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Title: High-Yield Exfoliation of Monolayer 1T '-MoTe2 as Saturable Absorber for Ultrafast Photonics
Authors: Yu, Wei
Dong, Zikai
Abdelwahab, Ibrahim 
Zhao, Xiaoxu 
Shi, Jia 
Shao, Yan 
Li, Jing
Hu, Xiao
Li, Runlai 
Ma, Teng 
Wang, Zhe
Xu, Qing-Hua 
Tang, Ding Yuan
Song, Yanrong
Loh, Kian Ping 
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Science & Technology - Other Topics
Materials Science
1T '-MoTe2
transition metal dichalcogenide
electrochemical exfoliation
organic-inorganic superlattice
Issue Date: 23-Nov-2021
Citation: Yu, Wei, Dong, Zikai, Abdelwahab, Ibrahim, Zhao, Xiaoxu, Shi, Jia, Shao, Yan, Li, Jing, Hu, Xiao, Li, Runlai, Ma, Teng, Wang, Zhe, Xu, Qing-Hua, Tang, Ding Yuan, Song, Yanrong, Loh, Kian Ping (2021-11-23). High-Yield Exfoliation of Monolayer 1T '-MoTe2 as Saturable Absorber for Ultrafast Photonics. ACS NANO 15 (11) : 18448-18457. ScholarBank@NUS Repository.
Abstract: Liquid-phase exfoliation can be developed for the large-scale production of two-dimensional materials for photonic applications. Although atomically thin 2D transition metal dichalcogenides (TMDs) show enhanced nonlinear optical properties or photoluminescence quantum yield relative to the bulk phase, these properties are weak in the absolute sense due to the ultrashort optical path, and they are also sensitive to layer-dependent symmetry properties. Another practical issue is that the chemical stability of some TMDs (e.g., Weyl semimetals) decreases dramatically as the thickness scales down to monolayer, precluding application as optical components in air. To address these issues, a way of exfoliating TMDs that ensures instantaneous passivation needs to be developed. Here, we employed a polymer-assisted electrochemical exfoliation strategy to synthesize PVP-passivated TMDs monolayers that could be spin coated and restacked into organic-inorganic superlattices with well-defined X-ray diffraction patterns. The segregation of restacked TMDs (e.g., MoS2) by PVP allows the inversion asymmetry of individual layers to be maintained in these superlattices, which allows second harmonic generation and photoluminescence to be linearly scaled with thickness. PVP-passivated monolayer 1T'-MoTe2 saturable absorber fabricated from these flakes exhibits fast response and recovery time (<150 fs) and pulse stability. Continuous-wave mode-locking based on 1T'-MoTe2 saturable absorber in a fiber ring laser cavity has been realized, attaining a fundamental repetition rate of 3.15 MHz and pulse duration as short as 867 fs at 1563 nm.
Source Title: ACS NANO
ISSN: 1936-0851
DOI: 10.1021/acsnano.1c08093
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