飞秒
等离子体子
极化子
激子
激发态
材料科学
超短脉冲
光电子学
超快激光光谱学
共振(粒子物理)
激发
激光器
光学
物理
凝聚态物理
原子物理学
量子力学
作者
Elad Eizner,Katherine Akulov,Tal Schwartz,Tal Ellenbogen
出处
期刊:Nano Letters
[American Chemical Society]
日期:2017-11-02
卷期号:17 (12): 7675-7683
被引量:20
标识
DOI:10.1021/acs.nanolett.7b03751
摘要
We use femtosecond transient absorption spectroscopy to study the temporal dynamics of strongly coupled exciton-plasmon polaritons in metasurfaces of aluminum nanoantennas coated with J-aggregate molecules. Compared with the thermal nonlinearities of aluminum nanoantennas, the exciton-plasmon hybridization introduces strong ultrafast nonlinearities in the composite metasurfaces. Within femtoseconds after the pump excitation, the plasmonic resonance is broadened and shifted, showcasing its high sensitivity to excited-state modification of the molecular surroundings. In addition, we observe temporal oscillations due to the deep subangstrom acoustic breathing modes of the nanoantennas in both bare and hybrid metasurfaces. Finally, unlike the dynamics of hybrid states in optical microcavities, here, ground-state bleaching is observed with a significantly longer relaxation time at the upper polariton band.
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