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Anisotropic optical properties of semitransparent coatings of gold nanocaps

机译：金纳米帽的半透明涂层的各向异性光学性能

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摘要

An ordered array of cap-shaped gold nanoparticles has been prepared by vapor deposition onto polystyrene nanospheres supported on a glass substrate, The method of fabrication used imparts a significant anisotropy to the geometric and optical properties of the coating. The optical-absorption properties of these deposits have been measured using UV-vis spectrometry and simulated using a code based on the discrete dipole approximation. Because the nanocaps are not interconnected, they interact with incident light as individual particles with a plasmon resonance that depends upon wavelength and the polarization vector of the light. The resulting extinction peaks manifest in the upper visible and near-infrared regions of the electromagnetic spectrum. Surprisingly, varying the angle of incidence of the light (for a fixed polarization) has no effect on the optical properties of individual nanocaps. Calculations show that these phenomena may be readily interpreted in terms of dipole resonances excited across the longitudinal, transverse, and short-transverse directions of the nanocaps. Coatings comprised of arrays of these particles have the potential to serve as angularly and spectrally selective filters.
机译：通过将气相沉积到支撑在玻璃基材上的聚苯乙烯纳米球上，制备了有序的帽状金纳米颗粒阵列。所用的制造方法使涂层的几何和光学性能具有明显的各向异性。这些沉积物的光吸收特性已使用紫外可见光谱法进行了测量，并使用基于离散偶极近似的代码进行了模拟。因为纳米帽没有相互连接，所以它们作为单个粒子与入射光相互作用，其等离子体共振取决于光的波长和偏振向量。所产生的消光峰出现在电磁波谱的上部可见和近红外区域。出人意料的是，改变光的入射角（对于固定偏振）对单个纳米帽的光学特性没有影响。计算表明，这些现象可以很容易地解释为沿纳米帽的纵向，横向和短横向方向激发的偶极共振。由这些颗粒的阵列组成的涂层具有用作角度和光谱选择性滤光片的潜力。

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