Sensitive Gap-Enhanced Raman Spectroscopy with a Perfect Radially Polarized Beam
| Autor: | Xiujie Dou, Jiao Lin, Aiping Yang, Fanfei Meng, Chonglei Zhang, Xiaocong Yuan, Changjun Min, Luping Du |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
business.industry Surface plasmon Biophysics 02 engineering and technology 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Biochemistry Surface plasmon polariton Gap mode 010309 optics symbols.namesake Optics 0103 physical sciences symbols Molecule Surface plasmon resonance 0210 nano-technology business Raman spectroscopy Excitation Biotechnology |
| Zdroj: | Plasmonics. 13:991-996 |
| ISSN: | 1557-1963 1557-1955 |
| Popis: | Gap mode surface-enhanced Raman spectroscopy (SERS) enables high enhancement of Raman signal. However, the polarization of excitation light shows great influence on the excitation of gap mode and hence on the Raman enhancement. Here, we propose a nanoparticle-on-film gap mode SERS accompanying with a new type of excitation source called as perfect radially polarized (PRP) beam. The PRP beam possesses a ring-shaped beam pattern that can be tuned to match the surface plasmon resonance angle under a tight focusing condition, hence improving greatly the excitation efficiency of surface plasmon polaritons, and eventually the sensitivity of gap mode SERS. Such kind of enhanced-Raman system with a PRP beam has a great potential on the applications such as single molecule Raman detection. |
| Databáze: | OpenAIRE |
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