Dual-wavelength narrow-bandwidth dielectric metamaterial absorber
doi: 10.37188/CO.2021-0075
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摘要: 为降低窄带宽超材料吸收器（Metamaterial Absorber，MA）制造成本的同时拓宽其应用领域，本文基于时域有限差分法利用介质材料设计出双波长窄带宽介质MA，其由Au衬底、SiO2介质层和Si介质非对称光栅构成。经模拟计算发现，本文提出的双波长窄带宽介质MA在λ1=1.20852 μm和λ2=1.23821 μm具有超高吸收效率，而且FWHM也分别只有0.735 nm和0.077 nm。MA在λ1实现窄带宽吸收主要是因为光在SiO2层形成了法布里-珀罗(Fabry-Pérot, FP)腔共振，而MA在λ2实现窄带宽吸收主要是由于入射光在介质非对称光栅中形成了导模共振效应。经理论计算可知，通过改变MA的结构参数可对其吸收特性产生较为显著的影响。Abstract: In order to reduce the manufacturing cost of the narrow-bandwidth Metamaterial Absorber (MA) and broaden its application field, a dual-wavelength dielectric narrow-bandwidth MA, composed of Au substrate, SiO2 dielectric layer and Si dielectric asymmetric grating, is designed based on the finite-difference time-domain method using dielectric materials. It is found by simulation that the proposed narrow-bandwidth MA has ultra-high absorption efficiency at λ1 = 1.20852 μm and λ2 = 1.23821 μm, and the FWHM is only 0.735 nm and 0.077 nm, respectively. The main principle that MA achieves the narrow-bandwidth absorption at λ1 is mainly due to the formation of Fabry-Pérot (FP) cavity resonance in the SiO2 layer, while the narrow-bandwidth absorption of MA at λ2 is mainly due to the guided mode resonance effect of the incident light in the asymmetric grating. The theoretical calculations show that the absorption characteristics can be affected more significantly by changing the structural parameters of the MA.
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图 1 双波长窄带宽介质MA结构图
Figure 1. Dual-wavelength narrow-bandwidth dielectric MA structure diagram
图 2 双波长窄带宽介质MA吸收光谱
Figure 2. Absorption spectroscopy of dual-wavelength narrow-bandwidth dielectric MA
图 3 介质MA的有效阻抗。（a）阻抗实部；（b）阻抗虚部
Figure 3. Effective impedance of dielectric MA. (a) Real part of impedance; (b) imaginary part of impedance
图 4 双波长窄带宽介质MA在不同波长处的电场分布。（a）λ1；（b）λ2
Figure 4. Electric field distribution of dual-wavelength narrow-bandwidth dielectric MA at different wavelengths. (a) λ1; (b) λ2
图 5 t对双波长窄带宽介质MA吸收特性的影响。（a）吸收光谱；（b）吸收波长
Figure 5. Effect of t on the absorption characteristics of the dual-wavelength narrow-bandwidth dielectric MA. (a) Absorption spectra; (b) absorption wavelength
图 6 t=1.205 μm时MA在波长λ2处的电场分布
Figure 6. Electric field distribution of MA at wavelength λ2 when t = 1.205 μm
图 7 W1对双波长窄带宽介质MA吸收特性的影响。（a）吸收光谱；（b）吸收波长
Figure 7. Effect of W1 on the absorption characteristics of the dual-wavelength narrow-bandwidth dielectric MA. (a) Absorption spectra; (b) absorption wavelength
图 9 n对双波长窄带宽介质MA吸收特性的影响。（a）吸收光谱；（b）吸收波长
Figure 9. Effect of n on the absorption characteristics of the dual-wavelength narrow-bandwidth dielectric MA. (a) Absorption spectra; (b) absorption wavelength
图 10 P对双波长窄带宽介质MA吸收特性的影响
Figure 10. Effect of P on the absorption characteristics of the dual-wavelength narrow-bandwidth dielectric MA
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