Simple Yet Effective Method to Determine Multiphoton Absorption Cross Section of Colloidal Semiconductor Nanocrystals,ACS Photonics

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Simple Yet Effective Method to Determine Multiphoton Absorption Cross Section of Colloidal Semiconductor Nanocrystals
ACS Photonics ( IF 6.5 ) Pub Date : 2020-05-28 , DOI: 10.1021/acsphotonics.0c00505
Arthur Alo ₁ , Leonardo W. T. Barros ₁ , Gabriel Nagamine ₁ , Lucas B. Vieira ₁ , Jun Hyuk Chang ₂ , Byeong Guk Jeong ₂ , Wan Ki Bae ₂ , Lazaro A. Padilha ₁

Affiliation

Colloidal semiconductor nanocrystals (NCs) are on the vanguard of nonlinear optical materials due to their superb optical properties including tunable multiphoton absorption (MPA) with large absorption cross sections. So far, investigating MPA of NCs has been regarded as a difficult task, mostly constrained by the lack of measurement techniques with high precision and consistency. Here, an alternative method to measure the MPA cross section of luminescent NCs is presented. The new method, referred to as multiphoton absorption photoluminescence saturation (MPAPS), does not depend on any specific property of an NC sample, allowing for a precise comparative study of NC samples either holding different structures (e.g., core-only or core–shell heterostructure) or exhibiting slow multicarrier dynamics (e.g., engineered NCs for reduced Auger rates).

中文翻译：

确定胶体半导体纳米晶体多光子吸收截面的简单有效方法

胶体半导体纳米晶体（NCs）由于其出色的光学特性（包括具有大吸收截面的可调谐多光子吸收（MPA））而处于非线性光学材料的先锋。迄今为止，调查NCs的MPA被认为是一项艰巨的任务，主要是由于缺乏具有高精度和一致性的测量技术而受到限制。在这里，提出了一种替代方法来测量发光NC的MPA横截面。这种称为多光子吸收光致发光饱和度（MPAPS）的新方法不依赖于NC样品的任何特定特性，从而可以对具有不同结构（例如，仅核或壳核）的NC样品进行精确的比较研究。异质结构）或表现出较慢的多载流子动力学特性（例如，可降低NC速率的工程NC）。

更新日期：2020-07-15

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