Niu, T.Withayachumnankul, W.Upadhyay, A.Gutruf, P.Abbott, D.Bhaskaran, M.Sriram, S.Fumeaux, C.2014-08-272014-08-272014Optics Express, 2014; 22(13):16148-161601094-40871094-4087http://hdl.handle.net/2440/84678A 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.en© 2014 Optical Society of AmericaJournal article002013897610.1364/OE.22.0161480003380559000942-s2.0-8490369598414095Withayachumnankul, W. [0000-0003-1155-567X]Abbott, D. [0000-0002-0945-2674]Fumeaux, C. [0000-0001-6831-7213]