Helical Metal Nanoparticle Assemblies with Defects: Plasmonic Chirality and Circular Dichroism
Helical Metal Nanoparticle Assemblies with Defects: Plasmonic Chirality and Circular Dichroism
复制标题
DOI：
10.1021/jp204265x
复制
发表时间：
2011-07-14
影响因子：
3.7
通讯作者：
Govorov, Alexander O.
中科院分区：
文献类型：
--
作者：
Fan, Zhiyuan;Govorov, Alexander O.
具有螺旋排列的金属纳米颗粒结构能够产生强的光学手性和相关的圆二色性（CD）。这些手性结构中的CD效应来自于非手性纳米颗粒之间的电磁偶极-偶极相互作用。通常，计算的CD谱对参数敏感。CD光谱的形状取决于螺旋螺距和半径，有时还取决于螺旋中的颗粒数量。模拟几种几何形状，我们能够确定的CD光谱是非常稳定的缺陷或混乱的参数集。这些结果对于设计在可见光区具有强光学手性的新型纳米复合材料具有重要意义。
Metal nanoparticle structures with a helical arrangement are able to create strong optical chirality and associated circular dichroism (CD). The CD effect in these chiral structures comes from the electromagnetic dipole-dipole interaction between nonchiral nanopartides. In general, the calculated CD spectra are sensitive to the parameters. The shape of the CD spectrum depends on the helix pitch and radius and, sometimes, on the number of particles in a helix. Simulating several geometries, we were able to identify the sets of parameters for which the CD spectrum is very stable against defects or disorder. These results are important for designing novel nanocomposite materials with strong optical chirality in the visible wavelength region.