Two-Dimensional Gallium Sulfide as a Novel Saturable Absorber for Broadband Ultrafast Photonics Applications,ACS Applied Materials & Interfaces

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Two-Dimensional Gallium Sulfide as a Novel Saturable Absorber for Broadband Ultrafast Photonics Applications
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-11-18 , DOI: 10.1021/acsami.1c18155
Safayet Ahmed _{1,

2} , Junpeng Qiao _{1,

2} , Ping Kwong Cheng _{1,

2} , Ahmed Mortuza Saleque _{1,

2} , Md Nahian Al Subri Ivan _{1,

2} , Tawsif Ibne Alam _{1,

2} , Yuen Hong Tsang _{1,

2}

Affiliation

Two-dimensional (2D) gallium sulfide (GaS) offers a plethora of exceptional electrical and optical properties, allowing it to be used in a wide range of applications, including photodetectors, hydrogen generation, and nonlinear optical devices. In this paper, ultrathin 2D GaS nanosheets are synthesized using the liquid-phase exfoliation method, and the structure, morphology, and chemical composition of the as-prepared nanosheets are extensively investigated. After depositing 2D GaS nanosheets on side polished fibers, successful saturable absorbers (SAs) are fabricated for the first time. The realized modulation depths are 10 and 5.3% at 1 and 1.5 μm, respectively, indicating the wideband saturable absorption performance of the prepared SAs. By integrating GaS-SAs into three different wavelength-based fiber laser cavities, stable mode-locked pulses are achieved, having pulse durations of 46.22 ps (1 μm), 614 fs (1.5 μm), and 1.02 ps (2 μm), respectively. Additionally, different orders of harmonic mode-locked pulses with the highest repetition rate of 0.55 GHz (45th order) and Q-switched pulses with the shortest pulse duration of 2.2 μs are obtained in the telecommunication waveband. These findings suggest that 2D GaS has a lot of potential for broadband ultrafast photonics in nonlinear photonics devices.

中文翻译：

二维硫化镓作为用于宽带超快光子学应用的新型可饱和吸收体

二维 (2D) 硫化镓 (GaS) 提供了大量卓越的电学和光学特性，使其可用于广泛的应用，包括光电探测器、制氢和非线性光学设备。在本文中，使用液相剥离法合成了超薄 2D GaS 纳米片，并广泛研究了所制备纳米片的结构、形貌和化学成分。在侧面抛光的纤维上沉积二维 GaS 纳米片后，首次成功制造了可饱和吸收体 (SA)。在 1 μm 和 1.5 μm 处实现的调制深度分别为 10% 和 5.3%，表明制备的 SA 具有宽带可饱和吸收性能。通过将 GaS-SAs 集成到三个不同波长的光纤激光腔中，实现了稳定的锁模脉冲，脉冲持续时间分别为 46.22 ps (1 μm)、614 fs (1.5 μm) 和 1.02 ps (2 μm)。此外，在电信波段获得了不同阶次的谐波锁模脉冲，最高重复率为0.55 GHz（45阶），调Q脉冲最短脉冲持续时间为2.2 μs。这些发现表明，二维 GaS 在非线性光子学器件中具有很大的宽带超快光子学潜力。

更新日期：2021-12-29

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