Plexciton for surface enhanced Raman scattering and emission
Plexciton for surface enhanced Raman scattering and emission
复制标题
用于表面增强拉曼散射和发射的 Plexciton
DOI：
10.1002/jrs.5806
复制
发表时间：
2019-12-02
影响因子：
2.5
通讯作者：
Sun, Mengtao
中科院分区：
文献类型：
--
作者：
Feng, Yanting;Gao, Man;Sun, Mengtao
丛激子是由相干耦合的等离子体激元和激子产生的极化激元模式。采用时域有限差分法对二氧化硅包覆银衬底上的银/半导体核壳纳米粒子的远场和近场特性进行了理论研究。计算结果表明，二氧化钛（TiO 2）是一种较好的涂层材料，可用于设计高灵敏度的表面增强拉曼散射（Sers）基底。在633 nm激光激发下，计算得到的拉曼增强因子可达4.0 × 10 ~（10）。表面等离子体激元耦合发射的Sers揭示了一个最佳的收集角为5度，这表明了一个巨大的后向散射的研究系统。理论分析结果可为设计高效的半导体Sers基底提供参考。
Plexcitons are polaritonic modes that result from coherently coupled plasmons and excitons. Far- and near-field properties of Ag/semiconductor core-shell nanoparticles on silica-coated silver substrate were theoretically studied, using finite-difference time-domain method. Our calculations suggested that titanium dioxide (TiO2) would be a better coating material, useful for the design of high-sensitive surface enhanced Raman scattering (SERS) substrate. The calculated Raman enhancement factor could be turned to as high as 4.0 x 10(10) under the 633-nm laser excitation. Surface plasmon-coupled emission of SERS reveals an optimal collection angle of 5 degrees, which shows a huge back scattering of the studied system. Our theoretical results could be used as a reference for the experimental design of semiconductor-based SERS substrate with high efficiency.