在颗粒金纳米天线中的德鲁德弛豫率。

Drude relaxation rate in grained gold nanoantennas.

机构信息

Birck Nanotechnology Center and School of Electrical and Computer Engineering, Purdue University, 1205 West State Street, West Lafayette, Indiana 47907, USA.

出版信息

Nano Lett. 2010 Mar 10;10(3):916-22. doi: 10.1021/nl9037246.

DOI:10.1021/nl9037246

PMID:20128610

Abstract

The effect of grain boundaries on the electron relaxation rate is significant even for large area noble metal films and more so for plasmonic nanostructures. Optical spectroscopy and X-ray diffraction show a substantial improvement in plasmon resonance quality for square-particle nanoantennas after annealing due to an enlarged grain size from 22 to 40 nm and improved grain boundaries described by the electron reflection coefficient. The electron relaxation rate due to the grains is shown to decrease by a factor of 3.2.

摘要

晶界对电子弛豫率的影响即使在大面积贵金属膜中也是显著的，在等离子体纳米结构中更是如此。光学光谱和 X 射线衍射表明，由于方形粒子纳米天线的晶粒尺寸从 22nm 增大到 40nm，以及电子反射系数描述的晶界得到改善，退火后等离子体共振质量得到了显著提高。由于晶粒的存在，电子弛豫率降低了 3.2 倍。