Acta Optica Sinica, Volume. 39, Issue 2, 0223002(2019)
Design and Absorption Characteristics of Multi-Slot Butterfly Dipole Nano-Antenna
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.
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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
Category: Optical Devices
Received: Aug. 8, 2018
Accepted: Oct. 8, 2018
Published Online: May. 10, 2019
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