Nonlinear refraction in CH 3 NH 3 PbBr 3 single crystals

We measure both nonlinear absorption and nonlinear refraction in a ${{\rm CH}_3}{{\rm NH}_3}{{\rm PbBr}_3}$CH NH PbBr single crystal using the Z-scan technique with femtosecond laser pulses. At 1000 nm, we obtain values of 5.2 cm/GW and ${+}{9.5} \cdot {{10}^{ - 14}}\;{{\rm cm}^2}/{\rm W}$+9.5⋅10 cm...

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Bibliographic Details
Published in:Optics letters 2020-04, Vol.45 (8), p.2431
Main Authors: Kriso, Christian, Stein, Markus, Haeger, Tobias, Pourdavoud, Neda, Gerhard, Marina, Rahimi-Iman, Arash, Riedl, Thomas, Koch, Martin
Format: Article
Language:English
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Summary:We measure both nonlinear absorption and nonlinear refraction in a ${{\rm CH}_3}{{\rm NH}_3}{{\rm PbBr}_3}$CH NH PbBr single crystal using the Z-scan technique with femtosecond laser pulses. At 1000 nm, we obtain values of 5.2 cm/GW and ${+}{9.5} \cdot {{10}^{ - 14}}\;{{\rm cm}^2}/{\rm W}$+9.5⋅10 cm /W for nonlinear absorption and nonlinear refraction, respectively. The sign and magnitude of the observed refractive nonlinearity are reproduced well by the two-band model. Our results suggest that the large nonlinear refractive index measured in perovskite nanostructures cannot be explained by an intrinsically high bound-electronic nonlinear refractive index in this emerging material class but is possibly caused by free carriers or quantum confinement effects.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.383917