Journal
OPTICS EXPRESS
Volume 22, Issue 13, Pages 16148-16160Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.016148
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Funding
- Fundamental Research Funds for the Central Universities [LZUJBKY-2014-43]
- ARC Australian Post-Doctoral Fellowships via Discovery Projects [DP1092717, DP110100262]
- Victoria and AFAS-Vic Fellowships
- ARC Future Fellowship [FT120100351, FT100100585]
- Australian Research Council [FT120100351] Funding Source: Australian Research Council
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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 degrees. 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. (C) 2014 Optical Society of America
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