Journal
OPTICS LETTERS
Volume 45, Issue 8, Pages 2431-2434Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.383917
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- Bundesministerium fur Bildung und Forschung [13N13819]
- Deutsche Forschungsgemeinschaft [HE2698/7-2, RA2841/1-1, RI1551/12-1, RI1551/9-1]
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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(-14 )cm(2)/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. (C) 2020 Optical Society of America
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