Imaging propagative exciton polaritons in atomically thin WSe 2 waveguides

作者：Fengrui Hu, Y. Luan, J. Speltz, Ding Zhong, C. H. Liu, Jiaqiang Yan, David Mandrus, Xiaodong Xu, Zhe Fei · 发表于：Physical review. B./Physical review. B · 年份：2019 · DOI：10.1103/physrevb.100.121301 · 被引用次数：42 · 研究领域：Strong Light-Matter Interactions、Plasmonic and Surface Plasmon Research、Semiconductor Quantum Structures and Devices

This work reports a nano-optical imaging study of the transverse-electric exciton polaritons in atomically thin WSe${}_{2}$ nanoflakes by using a scattering-type scanning near-field optical microscope excited by an $s$-polarized laser. These exciton polaritons demonstrate the signature back-bending polariton dispersion, a long propagation length, and a tailored polariton wavelength by controlling the thickness of WSe${}_{2}$. The discovery of long-propagating exciton polaritons in WSe${}_{2}$ atomic layers paves the way for the future development of actively tunable polaritonic devices in the near-infrared region.