Journal
OPTICS EXPRESS
Volume 23, Issue 10, Pages 13376-13383Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.013376
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Funding
- National Natural Science Foundation of China [11404114, 51132004, 61307026]
- China Postdoctoral Science Foundation [2014M550435]
- Fundamental Research Funds for the Central Universities [2014ZB0027, 2013ZM0001]
- Guangdong Natural Science Foundation [S2011030001349]
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Topological insulator (TI) Bi2SeTe2 nanosheets with very regular hexagonal morphology were synthesized by a hydrothermal route. Open aperture (OA) z-scan method was performed to measure the saturable absorption (SA) characteristics of the as-prepared TI Bi2SeTe2 nanosheets. The measured modulation depth, saturation intensity and nonsaturable loss of the sample were 61.9%, 4.46 GW/cm(2) and 4.5% respectively. An ultrafast intraband scattering time of similar to 50 fs was obtained through simulating the SA curve, which indicates the TI Bi2SeTe2 nanosheets may be a good candidate for mode-locking material. (C) 2015 Optical Society of America
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