Nonlinear refraction in CH3NH3PbBr3 single crystals

We measure both nonlinear absorption and nonlinear refraction in a CH3NH3PbBr3 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⋅10−14cm2/W for nonlinear absorption and nonlinear refraction, respectively. The sign and magnitud...

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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
Subjects:
Absorption
Crystals
Femtosecond pulses
Insulators
Nonlinearity
Perovskites
Quantum confinement
Refraction
Refractivity
Single crystals
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Summary:We measure both nonlinear absorption and nonlinear refraction in a CH3NH3PbBr3 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⋅10−14cm2/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