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Optical nonlinearity of zeolitic imidazolate framework-67 in the near-infrared region

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Abstract

In this paper, we report the large optical nonlinearities of zeolitic imidazolate framework-67 (ZIF-67) in the near-infrared (NIR) region. Typical Z-scan techniques were carried out to determine the nonlinear optical (NLO) performance of ZIF-67 at 1.06 and 1.34 μm. With increased excitation pump intensity, a reinforcement of the saturable absorption was observed. With the excitation wavelength at 1.06 μm, the largest effective nonlinear absorption coefficient βeff was −0.85 cm GW−1 and the highest modulation depth ΔT was 29.1%. For a wavelength of 1.34 μm, the maximum βeff and ΔT of ZIF-67 were −0.87 cm GW−1 and 19.8%, respectively. The complete optical limiting behavior of ZIF-67 was also investigated with increased pump intensity. The large two-photon absorption (TPA) cross sections (∼8.5 × 106 GM) made ZIF-67 suitable for possible applications as optical limiting devices. In addition, the nonlinear refractive index n2, and real and imaginary parts of the third-order NLO susceptibility were also determined. This work explores the NLO properties of ZIF-67 in the NIR regime comprehensively and will benefit potential NLO-based applications of optical modulators, optoelectronics and optical limiting devices.

Graphical abstract: Optical nonlinearity of zeolitic imidazolate framework-67 in the near-infrared region

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Article information


Submitted
09 Apr 2020
Accepted
30 Apr 2020
First published
07 May 2020

Mater. Chem. Front., 2020, Advance Article
Article type
Research Article

Optical nonlinearity of zeolitic imidazolate framework-67 in the near-infrared region

H. Pan, H. Chu, X. Wang, Y. Li, S. Zhao, G. Li and D. Li, Mater. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QM00226G

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