2023/12/08 by Dušan Lorenc, Ayan A. Zhumekenov, Lorenc, Dusan +5
Engineering · Materials Science · #Chemical Physics (physics.chem-ph) #FOS: Physical sciences #Glass properties and applications #Materials Science (cond-mat.mtrl-sci) #Optics (physics.optics) #Perovskite Materials and Applications #Solid-state spectroscopy and crystallography
paper · pdf · doi:10.48550/arxiv.2312.04946
openalex publication_date 2023/12/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Lead halide perovskites have recently been reported to demonstrate an exceptionally high nonlinear (Kerr) refractive index n2 of up to 10-8 cm2/W in CH3NH3PbBr3. Other researchers however observe different, substantially more conservative numbers. In order to resolve this disagreement the nonlinear Kerr index of a bulk sample of lead halide perovskite was measured directly by means of an interferometer. This approach has many advantages as compared to the more standard z-scan technique. In particular this method allows studying the induced changes to the refractive index in a time-resolved manner, thus enabling to separate the different contributions to n2. The extracted n2 values for CsPbBr3 and MAPbBr3 at λ≈ 1μm are n2=+2.1× 10-14 cm2/W and n2=+6× 10-15 cm2/W respectively hence substantially lower than what has been indicated in most of the previous reports implying the latter should be regarded with a great care.