Institut für Physik, Carl von Ossietzky Universität Oldenburg, Germany.
ACS Nano. 2010 Dec 28;4(12):7559-65. doi: 10.1021/nn101973p. Epub 2010 Nov 17.
We demonstrate an ultrafast manipulation of the Rabi splitting energy Ω(R) in a metal-molecular aggregate hybrid nanostructure. Femtosecond excitation drastically alters the optical properties of a model system formed by coating a gold nanoslit array with a thin J-aggregated dye layer. Controlled and reversible transient switching from strong (Ω(R) ≃ 55 meV) to weak (Ω(R) ≈ 0) coupling on a sub-ps time scale is directly evidenced by mapping the nonequilibrium dispersion relations of the coupled excitations. Such a strong, externally controllable coupling of excitons and surface plasmon polaritons is of considerable interest for ultrafast all-optical switching applications in nanoscale plasmonic circuits.
我们展示了在金属-分子聚集体杂化纳米结构中对拉比分裂能 Ω(R) 的超快操控。飞秒激发极大地改变了由金纳米狭缝阵列涂覆薄 J-聚集体染料层形成的模型系统的光学性质。通过绘制耦合激发的非平衡色散关系，直接证明了在亚皮秒时间尺度上从强（Ω(R) ≃ 55 meV）到弱（Ω(R) ≈ 0）耦合的可控和可逆瞬态切换。这种激子和表面等离激元极化激元的强、外部可控耦合对于纳米尺度等离子体电路中的超快全光开关应用具有重要意义。
