Localized surface-plasmon resonances in periodic nondiffracting metallic nanoparticle and nanohole arrays
Localized surface-plasmon resonances in periodic nondiffracting metallic nanoparticle and nanohole arrays
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DOI：
10.1103/physrevb.79.073412
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发表时间：
2009-02-01
影响因子：
3.7
通讯作者：
Barnes, W. L.
中科院分区：
文献类型：
--
作者：
Parsons, J.;Hendry, E.;Barnes, W. L.
我们比较了周期性无衍射金属纳米颗粒和纳米孔阵列的光学响应。从这两种结构的实验数据显示，在其波长相关的透射率，通过数值模拟，我们确定为由于局部表面等离子体共振与纳米粒子/纳米孔的激发显着的最小值。我们的主要发现是，虽然纳米颗粒阵列的光学响应在很大程度上是独立的粒子间的分离，从纳米孔阵列的响应显示出显着的依赖于孔间的分离。我们将这种效应归因于与金属膜相关的对称表面等离子体极化激元介导的局部表面等离子体共振之间的耦合。进一步的数值模拟支持这一观点。
We compare the optical response of periodic nondiffracting metallic nanoparticle and nanohole arrays. Experimental data from both structures show a pronounced minimum in their wavelength-dependent transmittance that, through numerical modeling, we identify as being due to the excitation of localized surface-plasmon resonances associated with the nanoparticles/nanoholes. Our main finding is that, while the optical response of the nanoparticle arrays is largely independent of interparticle separation, the response from nanohole arrays shows a marked dependence on interhole separation. We attribute this effect to coupling between localized surface-plasmon resonances mediated by the symmetric surface plasmon-polaritons associated with the metal film. Further numerical modeling supports this view.