Atomic-scale structure and nonlinear optical absorption of two-dimensional GeS

doi:10.1016/j.jmst.2023.10.056

J. Mater. Sci. Technol. ›› 2024, Vol. 187: 188-194.DOI: 10.1016/j.jmst.2023.10.056

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Atomic-scale structure and nonlinear optical absorption of two-dimensional GeS

Jijun Zhang^a,b,c,1, Rong Sun^b,1, Yanqi Ge^a,1, Jingyi Wang^b, Zexuan Wang^b, Lijian Meng^d, Francis Leonard Deepak^b, Min Zhang^a, Peng Yin^e, Faliang Cheng^a,*, Zhiming Wang^c,*, Zhongchang Wang^b,*

^aGuangdong Engineering and Technology Research Centre for Advanced Nanomaterials, School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China;
^bInternational Iberian Nanotechnology Laboratory (INL), Avenida Mestre José Veiga, Braga 4715-330, Portugal;
^cInstitute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China;
^dCIETI, ISEP, Polytechnic of Porto, Rua Dr. Antó nio Bernardino de Almeida, Porto 4249-015, Portugal;
^eSchool of Information and Communication, National University of Defence Technology, Wuhan 430035, China

Received:2023-09-17 Revised:2023-10-25 Accepted:2023-10-25 Published:2024-07-10 Online:2024-01-23
Contact: ^*E-mail addresses: chengfl@dgut.edu.cn (F. Cheng),zhmwang@uestc.edu.cn (Z. Wang), zhongchang.wang@inl.int(Z. Wang)
About author:¹These authors contributed equally to this work.

Abstract

Abstract: Germanium sulfide (GeS) represents a typical two-dimensional (2D) material that exhibits fascinating prospects for optoelectronic applications, and the understanding of its atomic-scale structure is crucial to tailoring its desired photonic properties. Here, we systematically investigate the atomic-scale structure of GeS and its nonlinear optical absorption properties. The GeS nanosheets of a thickness of 2, 3 layers exhibit high optical nonlinearity with an effective nonlinear coefficient of -0.318 cm/GW, larger than that of black phosphorous by three orders, which can be applied for the generation of ultrashort-pulse lasers. We fabricate a Tm-doped passively mode-locked fiber laser based on a GeS saturable absorber and achieve a fundamental repetition rate of 9.7 MHz and a pulse duration as short as 1.56 ps at ∼2 µm. These findings suggest that 2D GeS nanosheets could be an efficient nonlinear material in the mid-infrared waveband with potential applications in integrated nonlinear photonics.

Key words: 2D GeS, Atomic structure, Nonlinear saturable absorption, Ultrafast pulse generation

Jijun Zhang, Rong Sun, Yanqi Ge, Jingyi Wang, Zexuan Wang, Lijian Meng, Francis Leonard Deepak, Min Zhang, Peng Yin, Faliang Cheng, Zhiming Wang, Zhongchang Wang. Atomic-scale structure and nonlinear optical absorption of two-dimensional GeS[J]. J. Mater. Sci. Technol., 2024, 187: 188-194.

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Atomic-scale structure and nonlinear optical absorption of two-dimensional GeS

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