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Characterising the size and shape of metallic nano-structures by their acoustic vibrations.
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-24 , DOI: 10.1039/d0nr03410j
Rafael Fuentes-Domínguez 1 , Shakila Naznin , Leonel Marques , Fernando Pérez-Cota , Richard J Smith , Matt Clark
Affiliation  

The characterisation of metallic nano-structures is of great importance as their optical properties are strongly dependent on their size and shape. Inaccurate size or shape characterisation can result in misleading measurements in applications such as bio-imaging and sensing. Characterisation techniques such as dynamic light scattering, electron microscopy or atomic force microscopy are commonly used; however, performing sub-surface measurements (inside semi-transparent objects) or in liquid media are very challenging. Here, we use time-resolved pump–probe spectroscopy to characterise the size and shape of metallic nano-structures in a water surrounding medium by using their vibrational modes. We show that this technique can achieve size measurements with a precision of 3 nm for the largest nano-structures which are in agreement with electron microscopy images. Furthermore, we demonstrate the ability to probe individual nano-structures despite being located in the same optical point spread function (PSF). Combining the high precision and sub-optical measurements provided by this technique with the ability to insert metallic nano-structures inside biological samples might open a way to perform 3D characterisation measurements.

中文翻译:

通过声振动表征金属纳米结构的尺寸和形状。

金属纳米结构的表征非常重要,因为它们的光学性能很大程度上取决于其尺寸和形状。不正确的尺寸或形状表征会导致在生物成像和传感等应用中产生误导性的测量结果。通常使用诸如动态光散射,电子显微镜或原子力显微镜之类的表征技术。然而,进行地下测量(在半透明物体内部)或在液体介质中进行测量是非常困难的。在这里,我们使用时间分辨泵浦探针光谱法,通过其振动模式来表征水周围介质中金属纳米结构的尺寸和形状。我们表明,对于与电子显微镜图像相符的最大纳米结构,该技术可以实现3 nm精度的尺寸测量。此外,我们展示了探测单个纳米结构的能力,尽管它们位于相同的光学点扩散函数(PSF)中。结合此技术提供的高精度和亚光学测量以及将金属纳米结构插入生物样品内部的能力,可能会开辟一种执行3D表征测量的方式。
更新日期:2020-07-09
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