超材料宽带圆偏振器的研究进展

摘要

超材料因其独特的性质可以作为选择圆偏振光的器件,即圆偏振器.随着偏振分辨成像系统的重要性日益增强,圆偏振器已被用于增强对比度、圆偏振显微镜以及生物分子的检测,如氨基酸、DNA 和具有固有手性结构的葡萄糖,尤其是在可见光波长下工作的圆偏振器已经引起了人们广泛的关注,已被用作控制复杂显示系统中光的偏振态的关键光学元件.然而通过传统方法获取圆偏振器有很大的局限性,如体积庞大、工作带宽窄等,极大地限制了它们的发展.近几年来,超材料中螺旋结构和堆叠结构的提出,促进了宽带圆偏振器的发展.本文简述了超材料中螺旋结构和堆叠结构形成宽带圆偏振器的偏振原理,详述了两种结构作为宽带圆偏振器的数值模拟和实验研究进展.%The metamaterial can be used as a device for selecting circularly polarized light because of its unique properties, namely circular polarizer.With the increasing importance of polarization resolved imaging system,circular polarizers have been ap-plied to enhanced contrast,circular polarization microscopy and detection of biomolecules such as amino acid,DNA and glucose which have inherent chiral structures.Especially,circular polarizers operating at visible wavelength have attracted much attention be-cause they are exploited as crucial optical components to control the polarization state of light in the complex display systems. However,the traditional circular polarizer for obtaining circularly polarized light has great limitations,such as bulky configuration, narrow working bandwidth and so on,which greatly limits their development to some extent.Recently,the development of broadband circular polarizers has been promoted with the proposed helical structures and stack structures in metamaterials.The polarization prin-ciples of two such kinds of wideband wideband structures are introduced.The numerical simulation and experimental research pro-gress of two such kinds of wideband structures as circular polarizers are reviewed in detail.