Transient enhancement and spectral narrowing of the photothermal effect of plasmonic nanoparticles under pulsed excitation.
Transient enhancement and spectral narrowing of the photothermal effect of plasmonic nanoparticles under pulsed excitation.
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DOI：
10.1002/adma.201204083
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发表时间：
2013-02-06
影响因子：
29.4
通讯作者：
Lapotko, Dmitri O.
中科院分区：
文献类型：
--
作者：
Lukianova-Hleb, Ekaterina Y.;Volkov, Alexey N.;Wu, Xiangwei;Lapotko, Dmitri O.
金属等离子体纳米粒子是通过表面等离子体共振机制将光转化为热的最佳材料。[1,2]这种独特的光热（PT）特性被开发出来，允许通过工程等离子体共振在纳米尺度上精确操纵热能。[3-6]这种工程NPs的PT效能和光谱选择性的增强与几个主要限制有关。最常见的是，静止光激发产生高热损失[7-9]，这反过来又需要额外的激发能量，而脉冲激发涉及高光强度，破坏提供光吸收的NP结构。[10-13]单个NPs的吸收光谱的光谱宽度最多为几十纳米，而NPs的随机聚类进一步将其光谱扩大到数百纳米。[2,14 - 16]因此，具有高光谱分辨率和最小热损耗的高PT效率的能力将显著改善等离子体材料的当前应用。到目前为止，金属NPs的PT和光谱性质都是在合成过程中设定的[2 - 6,17]，并假设在激发过程中保持不变。与这种平稳范式不同，我们考虑了一种基于NPs的非平稳激励的替代方法。我们假设，金属NP对短激光脉冲的吸收以及诱导的NP的非平稳修饰将在狭窄的纳米宽光谱窗口中增强光学吸光度（从而提高PT的效率）。因此，我们研究了基本的和研究得很好的金属NPs，固体金球（已知的）的PT响应
Metal plasmonic NPs are the best converters of light into heat through the mechanism of surface plasmon resonance.[1, 2] This unique photothermal (PT) property was developed to allow precise manipulations of thermal energy at nanoscale through engineered plasmon resonances.[3–6] Enhancement of the PT efficacy and spectral selectivity of such engineered NPs is associated with several principal limitations. Most commonly, stationary optical excitation creates high thermal losses [7–9] that, in turn, require additional excitation energy, while the pulsed excitation involves high optical intensities that destroy NP structure that provides optical absorbance.[10–13] Spectral width of absorption spectra of single NPs is tens of nanometers at best, while random clustering of NPs further broadens their spectra to hundreds of nanometers.[2, 14–16] An ability to deliver high PT efficacy with high spectral resolution and minimal thermal losses will therefore significantly improve current applications of plasmonic materials.Until now, the PT and spectral properties of metal NPs have been set during their synthesis [2–6, 17] and have been assumed to stay constant during their excitation. Unlike this stationary paradigm we considered an alternative approach based on the non-stationary excitation of NPs. We hypothesized that the absorption of a short laser pulse by a metal NP and the induced non-stationary modification of the NP would enhance optical absorbance (and hence the PT efficacy) in the narrow, nanometer-wide, spectral window. We therefore studied the PT responses of the basic and well-studied metal NPs, solid gold spheres (known
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影响因子：
2.9
作者：
Dou, YS;Zhigilei, LV;Garrison, BJ
通讯作者：
Garrison, BJ
影响因子：
14
作者：
Lukianova-Hleb, Ekaterina Y.;Belyanin, Andrey;Kashinath, Shruti;Wu, Xiangwei;Lapotko, Dmitri O.
通讯作者：
Lapotko, Dmitri O.
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通讯作者：
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作者：
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通讯作者：
West, Jennifer L.
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10.8
作者：
Lukianova-Hleb EY;Lapotko DO
通讯作者：
Lapotko DO