Two‐Photon Absorption in Monolayer MXenes,Advanced Optical Materials

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Two‐Photon Absorption in Monolayer MXenes
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-03-06 , DOI: 10.1002/adom.201902021
Gaozhong Wang ₁ , Daniel Bennett ₂ , Chuanfang (John) Zhang ₃ , Cormac Ó Coileáin ₃ , Meiying Liang ₃ , Niall McEvoy ₃ , Jing Jing Wang ₁ , Jun Wang _{4,

5} , Kangpeng Wang ₆ , Valeria Nicolosi ₃ , Werner J. Blau ₁

Affiliation

Two‐photon absorption (2PA) is a nonlinear optical (NLO) effect that typically occurs in a conventional semiconductor whose bandgap is larger than the energy of one excited photon but smaller than the energy of two photons. In this work, the experimental observation of strong 2PA in gapless MXene monolayers is reported. This phenomenon is verified by a nonlinear transmission method and ultrafast dynamic studies based on a wavelength‐degenerate, non‐collinear pump‐probe technique. The unconventional 2PA is attributed to the structures of the MXene energy bands near the Fermi level, which favors two‐photon transitions and suppresses one‐photon transitions due to parallel band absorption effects. These results, as well as the measured NLO parameters including the 2PA coefficient, absorption cross‐section, excited carrier lifetimes, and third‐order NLO susceptibility, provide a systematic understanding of the unusual NLO effect in MXenes and may be applied in advanced photonic and optoelectronic devices.

中文翻译：

单层MXene中的两光子吸收

双光子吸收（2PA）是一种非线性光学（NLO）效应，通常发生在带隙大于一个激发光子的能量但小于两个光子的能量的常规半导体中。在这项工作中，报道了在无间隙MXene单层中强2PA的实验观察。这种现象已通过基于波长退化，非共线泵浦探测技术的非线性传输方法和超快速动态研究得到了验证。非常规2PA归因于费米能级附近的MXene能带结构，由于平行带吸收效应，它有利于双光子跃迁并抑制单光子跃迁。这些结果以及测得的NLO参数，包括2PA系数，吸收截面，激发的载流子寿命，

更新日期：2020-03-06

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