Laser pulse duration is critical for the generation of plasmonic nanobubbles.

Laser pulse duration is critical for the generation of plasmonic nanobubbles.
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DOI:
10.1021/la5015362
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发表时间:
2014-07-01
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Lapotko DO
Lapotko DO
中科院分区:
其他
文献类型:
--
作者:
Lukianova-Hleb EY;Volkov AN;Lapotko DO

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等离子体纳米气泡(PNBs)是在激光过热的等离子体纳米颗粒周围的液体中产生的瞬时蒸气纳米气泡。与等离子体纳米粒子不同,由于其高度不稳定的性质,PNBs的性质在很大程度上仍不清楚。在这里,我们展示了光激发持续时间对PNB产生的能量效率和阈值的影响。皮秒脉冲激发和纳米粒子聚集的组合提供了最高的能量效率和最低的阈值通量,大约5mJ cm-2,产生PNB。相比之下,较长的激励脉冲会使PNB产生的能量效率降低几个数量级。最终,连续激发具有最小的能量效率,比皮秒激发低9个数量级。因此,与等离子体纳米颗粒的激发波长、纳米颗粒大小、形状或其他固定属性相比,等离子体纳米颗粒的光激发持续时间对PNB的产生具有更强的影响。
Plasmonic nanobubbles (PNBs) are transient vapor nanobubbles generated in liquid around laser-overheated plasmonic nanoparticles. Unlike plasmonic nanoparticles, PNBs’ properties are still largely unknown due to their highly nonstationary nature. Here we show the influence of the duration of the optical excitation on the energy efficacy and threshold of PNB generation. The combination of picosecond pulsed excitation with the nanoparticle clustering provides the highest energy efficacy and the lowest threshold fluence, around 5 mJ cm–2, of PNB generation. In contrast, long excitation pulses reduce the energy efficacy of PNB generation by several orders of magnitude. Ultimately, the continuous excitation has the minimal energy efficacy, nine orders of magnitude lower than that for the picosecond excitation. Thus, the duration of the optical excitation of plasmonic nanoparticles can have a stronger effect on the PNB generation than the excitation wavelength, nanoparticle size, shape, or other “stationary” properties of plasmonic nanoparticles.
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影响因子: 3.5
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