Light: Science & Applications ( IF 19.4 ) Pub Date : 2020-02-04 , DOI: 10.1038/s41377-020-0242-y Sohail A Jalil 1 , Bo Lai 1 , Mohamed ElKabbash 1 , Jihua Zhang 1 , Erik M Garcell 1 , Subhash Singh 1 , Chunlei Guo 1
Direct femtosecond (fs) laser processing is a maskless fabrication technique that can effectively modify the optical, electrical, mechanical, and tribological properties of materials for a wide range of potential applications. However, the eventual implementation of fs-laser-treated surfaces in actual devices remains challenging because it is difficult to precisely control the surface properties. Previous studies of the morphological control of fs-laser-processed surfaces mostly focused on enhancing the uniformity of periodic microstructures. Here, guided by the plasmon hybridisation model, we control the morphology of surface nanostructures to obtain more control over spectral light absorption. We experimentally demonstrate spectral control of a variety of metals [copper (Cu), aluminium (Al), steel and tungsten (W)], resulting in the creation of broadband light absorbers and selective solar absorbers (SSAs). For the first time, we demonstrate that fs-laser-produced surfaces can be used as high-temperature SSAs. We show that a tungsten selective solar absorber (W-SSA) exhibits excellent performance as a high-temperature solar receiver. When integrated into a solar thermoelectric generation (TEG) device, W-SSA provides a 130% increase in solar TEG efficiency compared to untreated W, which is commonly used as an intrinsic selective light absorber.
中文翻译:
飞秒激光处理金属的光谱吸收控制及其在太阳能热器件中的应用
直接飞秒 (fs) 激光加工是一种无掩模制造技术,可以有效地改变材料的光学、电气、机械和摩擦学特性,适用于广泛的潜在应用。然而,在实际设备中最终实现 fs 激光处理的表面仍然具有挑战性,因为难以精确控制表面特性。先前对 fs 激光加工表面形态控制的研究主要集中在提高周期性微结构的均匀性上。在这里,在等离子体杂交模型的指导下,我们控制表面纳米结构的形态以获得对光谱光吸收的更多控制。我们通过实验证明了多种金属 [铜 (Cu)、铝 (Al)、钢和钨 (W)] 的光谱控制,导致产生宽带光吸收器和选择性太阳能吸收器(SSA)。我们首次证明 fs 激光产生的表面可用作高温 SSA。我们表明,钨选择性太阳能吸收器(W-SSA)作为高温太阳能接收器表现出优异的性能。当集成到太阳能热电发电 (TEG) 设备中时,与未处理的 W(通常用作本征选择性光吸收剂)相比,W-SSA 的太阳能 TEG 效率提高了 130%。