Low-threshold resonance amplification of out-of-plane lattice plasmons in active plasmonic nanoparticle arrays
Low-threshold resonance amplification of out-of-plane lattice plasmons in active plasmonic nanoparticle arrays
复制标题
活性等离子体纳米颗粒阵列中面外晶格等离子体的低阈值共振放大
DOI：
10.1088/2040-8978/16/6/065003
复制
发表时间：
2014-06-01
影响因子：
2.1
通讯作者：
Liang, Erjun
中科院分区：
文献类型：
--
作者：
Ding, Pei;Cai, Genwang;Liang, Erjun
从理论上研究了增益辅助二维金属纳米粒子(NP)阵列中离面晶格等离子体(OLPs)的共振放大。基于OLPS的散射器具有角度相关的近场光学特性，可以通过调节入射光的角度来控制其增益阈值。表面等离子体激元阵列的表面等离子体激元(SP)放大阈值比面内晶格等离子体激元(ILPS)低。对不同入射角激发的ILPS和OLP的电场局部化和增强进行了并列比较，以了解它们不同的跳跃性能。结果还表明，NP阵列中晶格等离子激元的增益阈值远低于单个NPs中局域SP的增益阈值。
The resonance amplification of out-of-plane lattice plasmons (OLPs) in gain-assisted 2D metallic nanoparticle (NP) arrays is investigated theoretically. Due to the angle-dependent near-field optical properties, the gain threshold of OLPs-based spaser can be controlled by adjusting the angle of incident light. OLPs are demonstrated to exhibit lower thresholds for surface plasmon (SP) amplification than the in-plane lattice plasmons (ILPs) for active plasmonic NP arrays. Side-by-side comparisons of the E-field localizations and enhancements for the ILPs and OLPs excited at different incident angle are performed to understand their different spasing performance. The results also indicate that the gain thresholds of lattice plasmons in NP arrays are much lower than those of localized SPs in individual NPs.