title: Nonlinear optical properties of near-infrared region Ag2S quantum dots pumped by nanosecond laser pulses.
abstract: This study investigates near-infrared region Ag2S quantum dots (QDs) and their nonlinear optical response under 532 nm nanosecond laser pulses. Our experimental result shows that nonlinear transmission is reduced from 0.084 to 0.04. The observed narrowing behavior of the output pulse width shows superior optical limiting. We discuss the physical mechanisms responsible for the nonlinear optical response of the QDs. The average size of the nanocrystals was 5.5 nm. Our results suggest the possibility of using these Ag2S QDs for photoelectric, biosensor, optical ranging, and self-adaptive technologies.
authors.affiliation: School of Science, Changchun University of Science and Technology, Changchun, Jilin, 130022, China ; International Joint Research Center for Nanophotonics and Biophotonics, Changchun, Jilin, 130022, China.
authors.forename: Li-Wei
authors.initials: LW
authors.lastname: Liu
authors.affiliation: School of Science, Changchun University of Science and Technology, Changchun, Jilin, 130022, China ; International Joint Research Center for Nanophotonics and Biophotonics, Changchun, Jilin, 130022, China.
authors.forename: Si-Yi
authors.initials: SY
authors.lastname: Hu
authors.affiliation: School of Science, Changchun University of Science and Technology, Changchun, Jilin, 130022, China.
authors.forename: Yin-Ping
authors.initials: YP
authors.lastname: Dou
authors.affiliation: School of Science, Changchun University of Science and Technology, Changchun, Jilin, 130022, China.
authors.forename: Tian-Hang
authors.initials: TH
authors.lastname: Liu
authors.affiliation: School of Science, Changchun University of Science and Technology, Changchun, Jilin, 130022, China.
authors.forename: Jing-Quan
authors.initials: JQ
authors.lastname: Lin
authors.affiliation: School of Science, Changchun University of Science and Technology, Changchun, Jilin, 130022, China ; International Joint Research Center for Nanophotonics and Biophotonics, Changchun, Jilin, 130022, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
keywords: nonlinear optics; quantum dots; silver sulfide (Ag2S); strong absorption