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| CsPbBr3纳米片的三光子非线性吸收性质研究 |
| Study on the three-photon nonlinear optical absorption of all-inorganic perovskite CsPbBr3 nanoplatelets |
| 投稿时间：2020-06-30 |
| DOI：10.3969/j.issn.1005-5630.2021.01.008 |
| 中文关键词: CsPbBr3 二维纳米片 非线性光学吸收 |
| 英文关键词:CsPbBr3 two-dimensional nanoplatelets nonlinear optical absorption |
| 基金项目:国家重点研发计划（2016YFF0200306、2017YFF0106304）；上海高校青年东方学者岗位计划 |
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| 中文摘要: |
| 为了研究不同层数纳米片在近红外二区的非线性光学吸收性质的变化，采用配体辅助再沉淀方法制备了不同层数（3～5层）的CsPbBr3纳米片。以中心波长为1030 nm、脉宽为6 ps、重复频率为25 kHz的激光作为激发光源，利用Z-扫描技术研究了CsPbBr3纳米片的非线性三光子吸收光学性质。研究结果表明：CsPbBr3纳米片的非线性三光子吸收截面随层数减小而增大，量子限域效应增强，三层纳米片的三光子吸收截面高达4.1×10-71 cm6s2photon-2。CsPbBr3纳米片在近红外二区具有优良的非线性光学吸收性质，可应用于多光子激发荧光成像领域。 |
| 英文摘要: |
| CsPbBr3 nanoplatelets (NPLs) with different thickness (3-5 monolayers) were synthesized by ligand-assisted reprecipitation at room temperature to study the nonlinear optical absorption properties in the near-infrared-II window. The nonlinear three-photon absorption properties of CsPbBr3 NPLs were investigated by Z-scan technique using a laser with central wavelength of 1030 nm, pulse width of 6 ps and repetition of 25 kHz. The experimental results show that the nonlinear three-photon absorption cross section of CsPbBr3 NPLs is significantly increased due to the enhancement of quantum confinement effect with decreasing the thickness of NPLs. The three-photon absorption cross section of the 3 monolayers NPLs is 4.1×10-71 cm6s2photon-2. This study shows that CsPbBr3 NPLs have excellent nonlinear multiphoton absorption properties in the near-infrared-II window, and can be applied in the field of multiphoton fluorescence imaging. |
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