Gopinath Ashwin, Boriskina Svetlana V, Feng Ning-Ning, Reinhard Björn M, Dal Negro Luca
Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215-2421, USA.
Nano Lett. 2008 Aug;8(8):2423-31. doi: 10.1021/nl8013692. Epub 2008 Jul 23.
In this paper, we combine experimental dark-field scattering spectroscopy and accurate electrodynamics calculations to investigate the scattering properties of two-dimensional plasmonic lattices based on the concept of aperiodic order. In particular, by discussing visible light scattering from periodic, Fibonacci, Thue-Morse and Rudin-Shapiro lattices fabricated by electron-beam lithography on transparent quartz substrates, we demonstrate that deterministic aperiodic Au nanoparticle arrays give rise to broad plasmonic resonances spanning the entire visible spectrum. In addition, we show that far-field diffractive coupling is responsible for the formation of characteristic photonic-plasmonic scattering modes in aperiodic arrays of metal nanoparticles. Accurate scattering simulations based on the generalized Mie theory approach support our experimental results. The possibility of engineering complex metal nanoparticle arrays with distinctive plasmonic resonances extending across the entire visible spectrum can have a significant impact on the design and fabrication of novel nanodevices based on broadband plasmonic enhancement.
在本文中，我们结合实验暗场散射光谱和精确的电动力学计算，基于非周期序的概念研究二维等离子体晶格的散射特性。特别是，通过讨论由电子束光刻技术在透明石英衬底上制备的周期性、斐波那契、图厄 - 摩尔斯和鲁丁 - 夏皮罗拉晶格的可见光散射，我们证明确定性非周期金纳米颗粒阵列会产生跨越整个可见光谱的宽等离子体共振。此外，我们表明远场衍射耦合是金属纳米颗粒非周期阵列中特征性光子 - 等离子体散射模式形成的原因。基于广义米氏理论方法的精确散射模拟支持了我们的实验结果。设计具有跨越整个可见光谱的独特等离子体共振的复杂金属纳米颗粒阵列的可能性，可能会对基于宽带等离子体增强的新型纳米器件的设计和制造产生重大影响。
