García-Merino J A, Martínez-González C L, San Miguel C R Torres, Trejo-Valdez M, Martínez-Gutiérrez H, Torres-Torres C
Opt Express. 2016 Aug 22;24(17):19552-7. doi: 10.1364/OE.24.019552.
The impact of vectorial magnetic field effects on electrical conductivity and nonlinear optical transmittance exhibited by multi-wall carbon nanotubes was studied. The samples were synthetized by an aerosol pyrolysis processing route in a thin film form. Optical signals in a two-wave mixing configuration allowed us to identify two orthogonal directions of propagation for a magnetic field travelling through the nanomaterials studied. A selective modification in optical absorption was considered to be induced by magnetic perturbations in the sample. Standard optical Kerr gate measurements were carried out for exploring the third order nonlinear optical behavior of the film. A capacitive effect influenced by optical and magnetic excitations was distinguished to be characteristic of the sample. Magneto-quantum conductivity sensitive to the direction of an external magnetic field interacting with the tubes was analyzed. Magnetically-induced changes in electronic band parameters seem to be the main responsible for the optical and electrical modulation observed in the nanostructures. Immediate applications for developing magneto-optical and magneto-electrical functions can be contemplated.
研究了矢量磁场效应对多壁碳纳米管表现出的电导率和非线性光学透过率的影响。样品通过气溶胶热解工艺路线以薄膜形式合成。两波混频配置中的光信号使我们能够识别穿过所研究纳米材料的磁场的两个正交传播方向。认为样品中的磁扰动会引起光吸收的选择性变化。进行了标准光学克尔门测量以探索薄膜的三阶非线性光学行为。区分出受光和磁激发影响的电容效应是样品的特征。分析了对与碳管相互作用的外部磁场方向敏感的磁量子电导率。磁诱导的电子能带参数变化似乎是纳米结构中观察到的光学和电学调制的主要原因。可以考虑开发磁光和磁电功能的直接应用。
