RT Journal Article
SR Electronic
T1 Steering valley-polarized emission of monolayer MoS<sub>2</sub> sandwiched in plasmonic antennas
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaao0019
DO 10.1126/sciadv.aao0019
VO 6
IS 21
A1 Wen, Te
A1 Zhang, Weidong
A1 Liu, Shuai
A1 Hu, Aiqin
A1 Zhao, Jingyi
A1 Ye, Yu
A1 Chen, Yang
A1 Qiu, Cheng-Wei
A1 Gong, Qihuang
A1 Lu, Guowei
YR 2020
UL http://advances.sciencemag.org/content/6/21/eaao0019.abstract
AB Monolayer transition metal dichalcogenides 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 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 using the antenna can reach up to ~47%, with approximately three orders of PL magnitude enhancement within the plasmonic nanogap. Besides, 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 modulation of the valley-dependent excitons by the chiral antenna in both the excitation and emission processes. The distinct features of the ultracompact hybrid suggest potential applications for valleytronic and photonic devices, chiral quantum optics, and high-sensitivity detection.