Journal
APPLIED PHYSICS LETTERS
Volume 112, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5024777
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Funding
- National Key R&D Program of China [2017YFA0206304]
- National Basic Research Program of China [2014CB921101, 2011CB301900]
- National Natural Science Foundation of China [61775093, 61378025, 61427812]
- National Young 1000 Talent Plan
- Jiangsu Shuangchuang Team Program
- Jiangsu NSF [BK20170012, BK20140054]
- Australian Research Council [DP 160101474]
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WTe2 is a unique material in the family of transition metal dichalcogenides and it has been proposed as a candidate for type-II Weyl semimetals. However, thus far, studies on the optical properties of this emerging material have been significantly hindered by the lack of large-area, high-quality WTe2 materials. Here, we grow a centimeter-scale, highly crystalline WTe2 ultrathin film (similar to 35 nm) by a pulsed laser deposition technique. Broadband pump-probe spectroscopy (1.2-2.5 mu m) reveals a peculiar ultra-fast optical response where an initial photo-bleaching signal (lasting similar to 3 ps) is followed by a long-lived photoinduced absorption signature. Nonlinear absorption characterization using femtosecond pulses confirms the saturable absorption response of the WTe2 ultrathin films, and we further demonstrated a mode-locked Thulium fiber laser using a WTe2 absorber. Our work provides important insights into linear and nonlinear optical responses of WTe2 thin films. Published by AIP Publishing.
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