Single-Nanoparticle Plasmonic Electro-optic Modulator Based on MoS 2 Monolayers

作者：Bowen Li, Shuai Zu, Jiadong Zhou, Qiao Jiang, Bowen Du, Hangyong Shan, Yang Luo, Zheng Liu, Xing Zhu, Zheyu Fang · 发表于：ACS Nano · 年份：2017 · DOI：10.1021/acsnano.7b05479 · 被引用次数：113 · 研究领域：2D Materials and Applications、Plasmonic and Surface Plasmon Research、Gold and Silver Nanoparticles Synthesis and Applications

The manipulation of light in an integrated circuit is crucial for the development of high-speed electro-optic devices. Recently, molybdenum disulfide (MoS 2 ) monolayers generated broad interest for the optoelectronics because of their huge exciton binding energy, tunable optical emission, direct electronic band-gap structure, etc. Miniaturization and multifunctionality of electro-optic devices further require the manipulation of light–matter interaction at the single-nanoparticle level. The strong exciton–plasmon interaction that is generated between the MoS 2 monolayers and metallic nanostructures may be a possible solution for compact electro-optic devices at the nanoscale. Here, we demonstrate a nanoplasmonic modulator in the visible spectral region by combining the MoS 2 monolayers with a single Au nanodisk. The narrow MoS 2 excitons coupled with broad Au plasmons result in a deep Fano resonance, which can be switched on and off by applying different gate voltages on the MoS 2 monolayers. A reversible display device that is based on this single-nanoparticle modulator is demonstrated with a heptamer pattern that is actively controlled by the external gates. Our work provides a potential application for electro-optic modulation on the nanoscale and promotes the development of gate-tunable nanoplasmonic devices in the future.