逾渗阈值附近银膜的可调非对称反射率
Tunable asymmetric reflectance in silver films near the percolation threshold
摘要：
我们报道了具有可调光学反射不对称性的连续纳米结构银膜的光学特性。使用多步骤工艺获得膜，其中纳米晶银膜首先化学沉积在玻璃基底上，然后通过热真空沉积用另外的银涂覆。所得的膜表现出反射率不对称性，其分散体可以在符号和幅度上进行调谐，以及通用的、可调谐的光谱交叉点。我们得到的光学响应和电荷输运在这些薄膜之间的相关性，与光谱交叉点指示的发病的电荷渗透。这样的宽带、色散可调的非对称反射器可以在未来的光捕获系统中找到用途。
英文摘要：
We report on the optical characterization of semicontinuous nanostructured silver films exhibiting tunable optical reflectance asymmetries. The films are obtained using a multi-step process, where a nanocrystalline silver film is first chemically deposited on a glass substrate and then subsequently coated with additional silver via thermal vacuum-deposition. The resulting films exhibit reflectance asymmetries whose dispersions may be tuned both in sign and in magnitude, as well as a universal, tunable spectral crossover point. We obtain a correlation between the optical response and charge transport in these films, with the spectral crossover point indicating the onset of charge percolation. Such broadband, dispersion-tunable asymmetric reflectors may find uses in future light-harvesting systems.
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