Resolving plasmonic hotspots by label-free super-resolution microscopy

Xue Cheng; Congyue Liu; Guorui Zhang; Wei Liu; Ju Wang; Yiqun Duan; Jianjun Chen; Jianjun Chen; Jianjun Chen; Jianjun Chen; Jianjun Chen; Hong Yang; Hong Yang; Hong Yang; Hong Yang; Shufeng Wang; Shufeng Wang; Shufeng Wang; Shufeng Wang; Shufeng Wang

doi:10.1364/OL.443571

Optics Letters
Vol. 47,
Issue 2,
pp. 210-213
(2022)
•https://doi.org/10.1364/OL.443571

Resolving plasmonic hotspots by label-free super-resolution microscopy

Xue Cheng, Congyue Liu, Guorui Zhang, Wei Liu, Ju Wang, Yiqun Duan, Jianjun Chen, Hong Yang, and Shufeng Wang

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Xue Cheng, Congyue Liu, Guorui Zhang, Wei Liu, Ju Wang, Yiqun Duan, Jianjun Chen, Hong Yang, and Shufeng Wang, "Resolving plasmonic hotspots by label-free super-resolution microscopy," Opt. Lett. 47, 210-213 (2022)

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- Microscopy
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About this Article
History
- Original Manuscript: September 20, 2021
- Revised Manuscript: November 17, 2021
- Manuscript Accepted: November 23, 2021
- Published: January 3, 2022

Abstract

The plasmonic hotspot of metal nanostructures has small dimension far beyond the optical diffraction limit. When trying to locate the hotspot using fluorescent probes, the localization is significantly distorted due to the coupling of emission and surface plasmon. A label-free technique can solve the problem, which uses hotspot emission as the native probe. We demonstrate a super-resolution microscopy investigation based on this idea. By modulating hotspot emission of crossed silver nanowires, which have a pair of plasmonic hotspots approximately 100 nm apart at the intersection, we precisely locate and separate them with nanometer precision. This label-free technique could be applied for analyzing hotspot distribution with high efficiency and precision.

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