Terahertz reflectarray as a polarizing beam splitter
Date
2014
Authors
Niu, T.
Withayachumnankul, W.
Upadhyay, A.
Gutruf, P.
Abbott, D.
Bhaskaran, M.
Sriram, S.
Fumeaux, C.
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Journal article
Citation
Optics Express, 2014; 22(13):16148-16160
Statement of Responsibility
Tiaoming Niu, Withawat Withayachumnankul, Aditi Upadhyay, Philipp Gutruf, Derek Abbott, Madhu Bhaskaran, Sharath Sriram and Christophe Fumeaux
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Abstract
A reflectarray is designed and demonstrated experimentally for polarization-dependent beam splitting at 1 THz. This reflective component is composed of two sets of orthogonal strip dipoles arranged into interlaced triangular lattices over a ground plane. By varying the length and width of the dipoles a polarization-dependent localized phase change is achieved on reflection, allowing periodic subarrays with a desired progressive phase distribution. Both the simulated field distributions and the measurement results from a fabricated sample verify the validity of the proposed concept. The designed terahertz reflectarray can efficiently separate the two polarization components of a normally incident wave towards different predesigned directions of ±30°. Furthermore, the measured radiation patterns show excellent polarization purity, with a cross-polarization level below −27 dB. The designed reflectarray could be applied as a polarizing beam splitter for polarization-sensitive terahertz imaging or for emerging terahertz communications.
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© 2014 Optical Society of America