Zhou Shuang, Bian Jie, Chen Peng, Xie Mo, Chao Jie, Hu Wei, Lu Yanqing, Zhang Weihua
College of Engineering and Applied Sciences, MOE Key Laboratory of Intelligent Optical Sensing and Manipulation, Nanjing university, Nanjing, 210023, China.
State Key Laboratory of Analytical Chemistry for Life Science, and Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing University, Nanjing, 210093, China.
Light Sci Appl. 2022 Mar 18;11(1):64. doi: 10.1038/s41377-022-00755-2.
Circular dichroism spectroscopy is one of the most important tools in nanoscopic chiroptics. However, there is lack of simple, fast and reliable method for measuring the circular dichroism responses of single nanostructures. To tackle this issue, we report a polarization-dispersive imaging spectrometer which is capable of measuring the scattering circular dichroism response of a single chiral nanostructure with a single shot. Using this technique, we studied the scattering circular dichroism spectra of a model system, the vertically coupled plasmonic nanorod pair. Both experimental and theoretical results indicate that the polarization-dispersive spectrometer measures the imaginary part of nonlocal susceptibility of the structure. We further applied the technique to 3-dimensional Au nanorod structures assembled on DNA origami templates together with correlated scanning electron microscopic measurements. Rich chiroptical phenomena were unveiled at the single nanostructure level.
圆二色光谱法是纳米级手性光学中最重要的工具之一。然而，目前缺乏一种简单、快速且可靠的方法来测量单个纳米结构的圆二色响应。为了解决这个问题，我们报道了一种偏振色散成像光谱仪，它能够单次测量单个手性纳米结构的散射圆二色响应。利用这项技术，我们研究了一个模型系统——垂直耦合等离子体纳米棒对的散射圆二色光谱。实验和理论结果均表明，偏振色散光谱仪测量的是该结构非局域极化率的虚部。我们进一步将该技术应用于组装在DNA折纸模板上的三维金纳米棒结构，并进行了相关的扫描电子显微镜测量。在单个纳米结构层面揭示了丰富的手性光学现象。
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