1. Plasmonic band-edge modulated surface-enhanced Raman scattering
- Author
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Xuejin Zhang, Kang Qin, Jun Tan, Yan-qing Lu, Stephen D. Evans, Guo-xin Cui, Lie-rong Yuan, Peng Bao, Yong-Yuan Zhu, and Qianjin Wang
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Band gap ,business.industry ,Relative standard deviation ,Surface plasmon ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surface plasmon polariton ,0104 chemical sciences ,symbols.namesake ,symbols ,Polariton ,Optoelectronics ,0210 nano-technology ,business ,Electronic band structure ,Raman scattering ,Plasmon - Abstract
The band structure of surface plasmon polaritons (SPPs) on the Ag surface in the presence of gratings and SPP-based surface-enhanced Raman scattering (SERS) are investigated theoretically and experimentally. The SPP bandgap position can be tuned by geometric parameters. The SPP band edge dominates the SERS behavior. The template stripping process is introduced to reduce SPP propagation losses, improving SERS sensitivity by ∼40. Apart from flexibility and a moderate SERS enhancement factor of the order of 105–106, the SPP band structure is highly reproducible with a relative standard deviation of 10.9%. Our results open opportunities for SPP band structures to serve as SERS substrates.
- Published
- 2017