Hybrid metamaterial switching for manipulating chirality based on VO2 phase transition

作者：Lv, T. T.; Li, Y. X.; Ma, H. F.; Zhu, Z.; Li, Z. P.; Guan, C. Y.; Shi, J. H.^*; Zhang, H.^*; Cui, T. J.^*

来源：Scientific Reports, 2016, 6(1): 23186.

DOI：10.1038/srep23186

• ACTIVE TERAHERTZ METAMATERIALS
• CONVERSION
• DICHROISM

Polarization manipulations of electromagnetic waves can be obtained by chiral and anisotropic metamaterials routinely, but the dynamic and high-efficiency modulations of chiral properties still remain challenging at the terahertz range. Here, we theoretically demonstrate a new scheme for realizing thermal-controlled chirality using a hybrid terahertz metamaterial with embedded vanadium dioxide (VO2) films. The phase transition of VO2 films in 90 degrees twisted E-shaped resonators enables high-efficiency thermal modulation of linear polarization conversion. The asymmetric transmission of linearly polarized wave and circular dichroism simultaneously exhibit a pronounced switching effect dictated by temperature-controlled conductivity of VO2 inclusions. The proposed hybrid metamaterial design opens exciting possibilities to achieve dynamic modulation of terahertz waves and further develop tunable terahertz polarization devices.

• 出版日期2016-3-22
• 单位哈尔滨工程大学; 东南大学; 东北石油大学; 深圳大学