Dynamic plasmonic nano-traps for single molecule surface-enhanced Raman scattering
| Autor: | Siwei Zhu, Changjun Min, Jun Liu, Xiujie Dou, Junfeng Shen, Yuquan Zhang, Zhenwei Xie, Xiaocong Yuan, Ting Lei |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Surface plasmon Physics::Optics Nanoparticle Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences symbols.namesake Electric field Tweezers Nano symbols General Materials Science 0210 nano-technology Raman spectroscopy Plasmon Raman scattering |
| Zdroj: | Nanoscale. 9(30) |
| ISSN: | 2040-3372 |
| Popis: | Intense electric fields at the nanoscale are essential for single molecule surface-enhanced Raman scattering (SERS) detection. Such fields can be achieved in plasmonic nano-gaps between nanoparticles and metal films through hybridization of surface plasmons. The nano-gaps could be formed and dynamically controlled by using plasmonic tweezers; however, the aggregation of particles in the plasmonic field degrades each particle's enhancement and spoils the nanosized-spatial resolution. Here, dual-plasmonic tweezers are proposed and demonstrated to accurately control the number of nano-gaps and enhancement by tailoring a crater-shaped potential well in the nano-trap system. As the electric field in the nano-gap is intense, SERS spectral signatures of a single molecular level are probed simultaneously. These advantages point towards the implementation of enhanced Raman spectra, and broad applications in optical molecular detection. |
| Databáze: | OpenAIRE |
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