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Nonlinear Saturable Absorption of Liquid‐Exfoliated Molybdenum/Tungsten Ditelluride Nanosheets
Author(s) -
Mao Dong,
Du Bobo,
Yang Dexing,
Zhang Shengli,
Wang Yadong,
Zhang Wending,
She Xiaoyang,
Cheng Huachao,
Zeng Haibo,
Zhao Jianlin
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201503348
Subject(s) - saturable absorption , materials science , tungsten disulfide , molybdenum disulfide , exfoliation joint , tungsten , molybdenum , optoelectronics , laser , nanotechnology , absorption (acoustics) , graphene , fiber laser , chemical engineering , optics , wavelength , composite material , physics , engineering , metallurgy
Molybdenum disulfide (MoS 2 ) and tungsten disulfide (WS 2 ), two representative transition metal dichalcogenide materials, have captured tremendous interest for their unique electronic, optical, and chemical properties. Compared with MoS 2 and WS 2 , molybdenum ditelluride (MoTe 2 ) and tungsten ditelluride (WTe 2 ) possess similar lattice structures while having smaller bandgaps (less than 1 eV), which is particularly interesting for applications in the near‐infrared wavelength regime. Here, few‐layer MoTe 2 /WTe 2 nanosheets are fabricated by a liquid exfoliation method using sodium deoxycholate bile salt as surfactant, and the nonlinear optical properties of the nanosheets are investigated. The results demonstrate that MoTe 2 /WTe 2 nanosheets exhibit nonlinear saturable absorption property at 1.55 μm. Soliton mode‐locking operations are realized separately in erbium‐doped fiber lasers utilizing two types of MoTe 2 /WTe 2 ‐based saturable absorbers, one of which is prepared by depositing the nanosheets on side polished fibers, while the other is fabricated by mixing the nanosheets with polyvinyl alcohol and then evaporating them on substrates. Numerous applications may benefit from the nonlinear saturable absorption features of MoTe 2 /WTe 2 nanosheets, such as visible/near‐infrared pulsed laser, materials processing, optical sensors, and modulators.