饱和吸收
材料科学
超短脉冲
光子学
光电子学
兴奋剂
纳米材料
带隙
激光器
光纤激光器
光学
纳米技术
物理
波长
作者
Li Dong,Hongwei Chu,Shiping Xu,Ying Liu,Shengzhi Zhao,Dechun Li
出处
期刊:Nanophotonics
[De Gruyter]
日期:2021-11-17
卷期号:11 (1): 139-151
被引量:11
标识
DOI:10.1515/nanoph-2021-0549
摘要
Abstract Graphitic carbon nitride (g-C 3 N 4 ) featuring a stable heptazine ring structure and high polymerization degree, was indexed as a high thermochemical stability material, attracting rising research enthusiasm for diverse applications. However, the poor near-infrared (NIR) optical absorption and resulting limited NIR applications were pronounced for g-C 3 N 4 due to its large bandgap of 2.7 eV. In the present work, sulfur-doping was manifested by first-principles calculations to introduce impurity level and result in anisotropic spin splitting in g-C 3 N 4 for enhancing broadband nonlinear optical characteristics in NIR regime. The modified sulfur-doped g-C 3 N 4 (S-C 3 N 4 ) exhibited the maximum effective nonlinear absorption coefficient to be −0.82 cm/GW. Pulse duration within hundred nanoseconds was realized with high modulation stability employing S-C 3 N 4 as saturable absorber in Q-switching operations. Moreover, broadband ultrafast photonics properties were successfully demonstrated in constructed ytterbium-doped and erbium-doped fiber lasers, generating highly stable dissipative soliton and traditional soliton mode-locking pulses. The presented S-C 3 N 4 nanomaterial with remarkable nonlinear optical performances might explicitly boost the development and application of g-C 3 N 4 materials in advanced optoelectronic and ultrafast photonic devices.
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