Mid-wave and long-wave infrared dual-band stacked metamaterial absorber for broadband with high refractive index sensitivity
Mid-wave and long-wave infrared dual-band stacked metamaterial absorber for broadband with high refractive index sensitivity
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具有高折射率灵敏度的宽带中波和长波红外双波段堆叠超材料吸收器
DOI：
10.1364/ao.384027
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发表时间：
2020-03-20
期刊：
影响因子：
1.9
通讯作者：
Lai, Jianjun
中科院分区：
文献类型：
--
作者：
Hou, Enzhu;Meng, Dejia;Lai, Jianjun
设计了一种基于局域表面等离子体共振的双波段超材料吸波材料，该吸波材料由周期性排列的堆叠纳米盘结构组成。该结构单元由两个介电层和三个金属层组成。基于时域有限差分法，在垂直入射平面光的条件下，得到了中波红外和长波红外(MWIR/LWIR)的两个吸收峰，其吸收大于98%。该吸收体具有良好的入射状态容差特性。我们可以通过改变堆积圆盘结构的半径来调制MWIR/LWIR的吸收峰，通过在平面上集成不同尺寸的元素来实现MWIR和LWIR的双波段宽带吸收。带宽为3.2~4.3µm的中波红外平均吸收率为71%，带宽为8.5~11.5微米的中波红外平均吸收率为88%，同时该结构还具有有效的折射率敏感特性。在RI1.8-2范围内，LWIR和MWIR的最大RI灵敏度分别为1085 nm/折射率单位(RIU)和1472 nm/RIU。(C)2020年美国光学学会
A dual-band metamaterial absorber based on local surface plasmon resonance is designed, which is composed of a periodic arrangement of stacked nanodisk structures. The structure unit consists of two dielectric layers and three metal layers. Based on the finite difference time domain method, under the condition of vertically incident plane light, two absorption peaks in the mid-wave infrared and long-wave infrared (MWIR/LWIR) are obtained, and the absorption is greater than 98%. The absorber has good incident state tolerance characteristics. We can modulate the MWIR/LWIR absorption peaks by changing the radius of the stacked disk structure, and MWIR and LWIR dual-band broadband absorption can be achieved by integrating different size elements in the plane. The average absorption is 71% for MWIR with 1.1 mu m band width from 3.2 to 4.3 mu m and 88% for LWIR with 3 mu m band width from 8.5 to 11.5 mu m. At the same time, the structure also has effective refractive index (RI) sensitivity characteristics. In the RI range of 1.8-2, the maximum RI sensitivity of the LWIR and the MWIR is 1085 nm/refractive index unit (RIU) and 1472 nm/RIU, respectively. (C) 2020 Optical Society of America