Optical Analysis and Optimization of Micropyramid Texture for Thermal Radiation Control
Optical Analysis and Optimization of Micropyramid Texture for Thermal Radiation Control
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DOI：
10.1080/15567265.2021.1958960
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发表时间：
2021-08-05
影响因子：
4.1
通讯作者：
Lee，Jaeho
中科院分区：
文献类型：
--
作者：
Sullivan，Jonathan;Yu，Ziqi;Lee，Jaeho
虽然金字塔纹理的抗反射特性被广泛使用，但它们用于热辐射控制的使用受到的关注相对较少，并且对设计优化的几何参数的理解也没有很好地建立。在这里，我们使用有限差分时域模拟结合算法来优化微结构金属，陶瓷和聚合物材料的热特性。我们的模拟表明，金字塔的高基比是一个有效的参数，在开发一个工程热响应。对于镍，在0.5-4 µm的基跨上具有2-4个高基比的微金字塔在300-2500 nm波长下提供近乎完美的吸收。电场分析表明，光学特性是由局域共振和场约束效应驱动的。我们基于热成本函数的优化已经导致微金字塔纹理，其可以对加热或冷却产生显著影响，例如镍的太阳能吸收从337增加到982 W/m2，氧化铝的热发射从106增加到170 W/m2，PDMS的热发射从160增加到172 W/m2。这项工作不仅提供了理解的热辐射控制的微金字塔属性，但也提出了一个算法过程，可用于有效的光学-热优化的几何形状超越微金字塔。
While anti-reflective properties of pyramid texture are widely used, their use for thermal radiation control has received relatively little attention and the understanding of geometric parameters for design optimization is not well established. Here we use finite-difference time-domain simulations in conjunction with an algorithm to optimize thermal characteristics of micropyramid-textured metallic, ceramic, and polymer materials. Our simulations indicate that the pyramid height-to-base ratio is an effective parameter in developing an engineered thermal response. For nickel, the micropyramids with 2–4 height-to-base ratios over 0.5–4 µm base spans provide near-perfect absorption in 300–2500 nm wavelengths. The electric field analysis shows the optical properties are driven by the effects of localized resonance and field confinement. Our thermal cost function-based optimization has led to micropyramid texture that can have a significant impact on heating or cooling such as the solar absorption increase in nickel from 337 to 982 W/m2, the thermal emission increase in alumina from 106 to 170 W/m2, and the thermal emission increase in PDMS from 160 to 172 W/m2. This work not only provides the understanding of micropyramid properties for thermal radiation control but also presents an algorithmic process that could be used for efficient optical-thermal optimization of geometries beyond micropyramids.