Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4932590
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Funding
- National 973 Program of China [2012CB315701]
- National Natural Science Fund Foundation of China [61205125, 61475102]
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Ultrathin topological insulator bismuth telluride (Bi2Te3) nanosheets with uniform hexagonal nanostructure have been synthesized by cost-effective solvothermal method. Broadband spatial self-phase modulation phenomena of these topological insulator nanosheets have been observed with 400 nm, 800 nm, and 1070 nm ultrafast lasers. The experimental results suggest that this coherent light scattering is due to the broadband, ultrafast, and large third-order optical nonlinearity of Bi2Te3. With the pulsed laser excitation, the nonlinear refractive index (n(2)) of Bi2Te3 dispersion solution was measured to be similar to 10(-12) m(2)/W, and the third-order nonlinear susceptibility similar to 10(-7) esu. Our work may provide an inroad for developing the nonlinear optical applications based on topological insulators. (C) 2015 AIP Publishing LLC.
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