Subdiffraction-Limited Plasmonic Imaging with Anisotropic Metal Nanoparticles

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• 作者：Xiaodong Cheng ; Dinggui Dai ; Dong Xu ; Yan He ; Edward S. Yeung
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：March 4, 2014
• 年：2014
• 卷：86
• 期：5
• 页码：2303-2307
• 全文大小：263K
• 年卷期：v.86,no.5(March 4, 2014)
• ISSN：1520-6882

文摘

We have developed a high-resolution nonfluorescent imaging method based on superlocalization of gold nanorods (AuNRs). By taking advantage of their anisotropic optical property of the plasmonic scattering of AuNRs, selective imaging of only a fraction of AuNRs can be achieved by rotating the sample relative to the linear polarized illumination under cross-polarization microscopy with a high NA objective. The AuNR positions obtained from a series of images could then be used to reconstruct the overall image. Two AuNRs with center-to-center distances of 80 nm were successfully resolved. This simple but deterministic super-resolution imaging technique can potentially be used to fingerprint optically anisotropic metal nanoparticles and their assemblies for labeling, sensing, and encryption applications.