Ultrabroadband reflective polarization convertor for terahertz waves
作者： Yong Zhi Cheng , Withawat Withayachumnankul , Aditi Upadhyay , Daniel Headland , Yan Nie
DOI: 10.1063/1.4901272
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摘要: We design and experimentally demonstrate an ultrathin, ultrabroadband, highly efficient reflective linear polarization convertor or half-wave retarder operating at terahertz frequencies. The metamaterial-inspired is composed of metallic disks split-ring resonators placed over a ground plane. structure exhibits three neighboring resonances, by which the incident waves can be converted to its orthogonal counterpart upon reflection. For optimal design, measured conversion ratio for normal incidence greater than 80% in range 0.65–1.45 THz, equivalent 76% relative bandwidth. mechanism explained via decomposed electric field components that couple with different resonance modes structure. proposed metamaterial enhancing efficiency has potential applications area spectroscopy, imaging, communications.
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