Sivan Aswathi K, Di Mario Lorenzo, Catone Daniele, O'Keeffe Patrick, Turchini Stefano, Rubini Silvia, Martelli Faustino
Istituto per la Microelettronica e i Microsistemi (IMM), Consiglio Nazionale delle Ricerche, Via del Fosso del Cavaliere, 100, 00133 Rome, Italy.
Nanotechnology. 2020 Apr 24;31(17):174001. doi: 10.1088/1361-6528/ab68ba. Epub 2020 Jan 7.
In this work we show how the optical properties of ZnSe nanowires are modified by the presence of Ag nanoparticles on the sidewalls of the ZnSe nanowires. In particular, we show that the low-temperature luminescence of the ZnSe nanowires changes its shape, enhancing the phonon replicas of impurity-related recombination and affecting rise and decay times of the transient absorption bleaching at room temperatures, with an increase of the former and a decrease of the latter. In contrast, the deposition of Au nanoparticles on ZnSe nanowires does not change the optical properties of the sample. We suggest that the mechanism underlying these experimental observations is energy transfer via a resonant interaction, based on the fact that the localized surface plasmon resonance (LSPR) of Ag nanoparticles spectrally overlaps with absorption and emission of ZnSe, while the Au LSPR does not.
在这项工作中，我们展示了在ZnSe纳米线侧壁上存在Ag纳米颗粒时，ZnSe纳米线的光学性质是如何被改变的。特别地，我们表明ZnSe纳米线的低温发光改变了其形状，增强了杂质相关复合的声子复制品，并影响了室温下瞬态吸收漂白的上升和衰减时间，前者增加而后者减少。相比之下，在ZnSe纳米线上沉积Au纳米颗粒不会改变样品的光学性质。我们认为，基于Ag纳米颗粒的局域表面等离子体共振（LSPR）在光谱上与ZnSe的吸收和发射重叠，而Au的LSPR则不然这一事实，这些实验观察结果背后的机制是通过共振相互作用进行的能量转移。
