二次谐波产生
吸收(声学)
非线性光学
镓
非线性光学
材料科学
双光子吸收
波长
光电子学
光学
非线性系统
激光器
物理
量子力学
复合材料
冶金
作者
Syed M. Ahmed,Ping Cheng,Jian‐Tian Qiao,Wei Gao,Ahmed Mortuza Saleque,Md. Nahian Al Subri Ivan,Ting Wang,Tawsif Ibne Alam,Sumaiya Umme Hani,Zong Liang Guo,Siu Fung Yu,Yuen Hong Tsang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-07-25
卷期号:16 (8): 12390-12402
被引量:20
标识
DOI:10.1021/acsnano.2c03566
摘要
The nonlinear optical (NLO) properties of two-dimensional (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 (χ2) 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 (β) of −9.3 × 103, −91.0 × 103, and −6.05 × 103 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.
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