Xu Ning, Li Hongbo, Gan Yiyu, Chen Hualong, Li Wenjia, Zhang Feng, Jiang Xiantao, Shi Yihuan, Liu Jiefeng, Wen Qiao, Zhang Han
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China.
Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics Collaborative Innovation Center for Optoelectronic Science and Technology Shenzhen University Shenzhen 518060 China.
Adv Sci (Weinh). 2020 Sep 27;7(22):2002209. doi: 10.1002/advs.202002209. eCollection 2020 Nov.
In recent years, MXene has become a hotspot because of its good conductivity, strong broadband absorption, and tunable band gap. In this contribution, 0D MXene TiCT quantum dots are synthesized by a liquid exfoliation method and a wideband nonlinear optical response from 800 to 1550 nm is studied, which have a larger nonlinear absorption coefficient of -(11.24 ± 0.14) × 10 cm GW. The carrier dynamic processes of 0D MXene are explored with ultrahigh time resolution nondegenerate transient absorption (TA) spectroscopy, which indicates that the TA signal reaches its maximum in 1.28 ps. Furthermore, 0D MXene is used to generate ultrashort pulses in erbium or ytterbium-doped fiber laser cavity. High signal-to-noise (72 dB) femtosecond lasers with pulse durations as short as 170 fs with spectrum bandwidth of 14.8 nm are obtained. Finally, an ultranarrow fiber laser based on 0D MXene is also investigated and has a full width at half maximum of only 5 kHz, and the power fluctuation is less than 0.75% of the average power. The experimental works prove that 0D MXene is an excellent SA and has a promising application in ultrafast and ultranarrow photonics.
近年来，MXene因其良好的导电性、强大的宽带吸收能力和可调节的带隙而成为研究热点。在本研究中，通过液相剥离法合成了0D MXene TiCT量子点，并研究了其在800至1550 nm波段的宽带非线性光学响应，其非线性吸收系数较大，为-(11.24±0.14)×10 cm GW 。利用超高时间分辨率的非简并瞬态吸收（TA）光谱对0D MXene的载流子动力学过程进行了探究，结果表明TA信号在1.28 ps内达到最大值。此外，0D MXene被用于掺铒或掺镱光纤激光腔中产生超短脉冲。获得了脉冲持续时间短至170 fs、光谱带宽为14.8 nm、信噪比高达72 dB的高信噪比飞秒激光。最后，还研究了基于0D MXene的超窄线宽光纤激光器，其半高全宽仅为5 kHz，功率波动小于平均功率的0.75%。实验结果证明，0D MXene是一种优异的饱和吸收体，在超快和超窄线宽光子学领域具有广阔的应用前景。
