Anulytė Justina, Žičkus Vytautas, Bužavaitė-Vertelienė Ernesta, Faccio Daniele, Balevičius Zigmas
Department of Laser Technologies, Center for Physical Sciences and Technology, Vilnius 10257, Lithuania.
School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK.
Nanophotonics. 2024 Aug 28;13(22):4091-4099. doi: 10.1515/nanoph-2024-0259. eCollection 2024 Sep.
Strong light-matter interactions have received a lot of attention, for example in the pursuit of plasmonic-excitonic structures as coherent light sources with low-power threshold. In this study, we investigate the influence of room temperature strong coupling between surface plasmon polaritons (SPP) and excitons on fluorescence lifetimes and photobleaching effects. Our plasmonic-photonic structure, comprising of thin silver (Ag) and gold (Au) layers with a Rhodamine 6G (R6G) dye layer, shows a clear shift in the plasmon resonance and R6G absorption lines with varying incident angles, indicative of strong coupling, with a measured Rabi splitting of approximately 90 meV. Fluorescence lifetime imaging microscopy (FLIM) was then employed to assess photobleaching, revealing a significant reduction in photobleaching effect for in strongly coupled plasmonic-excitonic structures compared to single Rhodamine R6G layers. Our findings indicate the pivotal role of strong light-matter interactions in reducing photobleaching effects and stabilizing fluorescence intensities, offering promising avenues for developing quantum multiparticle nanophotonic devices with enhanced stability and performance.
强光与物质的相互作用受到了广泛关注，例如在追求将等离子体激元 - 激子结构作为低功率阈值的相干光源方面。在本研究中，我们研究了室温下表面等离激元极化子（SPP）与激子之间的强耦合对荧光寿命和光漂白效应的影响。我们的等离子体 - 光子结构由薄银（Ag）和金（Au）层以及罗丹明6G（R6G）染料层组成，随着入射角的变化，等离子体共振和R6G吸收线出现明显偏移，这表明存在强耦合，测得的拉比分裂约为90毫电子伏特。然后采用荧光寿命成像显微镜（FLIM）来评估光漂白，结果表明与单个罗丹明R6G层相比，强耦合等离子体激元 - 激子结构中的光漂白效应显著降低。我们的研究结果表明强光与物质的相互作用在降低光漂白效应和稳定荧光强度方面起着关键作用，为开发具有更高稳定性和性能的量子多粒子纳米光子器件提供了有前景的途径。
