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arXiv 1603.09403cond-mat.mes-hallphysics.optics
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等离子体Purcell因子和表面等离子体的耦合效率。解决和控制光学纳米粒子的意义

Plasmonic Purcell factor and coupling efficiency to surface plasmons. Implications for addressing and controlling optical nanosources

G. Colas des Francs, J. Barthes, A. Bouhelier, J. C. Weeber, A. Dereux

摘要:

Purcell因子$F_p$是腔量子电动力学(cQED)中的关键量,其量化偶极发射极和腔模式之间的耦合率。它的简单形式$F_p\propto Q/V$揭示了增强和控制光-物质相互作用的可能策略。实际上,由于i)基于cQED的高品质因数$Q$或ii)基于纳米光子学和等离子体激元学的低模态体积$V$,实现了有效的光-物质相互作用。在过去的十年中,已经做了很大的努力,以获得一个等离子体珀塞尔因子,以转置cQED概念的nanocale,在标度律的方法。在这项工作中,我们讨论了离域(SPP)和本地化(LSP)表面等离子体激元的等离子体珀塞尔因子,并简要总结了预期的应用纳米光子学。基于SPP共振形状(洛伦兹或法诺轮廓),我们导出了离域等离子体激元耦合率的封闭表达式。的品质因数因子和模式限制的SPP和LSP进行量化,展示了他们强烈的亚波长行为。

英文摘要:

The Purcell factor $F_p$ is a key quantity in cavity quantum electrodynamics (cQED) that quantifies the coupling rate between a dipolar emitter and a cavity mode. Its simple form $F_p\propto Q/V$ unravels the possible strategies to enhance and control light-matter interaction. Practically, efficient light-matter interaction is achieved thanks to either i) high quality factor $Q$ at the basis of cQED or ii) low modal volume $V$ at the basis of nanophotonics and plasmonics. In the last decade, strong efforts have been done to derive a plasmonic Purcell factor in order to transpose cQED concepts to the nanocale, in a scale-law approach. In this work, we discuss the plasmonic Purcell factor for both delocalized (SPP) and localized (LSP) surface-plasmon-polaritons and briefly summarize the expected applications for nanophotonics. On the basis of the SPP resonance shape (Lorentzian or Fano profile), we derive closed form expression for the coupling rate to delocalized plasmons. The quality factor factor and modal confinement of both SPP and LSP are quantified, demonstrating their strongly subwavelength behaviour.

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