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Enhanced upconversion based on the ultrahigh local field enhancement in a multilayered UCNPs-metamaterial composite system
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.jallcom.2017.11.147
Shiping Zhan , Xiaofeng Wu , Chao Tan , Jian Xiong , Shigang Hu , Junshan Hu , Shaobing Wu , Yongyi Gao , Yunxin Liu

Abstract In this paper, we reported a multilayer metamaterial system with ultrahigh absorption, consisting of silver nanoring, upconversion nanoparticles(UCNPs) and silver film, which can dramatically enhance the upconversion emission. A simplified theoretical expression of the upconversion enhancement factor(EFupc) was derived, and the structure parameter and the local field-UCNPs coupling were considered for the EFupc analysis. It was found that the bottom silver film was crucial for the tremendous upconversion enhancement since it gave rise to a pronounced absorption peak and resulted in a strong field confinement of the 980 nm excitation light. Comparing with the nanodisk, the nanoring performed better in enhancing the upconversion, and an enhancement factor of ∼3.2 × 104 was achieved based on the numerical and theoretical analysis. This metamaterial system provided a novel approach in enhancing upconversion, and the research findings could be helpful to the design of biosensor and photovoltaic devices.

中文翻译:

基于超高局域增强的多层UCNPs-超材料复合系统中的增强上转换

摘要 在本文中,我们报道了一种具有超高吸收率的多层超材料系统,由银纳米环、上转换纳米粒子(UCNPs)和银膜组成,可以显着增强上转换发射。推导了上转换增强因子(EFupc)的简化理论表达式,并在EFupc分析中考虑了结构参数和局域-UCNPs耦合。发现底部银膜对于巨大的上转换增强至关重要,因为它产生了明显的吸收峰并导致 980 nm 激发光的强场限制。与纳米盘相比,纳米环在增强上转换方面表现更好,基于数值和理论分析实现了~3.2×104的增强因子。
更新日期:2018-02-01
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