Characterization of ultrafast plasmon dynamics in individual gold bowtie by time-resolved photoemission electron microscopy

Characterization of ultrafast plasmon dynamics in individual gold bowtie by time-resolved photoemission electron microscopy
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通过时间分辨光电子显微镜表征单个金领结中的超快等离子体动力学

DOI:
10.1007/s00340-018-7112-9
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发表时间:
2018-12
期刊:
Applied Physics B: Lasers and Optics
影响因子:
--
通讯作者:
林景全
林景全
中科院分区:
其他
文献类型:
--
作者:
秦榆禄;季博宇;宋晓伟;林景全

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我们报告的超快动力学的等离子体场在个人的金领结纳米结构相结合的干涉时间分辨光电子显微镜与阻尼谐振子模型的调查。我们实验获得不同的等离子体激元退相时间的蝴蝶结纳米结构的尖端。同时,我们证明了实验的时间分辨光电子能谱信号可以用来直接比较不同热点的共振频率和退相时间。此外,我们还发现从光电子发射信号中提取的等离子体激元场,最初以激光场的频率振荡,由于等离子体激元的强迫振荡和自发振荡之间的竞争,在经历了几个周期的频率起伏后,最终发展到其本征频率。
We report on the investigation of ultrafast dynamics of the plasmonic field in individual gold bowtie nanostructure by combining interferometric time-resolved photoemission electron microscopy with a damped harmonic oscillator model. We experimentally obtain different plasmon dephasing times in the tips of the bowtie nanostructure. In the meantime, we demonstrate that the experimental time-resolved photoemission signal can be used to directly compare resonance frequency and dephasing time of different hot spots. In addition, we find that the plasmon field, which is extracted from the photoemission signal, initially oscillates at the laser field frequency, and finally develops into its eigenfrequency after experiencing a few periods of frequency fluctuation due to the competition between forced and autonomous oscillation of the plasmons.
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