Feng Tianquan, Gong Chenyu, Liang Shiri, Yi Zao, Yi Yuxuan, Ma Can
School of Medicine, Yangtze University, Jingzhou, Hubei 434023, P.R. China.
School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, Hubei 434023, China.
Dalton Trans. 2024 May 7;53(18):8033-8040. doi: 10.1039/d4dt00657g.
We propose a structurally simple, innovative, and multifunctional mid-infrared broadband thermally tunable metamaterial absorption device. The absorption device consists of a three-layer structure, from bottom to top: Ti substrate, SiO dielectric layer, and patterned VO layer. Through temperature control, the average absorption intensity of the absorption device can vary between 0.08 and 0.94. The absorption device's absorption mechanism is rooted in the thermal phase-change characteristics exhibited by the topologically patterned VO. When the temperature is below 340 K, VO is in a dielectric state, resulting in near-total reflection performance in the mid-infrared range. When the temperature is above 340 K, VO undergoes a dielectric-to-metal transition, enabling the absorption device to achieve an average absorption rate of 94.12% in the ultra-wideband range of 6.26 μm-20.96 μm in the mid-infrared. This absorption range completely covers the atmospheric window wavelengths of 8 μm-14 μm, demonstrating high practical value. We explain the working mechanism of the absorption device from the perspective of the electromagnetic field. Subsequently, we study the variations in the absorption curve of the absorption device at different temperatures of VO and use the changes in the electric field at the same wavelength under different temperatures to explain the variations in absorption. Compared to previous work, our structure has only three layers in a single unit, making it easy to process and produce. Additionally, the absorption device's operating bandwidth and average absorption rate in the mid-infrared range have been significantly improved. Furthermore, the absorption device exhibits substantial incident angle tolerance and polarization insensitivity. We believe that this design has broad application potential in future optothermal conversion, infrared stealth, and thermal radiation.
我们提出了一种结构简单、创新且多功能的中红外宽带热可调超材料吸收器件。该吸收器件由三层结构组成，从下到上依次为：钛衬底、二氧化硅介电层和图案化的氧化钒层。通过温度控制，该吸收器件的平均吸收强度可在0.08至0.94之间变化。该吸收器件的吸收机制源于拓扑图案化氧化钒所呈现的热相变特性。当温度低于340 K时，氧化钒处于介电状态，在中红外范围内呈现近乎全反射的性能。当温度高于340 K时，氧化钒发生从介电态到金属态的转变，使得该吸收器件在中红外6.26 μm - 20.96 μm的超宽带范围内实现94.12%的平均吸收率。这一吸收范围完全覆盖了8 μm - 14 μm的大气窗口波长，具有很高的实用价值。我们从电磁场的角度解释了该吸收器件的工作机制。随后，我们研究了在氧化钒不同温度下吸收器件吸收曲线的变化，并利用不同温度下相同波长处电场的变化来解释吸收的变化。与先前的工作相比，我们的结构在单个单元中仅有三层，易于加工和生产。此外，该吸收器件在中红外范围内的工作带宽和平均吸收率得到了显著提高。而且，该吸收器件表现出较大的入射角容忍度和偏振不敏感性。我们认为这种设计在未来的光热转换、红外隐身和热辐射方面具有广阔的应用潜力。
