Polarization-Sensitive Super-Resolution Phononic Reconstruction of Nanostructures.

Polarization-Sensitive Super-Resolution Phononic Reconstruction of Nanostructures.
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纳米结构的极化敏感超分辨率声子重建。

DOI:
10.1021/acsphotonics.1c01607
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发表时间:
2022-06-15
期刊:
影响因子:
7
通讯作者:
Clark, Matt
Clark, Matt
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Fuentes-Dominguez, Rafael;Naznin, Shakila;La Cavera, Salvatore, III;Cousins, Richard;Perez-Cota, Fernando;Smith, Richard J.;Clark, Matt

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本文通过克服光学系统的衍射极限(1 μm),首次展示了在液体环境中对多个纳米结构进行偏振敏感的超分辨声子重构。利用时间分辨泵浦-探测光谱技术,我们测量了纳米球和纳米棒在不同偏振下的声学特征。这使得多个纳米颗粒的尺寸,位置和取向表征在一个单点扩散函数,精度分别为5 nm,3 nm和1.4°。与需要高真空环境进行成像的电子显微镜不同,该技术在环境压力下的液体中进行测量,非常适合研究活体标本的洞察力。这是一个潜在的超分辨率声子成像的路径,其中多个纳米结构的声学签名可以作为荧光标记的替代品。在这种情况下,声子也提供了机会,以提取有关周围介质的机械性能的信息,以及访问地下功能。
In this paper, we show for the first time the polarization-sensitive super-resolution phononic reconstruction of multiple nanostructures in a liquid environment by overcoming the diffraction limit of the optical system (1 μm). By using time-resolved pump–probe spectroscopy, we measure the acoustic signature of nanospheres and nanorods at different polarizations. This enables the size, position, and orientation characterization of multiple nanoparticles in a single point spread function with the precision of 5 nm, 3 nm, and 1.4°, respectively. Unlike electron microscopy where a high vacuum environment is needed for imaging, this technique performs measurements in liquids at ambient pressure, ideal to study the insights of living specimens. This is a potential path toward super-resolution phononic imaging where the acoustic signatures of multiple nanostructures could act as an alternative to fluorescent labels. In this context, phonons also offer the opportunity to extract information about the mechanical properties of the surrounding medium as well as access to subsurface features.
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