Steering valley-polarized emission of monolayer MoS<sub>2</sub> sandwiched in plasmonic antennas

POSTER

Abstract

Monolayer transition metal dichalcogenides (TMDCs) have intrinsic spin-valley degrees of freedom, making it appealing to exploit valleytronic and optoelectronic applications at the nanoscale. Here, we demonstrate that a chiral plasmonic antenna consisting of two stacked gold nanorods (GNRs) can modulate strongly valley-polarized photoluminescence (PL) of monolayer MoS2 in a broad spectral range at room temperature. The valley-polarized PL of the MoS2 with the antenna can reach up to ~48% accompanied with more than three orders of magnitude enhancement of PL intensity. Also, the K and K’ valleys under opposite circularly polarized light excitation exhibit different emission intensities and directivities in the far-field, which can be attributed to the valley-dependent exciton modulation by the chiral antenna in both excitation and emission processes. The distinct features of the ultra-compact hybrid suggest potential applications for valleytronic and photonic devices, chiral quantum optics, and high-sensitive detection.

Presenters

  • te wen

    • School of Physics, Peking University

Authors

  • te wen

    • School of Physics, Peking University

  • Hu Aiqin

    • School of Physics, Peking University

  • Yang Chen

    • Department of Electrical and Computer Engineering, National University of Singapore

  • Cheng-wei Qiu

    • Department of Electrical and Computer Engineering, National University of Singapore

  • Qihuang Gong

    • State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-optoelectronics, Collaborative Innovation Center of Quantum Matter, School of Physics, Peking U
    • Peking Univ
    • School of Physics, Peking University

  • Guowei Lv

    • School of Physics, Peking University