Journal
APPLIED PHYSICS LETTERS
Volume 101, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4767919
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Funding
- National 973 Program of China [2012CB315701]
- National Natural Science Foundation of China [61025024, 61205125]
- Hunan Provincial Natural Science Foundation of China [12JJ7005]
- Program for New Century Excellent Talents in University of China [NCET 11-0135]
- National Natural Science Fund Foundation of China for Excellent Young Scholars [61222505]
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Under strong laser radiation, a Dirac material, the topological insulator (TI) Bi2Te3, exhibits an optical transmittance increase as a result of saturable absorption. Based on an open-aperture Z-scan measurement at 1550 nm, we clearly show that the TI, Bi2Te3 under our investigation, is indeed a very-high-modulation-depth (up to 95%) saturable absorber. Furthermore, a TI based saturable absorber device was fabricated and used as a passive mode locker for ultrafast pulse formation at the telecommunication band. This contribution unambiguously shows that apart from its fantastic electronic property, a TI (Bi2Te3) may also possess attractive optoelectronic property for ultrafast photonics. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4767919]
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