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《光电工程》 2017年01期
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Ultra-broadband terahertz polarization transformers using dispersion-engineered anisotropic metamaterials

Po Chen  
【摘要】:We propose the design of anisotropic metamaterials with cascading meta-atoms.Each meta-atom array behaves as an impedance-tuned interface and dramatically modifies the complex reflection and transmission coefficients.By engineering the frequency-dependent impedances,the reflection phase difference along the two axes of anisotropic metamaterials approximates to a constant in a wide range.We numerically demonstrate the proposed anisotropic metamaterials can accomplish achromatic polarization transformation from 0.5 THz to 3.1 THz.The polarization conversion ratio is higher than 80%,which exhibits excellent agreements with the theoretical calculation.Such design is scalable to other bands and can provide helpful guidance in broadband devices design.
【作者单位】Department
【关键词】polarization conversion terahertz cascaded meta-atoms array
【基金】:supported in part by National Science Foundation(NSF)
【分类号】:O441.4
【正文快照】:
1 Introduction The ability to manipulate the polarization of electromagnetic waves is sought-after for numerous applications.Traditional polarization rotation devices utilizing natural occurring birefringence or total internal reflection effects are bul

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