Investigation on the nonlinear optical properties of V2C MXene at 1.9 μm
Investigation on the nonlinear optical properties of V2C MXene at 1.9 μm
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DOI：
10.1039/d1tc03610f
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发表时间：
2021-10-05
影响因子：
6.4
通讯作者：
Lee, Ju Han
中科院分区：
文献类型：
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作者：
Lee, Jinho;Kwon, Suh-Young;Lee, Ju Han
二维（2-D）过渡金属碳化物，简称MXenes，在生物传感器、生物医学、能量转换、电催化、环境传感、非线性光学和光子学等各种应用领域引起了广泛关注。这项研究从理论上和实验上检验了钒基 MXene V2C 在 1.9 μm 波长下的非线性光学特性。首先，利用密度泛函理论（DFT）计算来计算能带结构和相应的光学参数（折射率和吸收系数的实部和虚部），以确定材料势。其次，使用开孔 (OA) 和闭孔 (CA) Z 扫描技术系统地研究了 V2C MXene 的非线性光学吸收特性和折射率。通过Z扫描测量，可以获得1.9μm光谱区的非线性光学参数，包括非线性吸收系数(β)和非线性折射率(n(2))。测得的β和n(2)分别类似于-29.67 x 10(4) cm GW(-1)和-0.61 cm(2) GW(-1)。最后，通过制造全纤维化可饱和吸收器并将其插入 Tm-Ho 光纤腔中，测试了 V2C 纳米片作为超快锁模器基础材料的飞秒锁模能力。在 1900 nm 处生成时间宽度类似于 843 fs 的稳定锁模脉冲。
Two-dimensional (2-D) transition metal carbides, referred to as MXenes, attracted considerable attention in various application fields such as biosensors, biomedicine, energy conversion, electrocatalysis, environmental sensing, and nonlinear optics and photonics. This study examined the nonlinear optical properties of a vanadium-based MXene, V2C, at 1.9 mu m wavelengths both theoretically and experimentally. First, the energy band structure and the corresponding optical parameters (real part and imaginary part of the refractive index and absorption coefficient) were calculated using density functional theory (DFT) calculations to determine the material potential. Second, the nonlinear optical properties of absorption and the refractive index of the V2C MXene were investigated systemically using both open-aperture (OA) and closed-aperture (CA) Z-scan techniques. Through the Z-scan measurements, the nonlinear optical parameters including a nonlinear absorption coefficient (beta) and a nonlinear refractive index (n(2)) could be obtained in the 1.9 mu m spectral region. The beta and n(2) were measured to be similar to-29.67 x 10(4) cm GW(-1) and similar to-0.61 cm(2) GW(-1), respectively. Finally, the femtosecond mode-locking capability of V2C nanosheets as a base material for an ultrafast mode-locker was tested by fabricating and inserting an all-fiberized saturable absorber into a Tm-Ho-fiber cavity. Stable mode-locked pulses with a temporal width of similar to 843 fs were generated at 1900 nm.