Félidj N, Laurent G, Aubard J, Lévi G, Hohenau A, Krenn J R, Aussenegg F R
Laboratoire ITODYS, Université Paris 7-Denis Diderot, CNRS UMR 7086, 1 rue Guy de la Brosse, F-75005 Paris, France.
J Chem Phys. 2005 Dec 8;123(22):221103. doi: 10.1063/1.2140699.
We study the dipolar coupling of gold nanoparticles arranged in regular two-dimensional arrays by extinction micro-spectroscopy. When the interparticle spacing approaches the plasmon resonance wavelength of the individual particles, an additional band of very narrow width emerges in the extinction spectrum. By systematically changing the particles dielectric environment, the particles shape, the grating constant and angle of incidence, we show how this band associated to a grating induced-resonance can be influenced in strength and spectral position. The spectral position can be qualitatively understood by considering the conditions for grazing grating orders whereas the strength can be related to the strength of dipolar scattering from the individual particles.
我们通过消光显微光谱法研究了排列成规则二维阵列的金纳米颗粒的偶极耦合。当颗粒间间距接近单个颗粒的等离子体共振波长时，消光谱中会出现一条宽度非常窄的附加谱带。通过系统地改变颗粒的介电环境、颗粒形状、光栅常数和入射角，我们展示了与光栅诱导共振相关的这条谱带在强度和光谱位置上是如何受到影响的。通过考虑掠射光栅级次的条件，可以定性地理解光谱位置，而强度则可以与单个颗粒的偶极散射强度相关联。
