Ultrafast saturable absorption in TiS2 induced by non-equilibrium electrons and the generation of a femtosecond mode-locked laser

被引：51

作者：

Tian, Xiangling ^{[1
,2
]}

Wei, Rongfei ^{[3
]}

Liu, Meng ^{[4
]}

Zhu, Chunhui ^{[5
]}

Luo, Zhichao ^{[4
]}

Wang, Fengqiu ^{[5
]}

Qiu, Jianrong ^{[1
,2
,6
]}

机构：

[1] South China Univ Technol, State Key Lab Luminescent Mat & Devices, Wushan Rd 381, Guangzhou 510641, Guangdong, Peoples R China

[2] South China Univ Technol, Sch Mat Sci & Engn, Wushan Rd 381, Guangzhou 510641, Guangdong, Peoples R China

[3] Zhejiang Normal Univ, Dept Phys, Jinhua 321004, Zhejiang, Peoples R China

[4] South China Normal Univ, Sch Informat & Optoelect Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China

[5] Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China

[6] Zhejiang Univ, Coll Mat Sci & Engn, State Key Lab Modern Opt Instrumentat, Hangzhou 310027, Zhejiang, Peoples R China

来源：

NANOSCALE | 2018年 / 10卷 / 20期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

INDIUM TIN OXIDE; NONLINEAR ABSORPTION; OPTICAL-PROPERTIES; MOS2; INTERCALATION; DYNAMICS; DEPENDENCE; TRANSPORT; GRAPHENE;

D O I：

10.1039/c8nr01573b

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Non-equilibrium electrons induced by ultrafast laser excitation in a correlated electron material can disturb the Fermi energy as well as optical nonlinearity. Here, non-equilibrium electrons translate a semiconductor TiS2 material into a plasma to generate broad band nonlinear optical saturable absorption with a sub-picosecond recovery time of similar to 768 fs (corresponding to modulation frequencies over 1.3 THz) and a modulation response up to similar to 145%. Based on this optical nonlinear modulator, a stable femtosecond mode-locked pulse with a pulse duration of similar to 402 fs and a pulse train with a period of similar to 175.5 ns is observed in the all-optical system. The findings indicate that non-equilibrium electrons can promote a TiS2-based saturable absorber to be an ultrafast switch for a femtosecond pulse output.

引用

页码：9608 / 9615

页数：8

共 56 条

[1] Large optical nonlinearity of indium tin oxide in its epsilon-near-zero region [J].