Terahertz reflectarray as a polarizing beam splitter

Tiaoming Niu, Withawat Withayachumnankul, Aditi Upadhyay, Philipp Gutruf, Derek Abbott, Madhu Bhaskaran, Sharath Sriram, Christophe Fumeaux

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)16148-16160
Number of pages13
JournalOptics Express
Volume22
Issue number13
DOIs
StatePublished - Jun 30 2014
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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