title: Visible light nonlinear absorption and optical limiting of ultrathin ZrSe3nanoflakes.
abstract: The nonlinear absorption and nonlinear refractive properties of ZrSe3nanoflakes were studied with a 6.5 ns pulse laser at 532 nm. Open-aperture Z-scan curves reveal that ZrSe3nanoflakes have a strong reverse saturable absorption property, and close-aperture Z-scan curves show that ZrSe3dispersions possess a positive nonlinear refractive index caused by self-focusing. The nonlinear absorption coefficient, the nonlinear refraction coefficient, and the figures of merit (FOM) of ZrSe3dispersed in water with linear transmittances of 0.86 at input energy of 18 μJ are 6.35 × 10-10m W-115.73 × 10-17m2W-1, and 10.09 × 10-11esu · cm respectively. In addition, nonlinear optical (NLO) performance of ZrSe3nanoflakes depends on organic solvent dispersions. ZrSe3nanoflakes in water dispersions have the largest FOM of 10.27 × 10-11esu · cm, while the FOM in ethanol dispersions is 5.41 × 10-11esu · cm at the same input energy of 26.5 μJ. The optical limiting threshold Fthof ZrSe3nanosheet is 2.2 J cm-2under picosecond laser pulse. The Results imply that ZrSe3nanoflakes are an extraordinarily promising material for novel nanophotonic devices like optical limiters.
authors.affiliation: Key Laboratory of Mesoscopic Chemistry of MOE, and State Key Laboratory of Coordination Chemistry, and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Jia-Jing
authors.initials: JJ
authors.lastname: Wu
authors.forename: You-Rong
authors.initials: YR
authors.lastname: Tao
authors.forename: Lei
authors.initials: L
authors.lastname: Fan
authors.forename: Zhong-Yu
authors.initials: ZY
authors.lastname: Wu
authors.forename: Xing-Cai
authors.initials: XC
authors.lastname: Wu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Chun