Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
Nano Lett. 2010 Jan;10(1):243-9. doi: 10.1021/nl903409x.
Single-molecule detection via surface-enhanced Raman scattering (SERS) has raised great interest over the past decade. The usual approach toward this goal is to harness the strong surface plasmon resonance of light with complex metallic nanostructures, such as particle aggregates, two-particle gaps, sharp tips, or particles with sharp apexes. Here we propose another route toward the goal by introducing gain medium into single metal nanoparticles with simple geometry. Our calculations show that cubic gold nanobox particles that contain a gain material within the core can create an extremely high enhancement factor of local field intensity larger than 10(8) and a SERS enhancement factor on the order of 10(16)-10(17).
通过表面增强拉曼散射（SERS）进行单分子检测在过去十年中引起了极大的兴趣。实现这一目标的常用方法是利用复杂的金属纳米结构（如颗粒聚集物、双粒子间隙、尖锐尖端或具有尖锐顶点的颗粒）中的强表面等离激元共振。在这里，我们通过在具有简单几何形状的单个金属纳米粒子中引入增益介质来提出另一种实现该目标的方法。我们的计算表明，包含核心内增益材料的立方金纳米盒颗粒可以产生大于 10^8 的局部场强增强因子和 10^16-10^17 的 SERS 增强因子。
