Nie Kui-Ying, Tu Xuecou, Li Jing, Chen Xuanhu, Ren Fang-Fang, Zhang Guo-Gang, Kang Lin, Gu Shulin, Zhang Rong, Wu Peiheng, Zheng Youdou, Tan Hark Hoe, Jagadish Chennupati, Ye Jiandong
School of Electronic Science and Engineering , Nanjing University , Nanjing 210093 , China.
School of Physics and Engineering , Xingyi Normal University for Nationalities , Xingyi 562400 , China.
ACS Nano. 2018 Jul 24;12(7):7327-7334. doi: 10.1021/acsnano.8b03685. Epub 2018 Jun 14.
The ability to manipulate light-matter interaction in semiconducting nanostructures is fascinating for implementing functionalities in advanced optoelectronic devices. Here, we report the tailoring of radiative emissions in a ZnTe/ZnTe:O/ZnO core-shell single nanowire coupled with a one-dimensional aluminum bowtie antenna array. The plasmonic antenna enables changes in the excitation and emission processes, leading to an obvious enhancement of near band edge emission (2.2 eV) and subgap excitonic emission (1.7 eV) bound to intermediate band states in a ZnTe/ZnTe:O/ZnO core-shell nanowire as well as surface-enhanced Raman scattering at room temperature. The increase of emission decay rate in the nanowire/antenna system, probed by time-resolved photoluminescence spectroscopy, yields an observable enhancement of quantum efficiency induced by local surface plasmon resonance. Electromagnetic simulations agree well with the experimental observations, revealing a combined effect of enhanced electric near-field intensity and the improvement of quantum efficiency in the ZnTe/ZnTe:O/ZnO nanowire/antenna system. The capability of tailoring light-matter interaction in low-efficient emitters may provide an alternative platform for designing advanced optoelectronic and sensing devices with precisely controlled response.
在半导体纳米结构中操控光与物质相互作用的能力，对于在先进光电器件中实现各种功能而言极具吸引力。在此，我们报告了在一根ZnTe/ZnTe:O/ZnO核壳单纳米线与一维铝蝴蝶结天线阵列耦合的情况下对辐射发射的调控。等离子体天线能够改变激发和发射过程，从而在室温下显著增强ZnTe/ZnTe:O/ZnO核壳纳米线中与中间带态相关的近带边发射（2.2电子伏特）和亚带隙激子发射（1.7电子伏特），以及表面增强拉曼散射。通过时间分辨光致发光光谱探测到的纳米线/天线系统中发射衰减率的增加，产生了由局域表面等离子体共振引起的量子效率的可观测增强。电磁模拟与实验观测结果吻合良好，揭示了ZnTe/ZnTe:O/ZnO纳米线/天线系统中增强的电近场强度和量子效率提高的综合效应。在低效发光体中调控光与物质相互作用的能力，可能为设计具有精确可控响应的先进光电器件和传感设备提供一个替代平台。
