绘制等离子体模式的偏振图案可揭示纳米颗粒的对称性。

Mapping the polarization pattern of plasmon modes reveals nanoparticle symmetry.

作者信息

Schubert Olaf, Becker Jan, Carbone Luigi, Khalavka Yuriy, Provalska Tetyana, Zins Inga, Sönnichsen Carsten

机构信息

Institute of Physical Chemistry, University of Mainz, Mainz, Germany.

出版信息

Nano Lett. 2008 Aug;8(8):2345-50. doi: 10.1021/nl801179a. Epub 2008 Jul 1.

DOI:10.1021/nl801179a

PMID:18590314

Abstract

We study the wavelength and polarization dependent plasmon resonances of single silver and gold nanorods, triangles, cubes, and dimers with a novel single particle spectroscopy method (RotPOL). In RotPOL, a rotating wedge-shaped polarizer encodes the full polarization information of each particle within one image. This reveals the symmetry of the particles and their plasmon modes, allows analyzing inhomogeneous samples and the monitoring of particle shape changes during growth in situ.

摘要

我们使用一种新型单粒子光谱方法（RotPOL）研究了单个银和金纳米棒、三角形、立方体及二聚体的波长和偏振相关的等离子体共振。在RotPOL中，一个旋转的楔形偏振器在一幅图像内编码每个粒子的完整偏振信息。这揭示了粒子的对称性及其等离子体模式，能够分析不均匀样品，并原位监测粒子在生长过程中的形状变化。