Chegel Raad
Department of physics, Faculty of Science, Malayer University, Malayer, Iran.
Sci Rep. 2024 Dec 28;14(1):31227. doi: 10.1038/s41598-024-82561-x.
This study investigates the optical properties of carbon nanotubes (CNTs) and silicene nanotubes (SiNTs) under the influence of external magnetic fields, focusing on their linear and nonlinear optical responses. A tight-binding model is employed to analyze the effects of magnetic fields on the electronic band structure, dipole matrix elements, and various optical susceptibilities of zigzag CNTs and SiNTs. The results reveal significant magnetic field-induced modifications in both linear and nonlinear optical spectra. Key findings include the splitting of optical peaks, red-shifting of spectral features, and distinct differences between CNTs and SiNTs in their response to magnetic fields. Notably, SiNTs consistently exhibit lower-energy spectral features and enhanced magnetic field sensitivity compared to CNTs. The magnetic field serves as an effective parameter for tuning the position, intensity, and number of peaks in various optical susceptibilities, including linear susceptibility, quadratic electro-optic (DC Kerr) response, and third-harmonic generation. These findings provide valuable insights into the magneto-optical properties of selected nanostructures and highlight the potential of SiNTs for applications in tunable nonlinear optical devices and magneto-optical sensors.
本研究调查了碳纳米管（CNT）和硅烯纳米管（SiNT）在外部磁场影响下的光学性质，重点关注它们的线性和非线性光学响应。采用紧束缚模型来分析磁场对锯齿形碳纳米管和硅烯纳米管的电子能带结构、偶极矩阵元以及各种光学极化率的影响。结果显示，线性和非线性光谱均因磁场而发生显著改变。主要发现包括光学峰的分裂、光谱特征的红移，以及碳纳米管和硅烯纳米管在磁场响应方面的明显差异。值得注意的是，与碳纳米管相比，硅烯纳米管始终呈现出能量较低的光谱特征以及更高的磁场灵敏度。磁场是调节各种光学极化率（包括线性极化率、二次电光（直流克尔）响应和三次谐波产生）中峰的位置、强度和数量的有效参数。这些发现为所选纳米结构的磁光性质提供了有价值的见解，并突出了硅烯纳米管在可调谐非线性光学器件和磁光传感器应用中的潜力。
