No extraordinary χ(3) in lead-halide perovskites: placing an upper bound on Kerr nonlinearity by means of time-resolved interferometry

IF 3.1 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Dusan Lorenc, Ayan Zhumekenov, Osman M. Bakr, Zhanybek Alpichshev
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引用次数: 0

Abstract

Lead halide perovskites have recently been reported to demonstrate an exceptionally high nonlinear (Kerr) refractive index n2 of up to 108cm2/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 λ1µm are n2=+2.1×1014cm2/W and n2=+6×1015cm2/W, respectively. Hence, these values are substantially lower than what has been indicated in most of the previous reports, implying the latter one should be regarded with great care.

Abstract Image

铅卤化物过氧化物中没有非同寻常的 χ(3):通过时间分辨干涉测量法确定克尔非线性的上限
最近有报道称,在 CH3NH3PbBr3 中,卤化铅包晶石显示出极高的非线性(克尔)折射率 n2,高达 10-8cm2/W。然而,其他研究人员却观察到了不同的、更为保守的数字。为了解决这一分歧,我们使用干涉仪直接测量了块状卤化铅包晶石样品的非线性克尔折射率。与更标准的 Z 扫描技术相比,这种方法有很多优点。特别是,这种方法能够以时间分辨的方式研究折射率的诱导变化,从而分离出对 n2 的不同贡献。在 λ≈1µm 处,CsPbBr3 和 MAPbBr3 的 n2 值分别为 n2=+2.1×10-14cm2/W 和 n2=+6×10-15cm2/W。因此,这些数值大大低于之前大多数报告中显示的数值,这意味着后一个数值应引起高度重视。
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来源期刊
Physical Review Materials
Physical Review Materials Physics and Astronomy-Physics and Astronomy (miscellaneous)
CiteScore
5.80
自引率
5.90%
发文量
611
期刊介绍: Physical Review Materials is a new broad-scope international journal for the multidisciplinary community engaged in research on materials. It is intended to fill a gap in the family of existing Physical Review journals that publish materials research. This field has grown rapidly in recent years and is increasingly being carried out in a way that transcends conventional subject boundaries. The journal was created to provide a common publication and reference source to the expanding community of physicists, materials scientists, chemists, engineers, and researchers in related disciplines that carry out high-quality original research in materials. It will share the same commitment to the high quality expected of all APS publications.
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