Singh Kalpana, Panchenko Evgeniy, Nasr Babak, Liu Amelia, Wesemann Lukas, Davis Timothy J, Roberts Ann
School of Physics, University of Melbourne, VIC 3010, Australia.
Centre for Neural Engineering, The University of Melbourne, VIC 3010, Australia.
Beilstein J Nanotechnol. 2018 May 18;9:1491-1500. doi: 10.3762/bjnano.9.140. eCollection 2018.
Here we present the results of an investigation of resonances of azimuthal trimer arrangements of rectangular slots in a gold film on a glass substrate using cathodoluminescence (CL) as a probe. The variation in the CL signal collected from specific locations on the sample as a function of wavelength and the spatial dependence of emission into different wavelength bands provides considerable insight into the resonant modes, particularly sub-radiant modes, of these apertures. By comparing our experimental results with electromagnetic simulations we are able to identify a Fabry-Pérot mode of these cavities as well as resonances associated with the excitation of surface plasmon polaritons on the air-gold boundary. We obtain evidence for the excitation of dark (also known as sub-radiant) modes of apertures and aperture ensembles.
在此，我们展示了一项利用阴极发光（CL）作为探针，对玻璃衬底上金膜中矩形狭缝方位三聚体排列的共振进行研究的结果。从样品特定位置收集的CL信号随波长的变化以及发射到不同波长带的空间依赖性，为这些孔径的共振模式，特别是亚辐射模式，提供了相当多的见解。通过将我们的实验结果与电磁模拟进行比较，我们能够识别出这些腔的法布里 - 珀罗模式以及与空气 - 金边界上表面等离激元极化激元激发相关的共振。我们获得了孔径和孔径集合的暗（也称为亚辐射）模式激发的证据。
