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首页> 外文期刊>Nanotechnology >Linear dichroism and optical anisotropy of silver nanoprisms in polymer films
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Linear dichroism and optical anisotropy of silver nanoprisms in polymer films

机译：聚合物薄膜中银纳米棱镜的线性二向色性和光学各向异性

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摘要

We present optical studies of two different size distributions of silver triangular nanoprisms, one with a dipole resonance at 520 nm and the other with a dipole resonance at 650 nm, placed in different media. Significant wavelength-dependent depolarization of scattered light from the silver nanoprisms suspended in water indicates strong interference of multiple surface plasmon resonant modes in the same particle. We use this depolarization as a probe of light scattering by the nanoprisms in a lipid solution due to the rejection of a polarized background scattering. Also, the silver nanoprisms were embedded in a polyvinyl alcohol polymer matrix and oriented by stretching the polymeranoprism nanocomposite films. We observe significantly increased linear dichroism in the region associated with the plasmonic in-plane dipole mode upon stretching. Additionally, there is a weaker linear dichroism in the region associated with out-of-plane modes, which vanish in the extinction spectrum of the stretched nanocomposite film.
机译：我们目前对银三角纳米棱镜的两种不同尺寸分布的光学研究进行了研究，一种在520 nm处发生偶极共振，另一种在650 nm处发生偶极共振，它们被放置在不同的介质中。来自悬浮在水中的银纳米棱镜的散射光对波长的依赖于波长的显着去极化表明同一粒子中多个表面等离子体共振模式的强烈干涉。我们将这种去极化作为脂质溶液中纳米棱镜的光散射的探针，这是由于极化背景散射的排斥所致。而且，将银纳米棱镜嵌入聚乙烯醇聚合物基质中，并通过拉伸聚合物/纳米棱镜纳米复合材料薄膜进行取向。我们观察到在拉伸时与等离子面内偶极子模式相关的区域线性二色性显着增加。另外，在与平面外模式相关的区域中存在较弱的线性二向色性，其在拉伸的纳米复合膜的消光光谱中消失。

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