Guan Yongji, Fan Jiajun, Wang Yuyang, Li Xiaoxiang, Zhang Xiaoping
Opt Express. 2024 Aug 12;32(17):29174-29188. doi: 10.1364/OE.530613.
In this study, a frustum-shaped addition was made to a cylindrical absorber unit, utilizing 1-ethyl-3-methylimidazolium dicyanamide ionic liquid (IL) to create a transparent all-dielectric liquid metamaterial absorber (A-D ILMMA). The A-D ILMMA achieved over 90% absorption efficiency across 4.86-50.00 GHz, with a 165% relative absorption bandwidth. It maintained robust performance across various polarization angles and achieved over 77% absorption at incident angles of up to 60°. Owing to the excellent thermal stability of the IL, the A-D ILMMA consistently maintained an absorption rate of over 90% across a temperature range from 25 °C to 100 °C. The high absorption rates were attributed to synergistic impedance matching and electromagnetic energy loss. The experimental results confirmed over 90% absorption in the ultra-broadband range of 7.10 GHz to 40.00 GHz, demonstrating the excellent physicochemical properties of ILs and their potential applications.
在本研究中，在圆柱形吸收器单元上添加了一个截头圆锥体形状的部件，利用1-乙基-3-甲基咪唑二氰胺离子液体（IL）制造了一种透明全介质液体超材料吸收器（A-D ILMMA）。该A-D ILMMA在4.86-50.00 GHz范围内实现了超过90%的吸收效率，相对吸收带宽为165%。它在各种偏振角下都保持了稳健的性能，在高达60°的入射角下实现了超过77%的吸收。由于IL具有出色的热稳定性，A-D ILMMA在25°C至100°C的温度范围内始终保持超过90%的吸收率。高吸收率归因于协同阻抗匹配和电磁能量损耗。实验结果证实，在7.10 GHz至40.00 GHz的超宽带范围内吸收率超过90%，证明了离子液体优异的物理化学性质及其潜在应用。
