MXene Quantum Dot Synthesis, Optical Properties, and Ultra-narrow Photonics: A Comparison of Various Sizes and Concentrations,Laser & Photonics Reviews

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MXene Quantum Dot Synthesis, Optical Properties, and Ultra-narrow Photonics: A Comparison of Various Sizes and Concentrations
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-08-16 , DOI: 10.1002/lpor.202100059
Zhu Feng ₁ , Gan Yiyu ₁ , Ji Libin ₁ , Wen Qiao ₁

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Transition metal carbides and nitrides (MXene) quantum dots (QDs) are potentially important for versatile applications, including ultra-narrow photonics. Here, a simple method for controlling the sizes and solution concentrations of Ti₂C-MXene-QDs are shown, and then their optical properties are systematically investigated and compared. The nonlinear optical characteristics of QDs can be adjusted through the QD size and solution concentration. QDs with smaller sizes of 1–3 nm have stronger absorptivity, larger modulation depth and lower nonsaturable loss, and QDs with higher concentrations have stronger absorptivity and larger modulation depth but higher nonsaturable loss. These QDs are further applied to construct loop-cavity ultranarrow lasers whose narrowest laser linewidth is 624.5 Hz, highest signal-to-noise ratio (SNR) is 77.63 dB and lowest power fluctuation is 0.4%. A comparison of these indicators indicates that smaller and more homogeneous MXene QD solutions with proper concentrations favor ultra-narrow photonics. The laser power is also amplified to ≈60 mW by an erbium-doped fiber amplifier (EDFA).

中文翻译：

MXene 量子点合成、光学特性和超窄光子学：各种尺寸和浓度的比较

过渡金属碳化物和氮化物 (MXene) 量子点 (QD) 对于包括超窄光子学在内的多种应用具有潜在的重要意义。这里，一种控制 Ti ₂尺寸和溶液浓度的简单方法显示了 C-MXene-QD，然后系统地研究和比较了它们的光学性质。量子点的非线性光学特性可以通过量子点尺寸和溶液浓度进行调整。尺寸较小（1-3 nm）的量子点具有更强的吸收率、更大的调制深度和较低的非饱和损耗，而浓度较高的量子点具有更强的吸收率和更大的调制深度，但不饱和损耗更高。这些量子点进一步应用于构建环形腔超窄激光器，其最窄激光线宽为 624.5 Hz，最高信噪比 (SNR) 为 77.63 dB，最低功率波动为 0.4%。这些指标的比较表明，具有适当浓度的更小、更均匀的 MXene QD 溶液有利于超窄光子学。

更新日期：2021-10-19

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