TY - JOUR
T1 - Two-Dimensional Gallium Sulfide as a Novel Saturable Absorber for Broadband Ultrafast Photonics Applications
AU - Ahmed, Safayet
AU - Qiao, Junpeng
AU - Cheng, Ping Kwong
AU - Saleque, Ahmed Mortuza
AU - Ivan, Md Nahian Al Subri
AU - Alam, Tawsif Ibne
AU - Tsang, Yuen Hong
N1 - Funding Information:
This work was financially supported by the Research Grants Council of Hong Kong, China (GRF 152093/18E), The Innovation and Technology Fund, Hong Kong, China (GHP/040/19SZ), The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, China [grant code: the science and technology innovation commission of Shenzhen (JCYJ20210324141206017)], and The Hong Kong Scholars Program (XJ2019020).
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/12/29
Y1 - 2021/12/29
N2 - 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.
AB - 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.
KW - 2D materials
KW - broadband ultrafast laser
KW - gallium sulfide
KW - nonlinear optics
KW - saturable absorber
UR - http://www.scopus.com/inward/record.url?scp=85119995252&partnerID=8YFLogxK
U2 - 10.1021/acsami.1c18155
DO - 10.1021/acsami.1c18155
M3 - Journal article
C2 - 34793123
AN - SCOPUS:85119995252
SN - 1944-8244
VL - 13
SP - 61518
EP - 61527
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 51
ER -