Ultrabroadband reflective polarization convertor for terahertz waves

We design and experimentally demonstrate an ultrathin, ultrabroadband, and highly efficient reflective linear polarization convertor or half-wave retarder operating at terahertz frequencies. The metamaterial-inspired convertor is composed of metallic disks and split-ring resonators placed over a gro...

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Bibliographic Details
Published in:Applied physics letters 2014-11, Vol.105 (18), p.181111
Main Authors: Cheng, Yong Zhi, Withayachumnankul, Withawat, Upadhyay, Aditi, Headland, Daniel, Nie, Yan, Gong, Rong Zhou, Bhaskaran, Madhu, Sriram, Sharath, Abbott, Derek
Format: Article
Language:English
Subjects:
Applied physics
Conversion
Conversion ratio
Disks
Ground plane
Incident waves
Linear polarization
Metamaterials
Terahertz frequencies
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Summary:We design and experimentally demonstrate an ultrathin, ultrabroadband, and highly efficient reflective linear polarization convertor or half-wave retarder operating at terahertz frequencies. The metamaterial-inspired convertor is composed of metallic disks and split-ring resonators placed over a ground plane. The structure exhibits three neighboring resonances, by which the linear polarization of incident waves can be converted to its orthogonal counterpart upon reflection. For an optimal design, a measured polarization conversion ratio for normal incidence is greater than 80% in the range of 0.65–1.45 THz, equivalent to 76% relative bandwidth. The mechanism for polarization conversion is explained via decomposed electric field components that couple with different resonance modes of the structure. The proposed metamaterial design for enhancing efficiency of polarization conversion has potential applications in the area of terahertz spectroscopy, imaging, and communications.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4901272