...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Surface plasmons and strong light-matter coupling in metallic nanoshells
【24h】

Surface plasmons and strong light-matter coupling in metallic nanoshells

机译：金属纳米壳中的表面等离子体激元和强光-质耦合

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A theory of the interaction between a radiating dipole and the plasmonie excitations of a spherical metallic nanoshell in the quasistatic approximation is formulated. After a derivation of surface plasmon frequencies and a comparison with the corresponding modes of metal spheres and cavities, we introduce an expression for the effective volume for any position of the dipole inside or outside the nanoshell, describing the local electromagnetic field enhancement in analogy to other cavity-QED systems. The modification of the dipole decay rate is calculated as a function of frequency for various geometrical parameters, and it reflects the spectrum of spherelike and cavity-like surface plasmon excitations. We then give a formulation of emission spectra, suitable for describing light-matter interaction beyond perturbation theory, and study the conditions for the strong coupling regime to occur. By suitably tuning the geometrical parameters of the nanoshell and by choosing the order of surface plasmon modes to minimize the effective volume, a vacuum Rabi splitting can occur in emission spectra for dipole oscillator strengths as small as a few units, which can be easily achieved with organic molecules or quantum dots. The most favorable situation for strong coupling is when the dipole is located inside the nanoshell. Surprisingly, this dipole couples with spherelike modes more strongly than with cavity-like ones, if the shell is thin enough. As a conclusion, metallic nanoshells turn out to be a suitable platform in order to investigate the strong-coupling regime of light-matter interaction by exploiting surface plasmon resonances.
机译：建立了准偶极近似中的辐射偶极子与球形金属纳米壳的等离激元激发之间相互作用的理论。在推导了表面等离激元频率并与金属球和空腔的相应模式进行比较之后，我们引入了纳米壳内部或外部偶极子任何位置的有效体积的表达式，以类似于其他方法的方式描述了局部电磁场的增强。腔QED系统。对于各种几何参数，偶极子衰减率的修正是作为频率的函数来计算的，它反映了球状和腔状表面等离子体激元激发的光谱。然后，我们给出了一个发射光谱的公式，适用于描述微扰理论以外的光-物质相互作用，并研究了强耦合机制发生的条件。通过适当调整纳米壳的几何参数并选择表面等离振子模式的顺序以最小化有效体积，可以在发射光谱中发生真空拉比分裂，从而使偶极子振荡器的强度小至几个单位，这很容易实现。有机分子或量子点。强耦合的最有利情况是偶极子位于纳米壳内部。令人惊讶的是，如果壳足够薄，则该偶极子与球形模的耦合比与腔模的偶合更强。结论是，为了利用表面等离振子共振研究光-物质相互作用的强耦合机制，金属纳米壳被证明是一个合适的平台。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号