Abstract-Polarization-dependent thin-film wire-grid reflectarray for terahertz waves

Tiaoming Niu^1,2, Aditi Upadhyay³, Withawat Withayachumnankul^1,4, Daniel Headland¹, Derek Abbott¹, Madhu Bhaskaran³, Sharath Sriram³ andChristophe Fumeaux^1,a)
 HIDE AFFILIATIONS
1 School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, South Australia 5005, Australia
2 School of Information Science and Engineering, Lanzhou University, Lanzhou 730000, People's Republic of China
3 Functional Materials and Microsystems Research Group, RMIT University, Melbourne, Victoria 3001, Australia
4 Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-S9-3, Ookayama, Meguro-ku, Tokyo 152-8552, Japan

A thin-film polarization-dependent reflectarray based on patterned metallic wire grids is realized at 1 THz. Unlike conventional reflectarrays with resonant elements and a solid metal ground, parallel narrow metal strips with uniform spacing are employed in this design to construct both the radiation elements and the ground plane. For each radiation element, a certain number of thin strips with an identical length are grouped to effectively form a patch resonator with equivalent performance. The ground plane is made of continuous metallic strips, similar to conventional wire-grid polarizers. The structure can deflect incident waves with the polarizationparallel to the strips into a designed direction and transmit the orthogonal polarizationcomponent. Measured radiation patterns show reasonable deflection efficiency and highpolarization discrimination. Utilizing this flexible device approach, similar reflectarray designs can be realized for conformal mounting onto surfaces of cylindrical or spherical devices for terahertz imaging and communications.