磁控石墨烯量子点法拉第旋转机理研究  

A mechanism investigation of Faraday rotation of magnetically controlled graphene quantum dots

作　　者：朱梦南 彭玉峰 韩雪云 ZHU Mengnan;PENG Yufeng;HAN Xueyun(College of Electronic and Electrical Engineering,Henan Normal University,Xinxiang Henan 453007,China;Key Laboratory of Optoelectronic Sensor Integration of Henan Province,Xinxiang Henan 453007,China)

机构地区：[1]河南师范大学电子与电气工程学院,河南新乡453007 [2]河南省光电传感集成重点实验室,河南新乡453007

出　　处：《激光杂志》2020年第10期20-24,共5页Laser Journal

基　　金：河南省重点研发与推广专项(No.182102310006)。

摘　　要：石墨烯量子点具有许多优异的特性,通过研究法拉第旋转与回旋频率、电导率等因素的影响,使其在红外超薄器件、透明导电薄膜等应用方面有着巨大的潜力。旋光角、费尔德常数对法拉第旋转也起着及其关键的作用。因此,利用光电探测器的消光法,研究了磁控石墨烯量子点的旋光角和费尔德常数分别与磁场强度、入射光波长、温度和浓度的变化关系。实验结果表明:石墨烯量子点的旋光角和费尔德常数都会随着波长增加而减小,温度升高而增大。旋光角会随着磁场强度的增强而增大,浓度的增大而减小,对应的费尔德常数大小基本保持稳定。Graphene quantum dots have many superior properties and have great potential in infrared ultrathin devices,transparent conductive films and other applications by studying the influences of Faraday rotation with cyclotron frequency,conductivities and other factors.However,optical rotation angle and Verdet constant also play the key roles in Faraday rotation.Therefore,in this paper,the relationships between the optical rotation angle and the Verdet constant of graphene quantum dots and the magnetic field intensity,incident light wavelength,temperature and concentration are studied respectively using the extinction method of photodetector.It can be seen from the experimental results that both the optical rotation angle and the Verdet constant decrease with the increase of wavelength and increase with the raise of temperature.In addition,the optical rotation angle increases with the enhancement of magnetic field intensity and decreases with the heighten of concentration while the Verdet constant keeps basically stable.

关 键 词：石墨烯量子点 激光 法拉第旋转 旋光角 费尔德常数 

分 类 号：TN249[电子电信—物理电子学]