Nonlinear-Optical Response in Zeolitic Imidazolate Framework Glass
Nonlinear-Optical Response in Zeolitic Imidazolate Framework Glass
复制标题
沸石咪唑骨架玻璃中的非线性光学响应
DOI：
10.1021/acs.inorgchem.0c00806
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发表时间：
2020-06-15
影响因子：
4.6
通讯作者：
Qiu, Jianrong
中科院分区：
文献类型：
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作者：
Ali, Mohamed A.;Liu, Xiaofeng;Qiu, Jianrong
最近，金属有机框架（MOFs）已被证实是稳定的玻璃态，从而激发了越来越多的兴趣，发现这些新开发的类型的玻璃的物理化学性质。在这里，我们研究了非线性光学（NLO）响应的Zn和Zn-Co基沸石咪唑骨架-62（ZIF-62）玻璃使用开放孔径Z-扫描技术。我们发现，由于Zn-ZIF-62玻璃在近红外（NIR）光谱区域的光吸收较低，因此其不具有可饱和吸收特征（1030 nm飞秒激光）。相比之下，在Zn-Co-ZIF-62玻璃中观察到NIR吸收带（1100 nm），其表现出具有63.85%的高调制深度的强NLO响应。我们将观测到的非线性光学响应归因于飞秒激光激发时Co离子的T-4（1）（F-4）能级的瞬态饱和。这种MOF玻璃的有趣的NLO特性可能使其在传感和光学调制的光子学领域中具有潜在的应用。
Recently, metal-organic frameworks (MOFs) have been confirmed to be stable in a vitreous state, thus stimulating growing interest in the discovery of the physicochemical properties of these newly explored types of glasses. Herein, we examine the nonlinear-optical (NLO) response of Zn- and Zn-Co-based zeolitic imidazolate framework-62 (ZIF-62) glasses using an open-aperture Z-scan technique. We reveal that the Zn-ZIF-62 glass does not characterize a saturable absorption feature (1030 nm femtosecond laser) owing to its low optical absorption in the near-infrared (NIR) spectral region. In contrast, a NIR absorption band (1100 nm) has been observed in Zn-Co-ZIF-62 glass, which exhibits a strong NLO response with a high modulation depth of 63.85%. We attribute the observed NLO response to transient saturation of the T-4(1)(F-4) level of Co ions upon femtosecond laser excitation. The intriguing NLO properties of this MOF glass may enable potential applications in the photonics fields for sensing and optical modulation.