利用磁寻址中间相控制金纳米棒的红外二向色性
Infrared dichroism of gold nanorods controlled using a magnetically addressable mesophase
摘要：
金纳米棒具有独特的光学性质，这使得它们成为使用“自下而上”策略构建纳米结构材料的有希望的候选者。我们通过在层状中间相内插入金和氧化铁纳米棒来配制具有各向异性光学性质的稳定块体材料。定量测量的序参量，通过模拟的吸收光谱表明，介质是宏观上对齐由外部磁场定义的方向。在电场下，该系统在红外范围内，在金纳米棒的纵向等离子体激元峰的位置（约1200 nm）处表现出显著的吸收二向色性，表明这些颗粒在层状相的水层内的强限制。这种方法可以产生柔软且可寻址的光学元件。
英文摘要：
Gold nanorods have unique optical properties, which make them promising candidates for building nano-structured materials using a "bottom-up" strategy. We formulate stable bulk materials with anisotropic optical properties by inserting gold and iron oxide nanorods within a lamellar mesophase. Quantitative measurements of the order parameter by modelling the absorbance spectra show that the medium is macroscopically aligned in a direction defined by an external magnetic field. Under field, the system exhibits significant absorption dichroism in the infrared range, at the position of the longitudinal plasmon peak of the gold nanorods (about 1200 nm), indicating strong confinement of these particles within the water layers of the lamellar phase. This approach can yield soft and addressable optical elements.
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