Zhuang Huawei, Liu Changyong, Li Fei, Zhuang Junjie, Kong Fanmin, Li Kang
Appl Opt. 2021 May 1;60(13):3634-3640. doi: 10.1364/AO.422343.
A plasmonic bandpass filter based on parallel bulk Dirac semimetals (BDSs) is proposed and numerically investigated using the finite-difference time-domain method. The proposed filter is realized by the evanescent coupling between the resonator and waveguide, and Fabry-Parot resonant theory is used to analyze its realization mechanism. The performance of the filter can be tuned by changing the coupling distance, length of the resonator, and Fermi levels of the BDSs. We further simulate a plasmonic broadband filter using coupling mode splitting by locating two identical resonators along the waveguide direction. The pass band of the proposed broadband filter can be tuned by adjusting the coupling distances between the resonators and waveguide.
提出了一种基于平行体狄拉克半金属（BDS）的表面等离子体带通滤波器，并采用时域有限差分法对其进行了数值研究。所提出的滤波器通过谐振器与波导之间的倏逝耦合来实现，并利用法布里 - 珀罗共振理论分析其实现机制。通过改变耦合距离、谐振器长度和BDS的费米能级，可以调节滤波器的性能。我们进一步通过沿波导方向定位两个相同的谐振器，利用耦合模分裂模拟了一种表面等离子体宽带滤波器。所提出的宽带滤波器的通带可以通过调整谐振器与波导之间的耦合距离来调节。
