Ultrafast time-resolved measurement of energy transport at the metal-liquid interface
Ultrafast time-resolved measurement of energy transport at the metal-liquid interface
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DOI：
10.1063/1.5031875
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发表时间：
2018-06
影响因子：
4
通讯作者：
Chen-Chen-Chen;Iyer Vasudevan;Zhidong Du;Xianfan Xu;Liang Pan
中科院分区：
文献类型：
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作者：
Chen-Chen-Chen;Iyer Vasudevan;Zhidong Du;Xianfan Xu;Liang Pan
金属界面上的纳米级光与物质相互作用具有许多重要的应用，特别是当提高表面积与体积比和实现高空间能量限制至关重要时。在这里，我们报告了一种超快时间分辨测量，用于研究胶体金纳米颗粒（AuNP）金属-液体界面处的光激发传输。通过使用瞬态吸收光谱方法和荧光分子的受激发射损耗，我们同时测量了纳米级距离内界面两侧能态的扰动。我们的测量结果显示了 AuNP 与其周围溶剂分子在皮秒时间尺度上超快耦合的证据。该方法可以扩展到研究生物、化学或光电子学各种界面处的能量传递机制。金属界面处的纳米级光与物质相互作用具有许多重要的应用，特别是当提高表面积与体积比和实现高空间能量限制至关重要时。在这里，我们报告了一种超快时间分辨测量，用于研究胶体金纳米颗粒（AuNP）金属-液体界面处的光激发传输。通过使用瞬态吸收光谱方法和荧光分子的受激发射损耗，我们同时测量了纳米级距离内界面两侧能态的扰动。我们的测量结果显示了 AuNP 与其周围溶剂分子在皮秒时间尺度上超快耦合的证据。该方法可以扩展到研究生物学、化学或光电子学各种界面的能量转移机制。
The nanoscale light-matter interaction at metallic interfaces has many important applications, especially when it is crucial to enhance the surface-to-volume ratio and to achieve high spatial energy confinement. Here, we report an ultrafast time-resolved measurement to study photo-excited transport at the metal-liquid interfaces of colloidal gold nanoparticles (AuNPs). By using the transient absorption spectroscopy method together with the stimulated emission depletion of fluorescence molecules, we simultaneously measured the perturbations of energy states on both sides of the interfaces within a nanoscale distance. Our measurement results showed the evidence of ultrafast coupling between AuNPs and their surrounding solvent molecules at the picosecond time scale. This method can be extended to study the energy transfer mechanisms at the various interfaces for biology, chemistry, or optoelectronics.The nanoscale light-matter interaction at metallic interfaces has many important applications, especially when it is crucial to enhance the surface-to-volume ratio and to achieve high spatial energy confinement. Here, we report an ultrafast time-resolved measurement to study photo-excited transport at the metal-liquid interfaces of colloidal gold nanoparticles (AuNPs). By using the transient absorption spectroscopy method together with the stimulated emission depletion of fluorescence molecules, we simultaneously measured the perturbations of energy states on both sides of the interfaces within a nanoscale distance. Our measurement results showed the evidence of ultrafast coupling between AuNPs and their surrounding solvent molecules at the picosecond time scale. This method can be extended to study the energy transfer mechanisms at the various interfaces for biology, chemistry, or optoelectronics.