Huang K, Pan W, Zhu J F, Li J C, Gao N, Liu C, Ji L, Yu E T, Kang J Y
Fujian Provincial Key Laboratory of Semiconductors and Applications, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Department of Physics, Xiamen University, Xiamen 361005, P. R. China.
Department of Chemistry, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China.
Sci Rep. 2015 Dec 18;5:18331. doi: 10.1038/srep18331.
Asymmetric light reflectance associated with localized surface plasmons excited in metal nanoparticles on a quartz substrate is observed and analyzed. This phenomenon is explained by the superposition of two waves, the wave reflected by the air/quartz interface and that reflected by the metal nanoparticles, and the resulting interference effects. Far field behavior investigation suggests that zero reflection can be achieved by optimizing the density of metal nanoparticles. Near field behavior investigation suggests that the coupling efficiency of localized surface plasmon can be additionally enhanced by separating the metal NPs from substrates using a thin film with refractive index smaller than the substrate. The latter behavior is confirmed via surface-enhanced Raman spectroscopy studies using metal nanoparticles on Si/SiO2 substrates.
观察并分析了与石英衬底上金属纳米颗粒中激发的局域表面等离子体相关的不对称光反射率。这种现象是由空气/石英界面反射的波和金属纳米颗粒反射的波这两列波的叠加以及由此产生的干涉效应来解释的。远场行为研究表明，通过优化金属纳米颗粒的密度可以实现零反射。近场行为研究表明，使用折射率小于衬底的薄膜将金属纳米颗粒与衬底分离，可以额外提高局域表面等离子体的耦合效率。后一种行为通过在Si/SiO2衬底上使用金属纳米颗粒的表面增强拉曼光谱研究得到了证实。
