Manipulating the optical properties of pyramidal nanoparticle arrays
Manipulating the optical properties of pyramidal nanoparticle arrays
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DOI：
10.1021/jp063226i
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发表时间：
2006-07-27
影响因子：
3.3
通讯作者：
Odom, Teri W.
中科院分区：
文献类型：
--
作者：
Henzie, Joel;Shuford, Kevin L.;Odom, Teri W.
本文报道了各向异性金属纳米粒子二维阵列的方向依赖光学特性。这些研究是通过我们在均匀介电环境中封装和操纵具有复杂三维 (3D) 形状的排列粒子的简单程序而得以实现的。使用暗场或散射光谱，我们研究了嵌入聚（二甲基硅氧烷）（PDMS）基质中的 250 nm Au 金字塔壳的等离子共振。有趣的是，我们发现这些粒子阵列的散射光谱敏感地取决于入射白光相对于金字塔壳方向的方向和偏振。使用离散偶极近似的理论计算支持实验观察到的粒子方向相对于入射场的依赖性。这项工作提出了一种在 cm(2) 区域上手动排列粒子阵列的方法，并为明确定义的 3D 粒子的形状与其支持的等离子共振模式之间的关系提供了新的见解。
This paper reports the orientation-dependent optical properties of two-dimensional arrays of anisotropic metallic nanoparticles. These studies were made possible by our simple procedure to encapsulate and manipulate aligned particles having complex three-dimensional (3D) shapes inside a uniform dielectric environment. Using dark field or scattering spectroscopy, we investigated the plasmon resonances of 250-nm Au pyramidal shells embedded in a poly(dimethylsiloxane) (PDMS) matrix. Interestingly, we discovered that the scattering spectra of these particle arrays depended sensitively on the direction and polarization of the incident white light relative to the orientation of the pyramidal shells. Theoretical calculations using the discrete dipole approximation support the experimentally observed dependence on particle orientation with respect to incident field. This work presents an approach to manipulate-by hand-ordered arrays of particles over cm(2) areas and provides new insight into the relationship between the shape of well-defined, 3D particles and their supported plasmon resonance modes.