Local spectroscopic imaging of a single quantum dot in photoinduced force microscopy
Local spectroscopic imaging of a single quantum dot in photoinduced force microscopy
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DOI：
10.1063/5.0088634
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发表时间：
2022-04
影响因子：
4
通讯作者：
J. Yamanishi;Hidemasa Yamane;Y. Naitoh;Y. Li;Y. Sugawara
中科院分区：
文献类型：
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作者：
J. Yamanishi;Hidemasa Yamane;Y. Naitoh;Y. Li;Y. Sugawara
环境敏感材料的分析对于开发和优化纳米结构光化学材料和器件至关重要。光诱导力显微镜（Photoinduced force microscopy，PiFM）是一种很有前途的局部光谱技术，它通过测量扫描针尖与样品之间的光学力来观察纳米尺度的局部光学响应。在这项研究中，我们研究了孤立的单量子点（QD）的配体在金衬底上通过超高真空下的PiFM来表征QD的吸附状态的基础上的光学力。激光诱导的强自洽光学相互作用通过尖端-衬底等离子体激元间隙调制PiFM图像取决于差距中QD晶体的存在。这一观察澄清了衬底上的QD吸收情况，并且即使配体壁覆盖晶体，也确定了QD中的晶体位置。这种关于力谱的见解可以帮助进一步研究纳米结构材料的光化学和分子光谱学。
Analysis of environmentally sensitive materials is essential for developing and optimizing nanostructured photochemical materials and devices. Photoinduced force microscopy (PiFM) is a promising local spectroscopic technique to visualize nanoscale local optical responses by measuring the optical forces between the scanning tip and sample. In this study, we examined isolated single quantum dots (QDs) with ligands on a gold substrate via PiFM under ultra-high vacuum to characterize the QD adsorption state on the basis of the optical force. The strong self-consistent optical interaction through the tip-substrate plasmonic gap induced by laser light modulates the PiFM image depending on QD crystal existence in the gap. This observation clarified the QD absorption situation on the substrate, and the crystal position in the QDs was determined even though the ligand walls covered the crystal. This insight concerning force spectroscopy can aid further research on the photochemistry of nanostructured materials and molecular spectroscopy.