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Dual-band absorbers based on multiplexed gratings at mid-infrared frequencies
Journal of Nanophotonics ( IF 1.5 ) Pub Date : 2021-06-01 , DOI: 10.1117/1.jnp.15.026012
Liaoliang Xiao 1
Affiliation  

We design a dual-band absorber based on metal multiplexed gratings at mid-infrared (mid-IR) frequencies. The metal multiplexed gratings are realized with two constitutive gratings and separated from a metallic ground plate by a thick dielectric spacer in order to construct the metal–insulator–metal architecture. Simulations indicate that two different absorption frequencies from the excitation of surface plasmon–polariton modes can be achieved under normal incidence, due to the different field distributions of each resonance node numbers in supercell. The doublet resonance positions can be independently and arbitrarily adjusted by varying the constitutive grating periods. We also confirmed that the absorption performance of the resonance peak is related to the non-uniform distribution level of the corresponding constitutive grating ridge. The designed absorber can be easily fabricated with planar processing technology and used in many applications where multispectral control of mid-IR signals is required.

中文翻译:

基于中红外多路光栅的双波段吸收器

我们设计了一种基于中红外 (mid-IR) 频率金属多路复用光栅的双波段吸收器。金属多路复用光栅由两个本构光栅实现,并通过厚的介电隔离物与金属接地板隔开,以构建金属-绝缘体-金属结构。模拟表明,由于超级单元中每个共振节点数的不同场分布,可以在法向入射下实现来自表面等离子体激元模式激发的两种不同吸收频率。双峰共振位置可以通过改变本构光栅周期来独立和任意调整。我们还证实共振峰的吸收性能与相应的本构光栅脊的非均匀分布水平有关。
更新日期:2021-06-30
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