Department of Physics and Astronomy, Rice University, 6100 Main Street, Houston, Texas 77005, United States.
Nano Lett. 2011 Nov 9;11(11):5034-7. doi: 10.1021/nl203085t. Epub 2011 Oct 11.
Plasmonic nanowires with sub-100-nm rectangular cross sections were found to exhibit a strong transverse plasmon peak at visible wavelengths. By correlating atomic force microscopy measurements of individual nanobelts with their dark-field scattering spectra, it is seen that the transverse peak tunes with cross-sectional aspect ratio. Simulations revealed that the scattering plasmonic modes are transverse antisymmetric excitations across the nanobelt width. Unlike larger diameter silver nanowires, these nanobelts exhibit sharp, tunable plasmon resonances similar to those of nanoparticles.
具有亚 100nm 矩形横截面的等离子体纳米线在可见波长处表现出很强的横向等离子体峰。通过将单个纳米带的原子力显微镜测量与其暗场散射光谱相关联，可以看出横向峰随横截面纵横比而变化。模拟表明，散射等离子体模式是横跨纳米带宽度的横向反对称激发。与较大直径的银纳米线不同，这些纳米带表现出类似纳米粒子的尖锐、可调谐等离子体共振。
