Active control of surface plasmon resonance in MoS2-Ag hybrid nanostructures
Abstract
Molybdenum disulfide (MoS2) monolayers have attracted much attention for their novel optical properties and efficient light-matter interactions. When excited by incident laser, the optical response of MoS2 monolayers was effectively modified by elementary photo-excited excitons owing to their large exciton binding energy, which can be facilitated for the optical-controllable exciton-plasmon interactions. Inspired by this concept, we experimentally investigated active light control of surface plasmon resonance (SPR) in MoS2-Ag hybrid nanostructures. The white light spectra of SPR were gradually red-shifted by increasing laser power, which was distinctly different from the one of bare Ag nanostructure. This spectroscopic tunability can be further controlled by near-field coupling strength and polarization state of light, and selectively applied to the control of plasmonic dark mode. An analytical Lorentz model for photo-excited excitons induced modulation of MoS2 dielectric function was developed to explain the insight physics of this SPR tunability. Our study opens new possibilities to the development of all-optical controlled nanophotonic devices based on 2D materials.
Keywords
Cite
@article{arxiv.1602.04464,
title = {Active control of surface plasmon resonance in MoS2-Ag hybrid nanostructures},
author = {Shuai Zu and Bowen Li and Yongji Gong and Pulickel M. Ajayan and Zheyu Fang},
journal= {arXiv preprint arXiv:1602.04464},
year = {2016}
}
Comments
27 pages, 6 figures