Large third-order optical nonlinearities of two-dimensional CsPbBr3 nanoplatelets

Metal halide perovskites show considerable optical nonlinearity and could be used for cost-effective nonlinear optical devices if their nonlinear susceptibilities can be improved. Here, we report large optical nonlinearity, including third-order nonlinear absorption, refraction, and two-photon absor...

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Bibliographic Details
Published in:Applied physics letters 2022-08, Vol.121 (7)
Main Authors: Huang, Ruiqin, Kang, Enze, Gao, Han, Guo, Renbo, Hu, Qingsong, Han, Yibo
Format: Article
Language:English
Subjects:
Absorption cross sections
Applied physics
Metal halides
Nanocrystals
Nonlinear optics
Nonlinearity
Optical limiters
Optical switching
Perovskites
Phase modulation
Photon absorption
Photons
Refraction
Thickness
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Summary:Metal halide perovskites show considerable optical nonlinearity and could be used for cost-effective nonlinear optical devices if their nonlinear susceptibilities can be improved. Here, we report large optical nonlinearity, including third-order nonlinear absorption, refraction, and two-photon absorption excited luminescence, of CsPbBr3 nanoplatelets with a thickness of two or three atomic layers and a plane size of about 60 nm. Specifically, the nonlinear absorption was mainly induced by two-photon absorption at low incident powers, and the nonlinear absorption cross section reached 2.15 × 107 GM. It is two orders of magnitude larger than that of CsPbBr3 nanocrystals, which makes them an ideal optical limiting material. Furthermore, the nanoplatelets exhibited large self-phase modulation-induced nonlinear refraction, and the figures of merit W and T satisfied W >1 and T 
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0106761