Journal
APPLIED PHYSICS LETTERS
Volume 121, Issue 7, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0106761
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Funding
- National Natural Science Foundation of China (NSFC) [11974126, 11104097]
- Doctoral Research Foundation Project of Hubei University of Arts and Science [kyqdf2020023]
- Scientific Research Cultivating Project of Hubei University of Arts and Science [2020kypygp004]
- Project of Hubei University of Arts and Science [XK2021027]
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CsPbBr3 nanoplatelets exhibit large optical nonlinearity, including third-order nonlinear absorption, refraction, and two-photon absorption excited luminescence. The nonlinear absorption cross section is two orders of magnitude larger than that of CsPbBr3 nanocrystals, making them suitable for optical limiting. Furthermore, they show large self-phase modulation-induced nonlinear refraction, allowing for optical switching.
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 x 10(7) 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 < 1, which allow for optical switching. The large optical nonlinearity of CsPbBr3 nanoplatelets provides a basis for multifunctional applications in nonlinear optical devices. Published under an exclusive license by AIP Publishing.
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