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Saturable absorption in graphene/Bi2Te3 heterostructures at 2.8 μm
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DOI：10.1117/1.OE.65.4.047104.png)
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Abstract
En 中文
We investigated the saturable absorption (SA) properties of a graphene/Bi2Te3 heterostructure at 2.8 mu m wavelength experimentally. The graphene/Bi2Te3 heterostructure has been prepared via the chemical vapor deposition method, and the SA behavior has been confirmed with the open-aperture Z-scan measurements at 2.8 mu m wavelength with a modulation depth of 42% and a saturation intensity of 1.38 GW/cm(2), respectively. In addition, the density-functional-theory calculations have been performed to obtain detailed information on the interfacial electronic structure and charge transfer of the heterostructure, confirming the enhanced optical absorption in the heterostructure in the mid-infrared regime. These results demonstrate that the graphene/Bi2Te3 heterostructures are promising nonlinear optical material toward mid-infrared spectral range.
Keywords:
nonlinear optics
heterostructure
Z-scan
density functional theory
saturable absorption
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178
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