All-optical control of high-purity trions in nanoscale waveguide

Hyeongwoo Lee, Yeonjeong Koo, Shailabh Kumar, Yunjo Jeong, Dong Gwon Heo, Soo Ho Choi, Huitae Joo, Mingu Kang, Radwanul Hasan Siddique, Ki Kang Kim, Hong Seok Lee (), Sangmin An, Hyuck Choo () and Kyoung-Duck Park ()
Additional contact information
Hyeongwoo Lee: Pohang University of Science and Technology (POSTECH)
Yeonjeong Koo: Pohang University of Science and Technology (POSTECH)
Shailabh Kumar: California Institute of Technology (Caltech)
Yunjo Jeong: Korea Institute of Science and Technology
Dong Gwon Heo: Research Institute of Physics and Chemistry, Jeonbuk National University
Soo Ho Choi: Institute for Basic Science (IBS)
Huitae Joo: Pohang University of Science and Technology (POSTECH)
Mingu Kang: Pohang University of Science and Technology (POSTECH)
Radwanul Hasan Siddique: California Institute of Technology (Caltech)
Ki Kang Kim: Institute for Basic Science (IBS)
Hong Seok Lee: Research Institute of Physics and Chemistry, Jeonbuk National University
Sangmin An: Research Institute of Physics and Chemistry, Jeonbuk National University
Hyuck Choo: California Institute of Technology (Caltech)
Kyoung-Duck Park: Pohang University of Science and Technology (POSTECH)

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract The generation of high-purity localized trions, dynamic exciton–trion interconversion, and their spatial modulation in two-dimensional (2D) semiconductors are building blocks for the realization of trion-based optoelectronic devices. Here, we present a method for the all-optical control of the exciton-to-trion conversion process and its spatial distributions in a MoS2 monolayer. We induce a nanoscale strain gradient in a 2D crystal transferred on a lateral metal–insulator–metal (MIM) waveguide and exploit propagating surface plasmon polaritons (SPPs) to localize hot electrons. These significantly increase the electrons and efficiently funnel excitons in the lateral MIM waveguide, facilitating complete exciton-to-trion conversion even at ambient conditions. Additionally, we modulate the SPP mode using adaptive wavefront shaping, enabling all-optical control of the exciton-to-trion conversion rate and trion distribution in a reversible manner. Our work provides a platform for harnessing excitonic quasiparticles efficiently in the form of trions at ambient conditions, enabling high-efficiency photoconversion.

Date: 2023
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DOI: 10.1038/s41467-023-37481-1

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