Imaging and Spectroscopy of Single Metal Nanostructure Absorption
Imaging and Spectroscopy of Single Metal Nanostructure Absorption
复制标题
DOI：
10.1021/acs.langmuir.7b03154
复制
发表时间：
2018-04-03
期刊：
影响因子：
3.9
通讯作者：
Link, Stephan
中科院分区：
文献类型：
--
作者：
Joplin, Anneli;Chang, Wei-Shun;Link, Stephan
金属纳米颗粒的高度可调光学特性使其成为任何需要在纳米尺度上控制光、热或电子的应用中的理想构建块。由于它们的尺寸，金属纳米颗粒有效地吸收和散射光。因此，改善它们的性能通常涉及改变吸收和散射之间的平衡，以促进它们的光学特性的期望特征。通常使用暗场散射光谱来表征单个金属纳米颗粒的散射，但是表征宽波长范围内的纯吸收的常规方法要复杂得多。本文回顾了我们实验室使用光热成像结合暗场散射和电子显微镜分离单个纳米粒子及其组装体的辐射和非辐射性质的工作。我们提出了两个初始工作，使用不同的激光波长，探索纯吸收无散射的贡献的基础上释放到环境中的热量，以及光热光谱的发展在一个宽的波长范围内，使得有可能解决的细节，否则隐藏在合奏测量，大部分时间也不分开的辐射和非辐射特性。
The highly tunable optical properties of metal nanoparticles make them an ideal building block in any application that requires control over light, heat, or electrons on the nanoscale. Because of their size, metal nanoparticles both absorb and scatter light efficiently. Consequently, improving their performance often involves shifting the balance between absorption and scattering to promote desirable features of their optical properties. Scattering by single metal nanoparticles is commonly characterized using dark-field scattering spectroscopy, but routine methods to characterize pure absorption over a broad wavelength range are much more complex. This article reviews work from our lab using photothermal imaging in combination with dark-field scattering and electron microscopy to separate radiative and nonradiative properties of single nanoparticles and their assemblies. We present both initial work using different laser wavelengths to explore pure absorption free from scattering contributions based on the heat released into the environment as well as the development of photothermal spectroscopy over a broad wavelength range, making it possible to resolve details that are otherwise hidden in ensemble measurements that most of the time also do not separate radiative and nonradiative properties.