Lee, Hyeongwoo Koo, Yeonjeong Kumar, Shailabh Jeong, Yunjo Heo, Dong Gwon Choi, Soo Ho Joo, Huitae Kang, Mingu Siddique, Radwanul Hasan Kim, Ki Kang Lee, Hong Seok An, Sangmin Choo, Hyuck Park, Kyoung-Duck 2024-01-19T09:33:49Z 2024-01-19T09:33:49Z 2023-07-20 2023-04 2041-1723 https://pubs.kist.re.kr/handle/201004/113792 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. The authors induce a nanoscale strain gradient in monolayer MoS2 suspended on a waveguide and take advantage of propagating surface plasmon polaritons to localize hot electrons in the suspended area. They funnel excitons in the waveguide, facilitating all-optical control of exciton-to-trion conversion. English Nature Publishing Group All-optical control of high-purity trions in nanoscale waveguide Article 10.1038/s41467-023-37481-1 1 Nature Communications, v.14, no.1 Nature Communications 14 1 Y scie scopus 001003644100021 2-s2.0-85152308921 Multidisciplinary Sciences Science & Technology - Other Topics Article HOT-ELECTRON GENERATION STRAINED MONOLAYER DYNAMICS EXCITONS