Giant saturation absorption of tungsten trioxide film prepared based on the seedless layer hydrothermal method  

作　　者：马晓光 胡芳珍 陈希 王艺盟 郝晓剑 顾敏 张启明 Xiaoguang Ma;Fangzhen Hu;Xi Chen;Yimeng Wang;Xiaojian Hao;Min Gu;Qiming Zhang(Science and Technology on Electronic Test and Measurement Laboratory,North University of China,Taiyuan 030051,China;Institute of Photonic Chips,University of Shanghai for Science and Technology,Shanghai 200093,China;Centre for Artificial-Intelligence Nanophotonics,School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]Science and Technology on Electronic Test and Measurement Laboratory,North University of China,Taiyuan 030051,China [2]Institute of Photonic Chips,University of Shanghai for Science and Technology,Shanghai 200093,China [3]Centre for Artificial-Intelligence Nanophotonics,School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China

出　　处：《Chinese Physics B》2023年第3期286-290,共5页中国物理B（英文版）

基　　金：the support from the Science and Technology Commission of Shanghai Municipality Municipality(Grant No.21DZ1100500);the Shanghai Municipal Science and Technology Major Project,the Shanghai Frontiers Science Center Program(2021-2025 No.20);the National Key Research and Development Program of China(Grant No.2021YFB2802000);the National Natural Science Foundation of China(Grant No.61975123);the National Natural Science Foundation of China(Grant No.52075504);Fund for Shanxi‘1331Project'Key Subject Construction and Shanxi Doctor Innovation Project(2019).

摘　　要：Nonlinear materials have gained wide interest as saturable absorbers and pulse compression for pulsed laser applications due to their unique optical properties.This work investigates the third-order nonlinear phenomenon of tungsten trioxide(WO_(3))thin films.The giant nonlinear absorption and nonlinear refractive index of WO_(3)thin films were characterized by Z-scan method at 800 nm.We experimentally observed the giant saturable absorption(SA)and nonlinear refractive index of WO_(3)thin films prepared by the seedless layer hydrothermal method,with SA coefficient being as high as-2.59×105cm·GW^(-1).The SA coefficient is at least one order of magnitude larger than those of the conventional semiconductors.The nonlinear refractive index n_(2)of WO_(3)film has been observed for the first time in recent studies and the corresponding coefficient can be up to 1.793 cm^(2)·GW^(-1).The large third-order nonlinear optical(NLO)response enables WO_(3)thin films to be promising candidates for optoelectronic and photonic applications in the near-infrared domain.

关 键 词：tungsten trioxide Z-SCAN saturable absorption 

分 类 号：TQ136.13[化学工程—无机化工] TB383.2[一般工业技术—材料科学与工程]