Author Affiliations
Abstract
1 Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
2 School of Integrated Circuits, Beijing University of Posts and Telecommunications, Beijing 100876, China
In this Letter, we report on the investigations of nonlinear scattering of plasmonic nanoparticles by manipulating ambient environments. We create different local thermal hosts for gold nanospheres that are immersed in oil, encapsulated in silica glass and also coated with silica shells. In terms of regulable effective thermal conductivity, silica coatings are found to contribute significantly to scattering saturation. Benefitting from the enhanced thermal stability and the reduced plasmonic coupling provided by the shell-isolated nanoparticles, we achieve super-resolution imaging with a feature size of 52 nm (), and we can readily resolve pairs of nanoparticles with a gap-to-gap distance of 5 nm.
noble metal nanoparticles plasmonic scattering effective thermal conductivity super-resolution Chinese Optics Letters
2023, 21(10): 103601
采用磁控溅射方法, 在多晶硅薄膜太阳电池表面沉积了不同粒径大小的Au纳米粒子, 利用粒径大小可调控的Au纳米粒子的局域表面等离激元共振增强效应(LSPR), 对入射光中的可见光区域实现“光俘获”; 采用UVvis吸收光谱对LSPR进行了研究, 结果表明, LSPR能够有效拓展Au纳米粒子的光谱响应范围(400~800nm), 并且, 随着Au纳米粒子粒径的增大, LSPR共振吸收峰呈现出明显“红移”; 同时, 通过SERS表征, 证实LSPR能够有效增强Au纳米粒子周围的局域电磁场强度; 最后, 多晶硅太阳电池的JV特性曲线表明, 当Au纳米粒子溅射时间为50s时, 多晶硅太阳电池光电转换效率(η)最高为14.8%, 比未修饰Au纳米粒子的电池η提高了42.3%。
多晶硅薄膜太阳电池 Au纳米粒子 光俘获 局域表面等离激元共振 polycrystalline silicon thin film solar cells (PS noble metal nanoparticles lighttrapping localized surface plasmons resonance (LSPR)
1 中国科学院 长春光学精密机械与物理研究所, 吉林 长春 130033
2 哈尔滨工业大学 物理系, 黑龙江 哈尔滨 150001
理论上研究了吸附在金纳米颗粒表面的CdSe量子点的双光子荧光增强效应。在偶极近似下, 全面地考虑了金纳米颗粒的存在造成的表面等离激元共振增强效应和以金纳米颗粒作为受体的非辐射能量转移效应, 给出了金纳米颗粒对量子点双光子荧光的增强因子。通过数值模拟, 给出了将贵金属纳米颗粒更有效地用于增强双光子荧光的方法, 即将贵金属纳米颗粒的表面等离激元共振峰调至激发波长处, 尽可能地增大激发光的表面等离激元共振增强效应。上述理论分析结果很好地验证了已经报道的实验结果。
贵金属纳米颗粒 表面等离激元 双光子荧光 能量转移 noble metal nanoparticles surface plasmon two-photon-excited fluorescence energy transfer
