Nonlinear Optical Activities in Two- Dimensional Gallium Sulfide: A Comprehensive Study

被引:45
作者
Ahmed, Safayet [1 ,2 ,3 ]
Cheng, Ping Kwong [1 ,2 ,3 ]
Qiao, Junpeng [1 ,2 ,3 ,5 ,6 ]
Gao, Wei [1 ,2 ,3 ]
Saleque, Ahmed Mortuza [1 ,2 ,3 ]
Ivan, Md Nahian Al Subri [1 ,2 ,3 ]
Wang, Ting [1 ,2 ,4 ]
Alam, Tawsif Ibne [1 ,2 ,3 ]
Hani, Sumaiya Umme [1 ,2 ,3 ]
Guo, Zong Liang [1 ,2 ,3 ]
Yu, Siu Fung [1 ,2 ,3 ]
Tsang, Yuen Hong [1 ,2 ,3 ]
机构
[1] Hong Kong Polytech Univ, Dept Appl Phys, Hung Hom, Kowloon, Hong Kong, Peoples R China
[2] Hong Kong Polytech Univ, Mat Res Ctr, Hung Hom, Kowloon, Hong Kong, Peoples R China
[3] Hong Kong Polytech Univ, Shenzhen Res Inst, Shenzhen 518057, Guangdong, Peoples R China
[4] Chengdu Univ Technol, Coll Mat & Chem & Chem Engn, Chengdu 610059, Peoples R China
[5] Qufu Normal Univ, Res Inst Laser, Sch Phys & Phys Engn, Qufu 273165, Peoples R China
[6] Qufu Normal Univ, Res Inst Laser, Shandong Prov Key Lab Laser Polarizat & Informat T, Qufu 273165, Peoples R China
关键词
two-dimensional materials; gallium sulfide; nonlinear optics; second harmonic generation; nonlinear absorption; 2ND-HARMONIC GENERATION; 2-PHOTON ABSORPTION; GASE;
D O I
10.1021/acsnano.2c03566
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The nonlinear optical (NLO) properties of twodimensional (2D) materials are fascinating for fundamental physics and optoelectronic device development. However, relatively few investigations have been conducted to establish the combined NLO activities of a 2D material. Herein, a study of numerous NLO properties of 2D gallium sulfide (GaS), including second-harmonic generation (SHG), two-photon excited fluorescence (TPEF), and NLO absorption are presented. The layer dependent SHG response of 2D GaS identifies the noncentrosymmetric nature of the odd layers, and the second-order susceptibility (chi 2) value of 47.98 pm/V (three-layers of GaS) indicates the superior efficiency of the SHG signal. In addition, structural deformation induces the symmetry breaking and facilitates the SHG in the bulk samples, whereas a possible efficient symmetry breaking in the liquid-phase exfoliated samples results in an enhancement of the SHG signal, providing prospective fields of investigation for researchers. The generation of TPEF from 800 to 860 nm depicts the two-photon absorption characteristics of 2D GaS material. Moreover, the saturable absorption characteristics of 2D GaS are realized from the largest nonlinear absorption coefficient (beta) of -9.3 x 10(3), -91.0 x 10(3), and -6.05 x 10(3) cm/GW and giant modulation depths (Ts) of 24.4%, 35.3%, and 29.1% at three different wavelengths of 800, 1066, and 1560 nm, respectively. Hence, such NLO activities indicate that 2D GaS material can facilitate in the technical advancements of future nonlinear optoelectronic devices.
引用
收藏
页码:12390 / 12402
页数:13
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