期刊
APPLIED PHYSICS LETTERS
卷 111, 期 3, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4994156
关键词
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资金
- National Natural Science Foundation of China [61505088, 61671491]
- National Basic Research Program of China [2014CB339800]
- Natural Science Foundation of Tianjin [15JCQNJC02100]
- Open Fund of the Key Laboratory of Optical Information Science and Technology (Nankai University) [2017KFKT003]
- Fundamental Research Funds for the Central Universities
A compound metasurface for terahertz (THz) wave polarization mode conversion has been experimentally investigated, which is integrated with an H-shaped metallic metamaterial and 45 degrees arranged subwavelength dielectric grating on the two surfaces of a Si substrate. The polarization mode conversion from a TM to a TE resonance mode is achieved at 1.3 THz for forward transmission and 0.63 THz for backward transmission. Based on this property, a unidirectional transmission is obtained with the highest extinction of 23 dB at 0.63 THz. Moreover, due to the multiple reflections and subwavelength integration, a localized resonance mechanism in this metasurface greatly enhances the polarization conversion rate, reduces the insertion loss, and expands the operating bandwidth from 0.3 to 1.6 THz, not merely at the pi phase matching point, which are quite different with the properties of the discrete metallic metamaterial and dielectric grating. This work provides an efficient way towards practical applications in THz broadband polarization conversion, polarization resonance mode manipulation, and unidirectional transmission. Published by AIP Publishing.
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