Enhanced Two-Dimensional Exciton Propagation via Strong Light–Matter Coupling with Surface Lattice Plasmons
Enhanced Two-Dimensional Exciton Propagation via Strong Light–Matter Coupling with Surface Lattice Plasmons
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DOI：
10.1021/acsphotonics.3c00466
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发表时间：
2023-05
期刊：
影响因子：
7
通讯作者：
Linrui Jin;Alexander D. Sample;Dewei Sun;Yao Gao;Shibin Deng;Ran Li;L. Dou;Teri W. Odom;Libai Huang
中科院分区：
文献类型：
--
作者：
Linrui Jin;Alexander D. Sample;Dewei Sun;Yao Gao;Shibin Deng;Ran Li;L. Dou;Teri W. Odom;Libai Huang
激子-极化激元-混合激子-光子准粒子-通过利用其光子成分的性质而使激发的长程相干输运成为可能。然而，大多数强耦合的实验都是基于半导体法布里-珀罗微腔。在这里，我们报告了一个开放的和多功能的激子极化激元平台，通过整合二维铅卤化物钙钛矿与等离子体纳米颗粒阵列，支持激子和表面晶格共振之间的杂交在强耦合制度。受益于开放式架构，我们直接可视化极化激元增强激子输运通过角度依赖的瞬态吸收显微镜测量。观察到的输运增强延伸到皮秒的时间尺度，导致超过1个数量级的改善激子迁移，从100纳米到100纳米。我们提出了一个极化激元介导的激子输运模型，得到了光子分数为1.40%的态的平均极化激元速度为1.1 × 106 m/s.这些结果表明，等离子体激元粒子阵列作为一个通用的和适应性强的腔，以提高激子输运。
Exciton–polaritons─hybrid exciton–photon quasi-particles─have enabled exciting long-range coherent transport by taking advantage of the properties of their photonic component. However, most experimental demonstrations of strong coupling have been based on semiconductor Fabry–Pérot microcavities. Here, we report an open and versatile exciton–polariton platform by integrating two-dimensional lead halide perovskites with plasmonic nanoparticle arrays, which support hybridization between excitons and surface lattice resonances in the strong coupling regime. Benefitting from the open architecture, we directly visualized polariton-enhanced exciton transport via angle-dependent transient absorption microscopy measurements. The observed transport enhancement extends into the picosecond timescale, leading to more than 1 order of magnitude improvement of exciton migration, from ∼10 nm to 100s of nanometers. We proposed a polariton-mediated exciton transport model and obtained an average polariton velocity of ∼1 × 106m/s for states with an ∼40% photonic fraction. These results demonstrate plasmonic particle arrays as a versatile and adaptable cavity to enhance exciton transport.