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Plasmon-Enhanced Fluorescence Near Single Gold Nanoplates Studied by Scanning Near-Field Two-Photon Excitation Microscopy
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-09-21 , DOI: 10.1021/acs.jpcc.1c06466 Seiju Hasegawa 1 , Keisuke Imaeda 2 , Kohei Imura 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-09-21 , DOI: 10.1021/acs.jpcc.1c06466 Seiju Hasegawa 1 , Keisuke Imaeda 2 , Kohei Imura 1
Affiliation
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Plasmonic optical fields have been applied for surface-enhanced spectroscopy, chemical sensing, and bioimaging. Spatial distributions of optical fields are critical for optimizing their functionalities. In plasmon-enhanced fluorescence, both incoming and outgoing fields excited by the plasmon should contribute to the enhancement of the fluorescence. Spatial characteristics of plasmons are critical not only for the fundamental understanding of the plasmon but also for their practical applications. Here, we investigate the spatial characteristics of the excitation and relaxation processes near the gold nanoplate using time-resolved near-field two-photon microscopy. We reveal from near-field optical microscopy that the incident field is locally enhanced by the plasmon resonance effect and the lightning rod effect. Near-field time-resolved fluorescence imaging demonstrates that the fluorescence decay is accelerated entirely over the surface of the plate regardless of the spatial distribution of the incident field. These results provide deep insight into plasmonic optical fields and are of great importance for designing plasmon-based substrates for surface-enhanced spectroscopy and photochemical reactions.
中文翻译：
通过扫描近场双光子激发显微镜研究单个金纳米片附近的等离子体增强荧光
等离子体光场已应用于表面增强光谱、化学传感和生物成像。光场的空间分布对于优化其功能至关重要。在等离子体增强荧光中，等离子体激发的传入和传出场都应有助于荧光的增强。等离子体的空间特性不仅对于等离子体的基本理解而且对于它们的实际应用都至关重要。在这里，我们使用时间分辨近场双光子显微镜研究金纳米板附近激发和弛豫过程的空间特征。我们从近场光学显微镜中发现，等离子体共振效应和避雷针效应局部增强了入射场。近场时间分辨荧光成像表明，无论入射场的空间分布如何，荧光衰减都会在板表面完全加速。这些结果提供了对等离子体光场的深入了解，对于设计用于表面增强光谱和光化学反应的基于等离子体的基底具有重要意义。
更新日期：2021-09-30
中文翻译：
通过扫描近场双光子激发显微镜研究单个金纳米片附近的等离子体增强荧光
等离子体光场已应用于表面增强光谱、化学传感和生物成像。光场的空间分布对于优化其功能至关重要。在等离子体增强荧光中，等离子体激发的传入和传出场都应有助于荧光的增强。等离子体的空间特性不仅对于等离子体的基本理解而且对于它们的实际应用都至关重要。在这里，我们使用时间分辨近场双光子显微镜研究金纳米板附近激发和弛豫过程的空间特征。我们从近场光学显微镜中发现，等离子体共振效应和避雷针效应局部增强了入射场。近场时间分辨荧光成像表明，无论入射场的空间分布如何，荧光衰减都会在板表面完全加速。这些结果提供了对等离子体光场的深入了解，对于设计用于表面增强光谱和光化学反应的基于等离子体的基底具有重要意义。
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