Sadeghi Seyed M, Gutha Rithvik R, Wing Waylin J
Opt Lett. 2016 Jul 15;41(14):3367-70. doi: 10.1364/OL.41.003367.
We study control of optical coupling of plasmon resonances in metallic nanoantenna arrays using ultrathin layers of silicon. This technique allows one to establish and tune plasmonic lattice modes of such arrays, demonstrating a controlled transformation from the localized surface plasmon resonances of individual nanoantennas to their optimized collective lattice modes. Depending on the polarization and incident angle of light, our results support two different types of the silicon-induced plasmonic lattice resonances. For s-polarization these resonances follow the Rayleigh anomaly, while for p-polarization an increase in the incident angle makes the lattice resonances significantly narrower and slightly blueshifted.
我们研究了利用超薄硅层对金属纳米天线阵列中等离激元共振的光学耦合进行控制。该技术使人们能够建立并调节此类阵列的等离激元晶格模式，展示了从单个纳米天线的局域表面等离激元共振到其优化的集体晶格模式的可控转变。根据光的偏振和入射角，我们的结果支持两种不同类型的硅诱导等离激元晶格共振。对于s偏振，这些共振遵循瑞利异常，而对于p偏振，入射角的增加会使晶格共振显著变窄并略微蓝移。
