Lukianova-Hleb Ekaterina Y, Volkov Alexey N, Lapotko Dmitri O
Departments of Biochemistry and Cell Biology and §Department of Physics and Astronomy, Rice University , 6100 Main Street, MS-140, Houston, Texas 77005, United States.
Langmuir. 2014 Jul 1;30(25):7425-34. doi: 10.1021/la5015362. Epub 2014 Jun 20.
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.
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态蒸汽纳米气泡。与等离子体纳米颗粒不同，由于其高度非稳态的性质，PNBs的性质在很大程度上仍然未知。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。皮秒脉冲激发与纳米颗粒聚集的结合提供了最高的能量效率和最低的阈值通量，约为5 mJ cm(-2)，用于产生PNB。相比之下，长激发脉冲会使PNB产生的能量效率降低几个数量级。最终，连续激发的能量效率最低，比皮秒激发低九个数量级。因此，等离子体纳米颗粒的光激发持续时间对PNB产生的影响可能比激发波长、纳米颗粒尺寸、形状或等离子体纳米颗粒的其他“静态”性质更强。
