the absorption characteristic curve of this multi-slot butterfly dipole nano-antenna in the 400-1800 nm band, and the maximum and the average absorptivities are 98.4% and 84.1%, respectively. The absorption performance of the proposed nano-antenna is obviously superior to that of the butterfly dipole nano-antenna. This antenna can keep a stable absorption performance in a wide band under different polarization states and different incident angles of light.
刘媛媛, 李康康, 田晓梦, 朱路. 多缝隙蝶形偶极子纳米天线的设计及吸收特性[J]. 光学学报, 2019, 39(2): 0223002. Yuanyuan Liu, Kangkang Li, Xiaomeng Tian, Lu Zhu. Design and Absorption Characteristics of Multi-Slot Butterfly Dipole Nano-Antenna[J]. Acta Optica Sinica, 2019, 39(2): 0223002.