Broadband Nonlinear Photonics in Few-Layer MXene Ti3C2Tx (T = F, O, or OH)
Broadband Nonlinear Photonics in Few-Layer MXene Ti3C2Tx (T = F, O, or OH)
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少层 MXene Ti3C2TX 中的宽带非线性光子学（T = F、O 或 OH）
DOI：
10.1002/lpor.201700229
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发表时间：
2018-02-01
影响因子：
11
通讯作者：
Zhang, Han
中科院分区：
文献类型：
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作者：
Jiang, Xiantao;Liu, Shunxiang;Zhang, Han
二维晶体材料中描述光-物质相互作用的非线性光学现象的研究促进了光子技术的广泛应用。MXene作为一种最近发展起来的新型2D材料，由于其类似石墨烯但高度可调和可定制的电子/光学性质而引起了人们的极大关注。在这项研究中，我们系统地表征了Mxene Ti3C2Tx纳米薄片在800 nm到1800 nm的光谱范围内的非线性光学响应。由于可饱和吸收，在所有测试波长都观察到了很大的有效非线性吸收系数(β(Ef)，接近于-10(-21)m(2)/V-2)。饱和吸收的贡献比其他有耗的非线性吸收过程高两个数量级，并且β(Ef)的幅度强烈地依赖于光漂白水平。首次发现了负的非线性折射率(n(2)接近于-10(-20)m(2)/W)，其数值与正在研究的石墨烯的数值相当。这些结果证明了Ti3C2Tx高效的宽带光信号处理能力，它只是大型MXene家族的一个成员。利用Ti3C2Tx分别作为1066 nm和1555 nm锁模的可饱和吸收材料，有力地证实了一种高效的宽带光开关的能力。在通信窗口中，可以很容易地获得脉冲宽度为159ps的高稳定飞秒激光。考虑到MXene家族的多样性，这项研究可能会为先进的光子器件开辟一条新的途径。
Studies of the nonlinear optical phenomena that describe the light-matter interactions in 2D crystalline materials have promoted a diverse range of photonic applications. MXene, as a recently developed new 2D material, has attracted considerable attention because of its graphene-like but highly tunable and tailorable electronic/optical properties. In this study, we systematically characterize the nonlinear optical response of MXene Ti3C2Tx nanosheets over the spectral range of 800 nm to 1800 nm. A large effective nonlinear absorption coefficient (beta(eff) similar to -10(-21) m(2)/V-2) due to saturable absorption is observed for all of the testing wavelengths. The contribution of saturable absorption is two orders of magnitude higher than other lossy nonlinear absorption processes, and the amplitude of beta(eff) strongly depends on the light bleaching level. A negative nonlinear refractive index (n(2) similar to -10(-20) m(2)/W) with value comparable to that of the intensively studied graphene was demonstrated for the first time. These results demonstrate the efficient broadband light signal manipulating capabilities of Ti3C2Tx, which is only one member of the large MXene family. The capability of an efficient broadband optical switch is strongly confirmed using Ti3C2Tx as saturable absorbers for mode-locking operation at 1066 nm and 1555 nm, respectively. A highly stable femtosecond laser with pulse duration as short as 159 fs in the telecommunication window is readily obtained. Considering the diversity of the MXene family, this study may open a new avenue to advanced photonic devices.