Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5449530 | Optics Communications | 2017 | 6 Pages |
Abstract
Based on an efficient and bottom-up synthesis technique, Bismuth Selenide (Bi2Se3) nanoplatelets with uniform morphology and average thickness down to 3-7Â nm had been fabricated. Its nonlinear absorption property under high power excitation had been well characterized by our Z-scan measurement system at different illumination wavelengths, and we found that the as-fabricated bi-layer Bi2Se3 nanoplatelets show unique nonlinear optical responses, that is, with a saturable optical intensity of 32Â GW/cm2 (resp. 3.7Â MW/cm2 ) and a modulation depth of 88% (resp. 36%) at 800Â nm (resp. 1565Â nm). By implementing its saturable absorption property, we designed an optical saturable absorber device based on bilayer Bi2Se3 nanoplatelets through deposited them onto the end-facet of optical fiber. The as-fabricated optical saturable absorber device allows for the generation of mode-locking pulses at 1571Â nm with pulse duration of 579Â fs and a repetition rate of 12.54Â MHz at a pump power of 160Â mW. The method on fabricating ultrathin Bi2Se3 nanoplatelets may pave a new way to massive production of large-area topological insulator thin films that can be used in two-dimensional layered materials related photonics device.
Related Topics
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Authors
Yanhua Xu, Hanhan Xie, Guobao Jiang, Lili Miao, Ke Wang, Siying Tang, Xuefeng Yu, Han Zhang, Qiaoliang Bao,