Hamdad Sarah, Diallo Amadou T, Chakaroun Mahmoud, Boudrioua Azzedine
Laboratoire Physique des Lasers, CNRS (UMR7538), Université Sorbonne Paris Nord, Sorbonne Paris Cité, 93430, Villetaneuse, France.
Sci Rep. 2022 Feb 25;12(1):3218. doi: 10.1038/s41598-022-07216-1.
We report the investigation of the influence of periodic metallic arrays on the emission properties of organic emitters. Beforehand, the study of the coupling process between nanoparticles through the analysis of the extinction spectra related to Rayleigh anomalies indicate the crucial role of those latter in defining the nature of the excited grating modes. The obtained results emphasis that Rayleigh Anomalies can be considered as the intermediate between individual plasmonic and collective photonic responses. Thereafter, the experimental and numerical studies of the lattice modes and their associated effects on the lifetime and emission directivity of nearby emitters indicate that tuning the geometrical grating parameters offers a possibility to select a particular coupling process from a localized effect to a far field response. Depending on the coupling strength, the emission can be strongly altered by increasing the density of states or providing diffractive orders. Eventually, this study reports that the Rayleigh Anomalies play the role of an excitation source which drives the nanoparticles to act as a set of diffractive objects for shaping the emission to be highly directive.
我们报告了关于周期性金属阵列对有机发光体发射特性影响的研究。此前，通过分析与瑞利异常相关的消光光谱来研究纳米颗粒之间的耦合过程，结果表明后者在定义激发光栅模式的性质方面起着关键作用。所得结果强调，瑞利异常可被视为个体等离子体响应和集体光子响应之间的中间状态。此后，对晶格模式及其对附近发光体寿命和发射方向性相关影响的实验和数值研究表明，调整几何光栅参数提供了一种从局部效应到远场响应选择特定耦合过程的可能性。根据耦合强度，发射可以通过增加态密度或提供衍射级次而被强烈改变。最终，本研究报告称，瑞利异常起到激发源的作用，驱动纳米颗粒充当一组衍射物体，以使发射具有高度方向性。
