Centre for Nanophotonics, FOM Institute AMOLF c/o Philips Research Laboratories, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands.
ACS Nano. 2011 Aug 23;5(8):6226-32. doi: 10.1021/nn201077r. Epub 2011 Jul 27.
We experimentally demonstrate the active control of the coupling strength between porphyrin dyes and surface plasmon polaritons supported by a thin gold layer. This control is externally exerted by a gas flow and is reversible. The hybridized exciton-polariton branches resulting from the exciton-plasmon coupling display a splitting proportional to the coupling strength of the light-matter interaction. The coupled system changes from the weak (no splitting) to the strong coupling regime (splitting of 130 meV) by controlling the effective oscillator strength in the dye layer, via exposure to nitrogen dioxide. The modification of the coupling strength of the system allows tailoring of the dispersion of the hybridized modes as well as of their group velocity.
我们通过实验演示了在薄金层支持下的卟啉染料和表面等离激元之间耦合强度的主动控制。这种控制是通过气体流动施加的，而且是可逆的。由激子-等离子体耦合产生的杂化激子-极化激元支显示出与光物质相互作用的耦合强度成正比的分裂。通过控制染料层中的有效振子强度，使系统从弱耦合（无分裂）到强耦合（130meV 的分裂），从而改变耦合系统的耦合强度。通过改变系统的耦合强度，可以对杂化模式的色散及其群速度进行调整。
