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The nonlinear optical transition bleaching in tellurene
Nanoscale ( IF 5.8 ) Pub Date : 2021-08-19 , DOI: 10.1039/d1nr03639d Yiduo Wang 1 , Yingwei Wang 1 , Yulan Dong 2 , Li Zhou 1 , Hao Wei 1 , Mengqiu Long 1 , Si Xiao 1 , Jun He 1
Nanoscale ( IF 5.8 ) Pub Date : 2021-08-19 , DOI: 10.1039/d1nr03639d Yiduo Wang 1 , Yingwei Wang 1 , Yulan Dong 2 , Li Zhou 1 , Hao Wei 1 , Mengqiu Long 1 , Si Xiao 1 , Jun He 1
Affiliation
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To date, outstanding linear and nonlinear optical properties of tellurene, caused by multiple two-dimensional (2D) phases and optical anisotropy, have attracted considerable interest for potential nanophotonics applications. In this work, the ultrafast nonlinear optical (NLO) properties of α-tellurene have been studied via Z-scan and pump–probe techniques at a broadband spectral region. Typical saturable absorption and band filling effects are observed in tellurene due to the Pauli exclusion principle. Analysis using density functional theory (DFT) computation shows the enhancements in NLO response within the ultraviolet–visible absorption spectral region are owing to the increased optical intraband transition in tellurene. Moreover, the effects of varying the photon energy of the probe pulse were explored. Our results indicated that probe pulses with higher photon energies can make smaller differential transmission signal, this effect is found to be negatively correlated with calculated joint density of states (JDOS). These results offer insights into the intrinsic photophysics of 2D tellurene, driving its applications in photonic and optoelectronic fields.
中文翻译：
碲烯中的非线性光学跃迁漂白
迄今为止，由多个二维 (2D) 相和光学各向异性引起的碲烯出色的线性和非线性光学特性引起了潜在纳米光子学应用的极大兴趣。在这项工作中，α-碲烯的超快非线性光学 (NLO) 特性已通过 Z宽带光谱区域的扫描和泵浦探测技术。由于泡利不相容原理，在碲烯中观察到典型的饱和吸收和带填充效应。使用密度泛函理论 (DFT) 计算的分析表明，紫外-可见吸收光谱区域内 NLO 响应的增强是由于碲烯中光学带内跃迁的增加。此外，探索了改变探测脉冲的光子能量的影响。我们的结果表明，具有较高光子能量的探测脉冲可以产生较小的差分传输信号，发现这种效应与计算的联合态密度（JDOS）呈负相关。这些结果提供了对二维碲烯内在光物理的见解，推动了其在光子和光电领域的应用。
更新日期：2021-09-15
中文翻译：
碲烯中的非线性光学跃迁漂白
迄今为止，由多个二维 (2D) 相和光学各向异性引起的碲烯出色的线性和非线性光学特性引起了潜在纳米光子学应用的极大兴趣。在这项工作中，α-碲烯的超快非线性光学 (NLO) 特性已通过 Z宽带光谱区域的扫描和泵浦探测技术。由于泡利不相容原理，在碲烯中观察到典型的饱和吸收和带填充效应。使用密度泛函理论 (DFT) 计算的分析表明，紫外-可见吸收光谱区域内 NLO 响应的增强是由于碲烯中光学带内跃迁的增加。此外，探索了改变探测脉冲的光子能量的影响。我们的结果表明，具有较高光子能量的探测脉冲可以产生较小的差分传输信号，发现这种效应与计算的联合态密度（JDOS）呈负相关。这些结果提供了对二维碲烯内在光物理的见解，推动了其在光子和光电领域的应用。
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