Compact Dual-Band Terahertz Quarter-Wave Plate Metasurface

“© © 20xx IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.”A dual-band quarter-wave plate based on a modified extraordinary transmission hole array is numerically analyzed and experimentally demonstrated at terahertz frequencies. To control independently orthogonal polarizations, the original square holes are connected with vertical slits and their lateral straight sides are replaced by meander lines. This smart design enables dual-band operation with unprecedented fractional bandwidths in a compact structure. Considering a flattening deviation lower than 40% of the optimum value, a fractional bandwidth of 53.8% and 3.8% is theoretically obtained (16.8% and 2.9% in the experiment) at 1 and 2.2 THz, respectively. At these two frequencies, the structure is 0.13-lambda and 0.29-lambda thick, respectively. Given the compactness of the whole structure and the performance obtained, this quarter-wave plate is presented as a competitive device for the terahertz band.This work was supported by the Spanish Government through the Consolider Engineering Metamaterials under Contract CSD2008-00066 and Contract TEC2011-28664-C02.Torres, V.; Sánchez Losilla, N.; Etayo, D.; Ortuño Molinero, R.; Navarro-Cía, M.; Martínez Abietar, AJ.; Beruete, M. (2014). Compact Dual-Band Terahertz Quarter-Wave Plate Metasurface. IEEE Photonics Technology Letters. 26(16):1679-1682. doi:10.1109/LPT.2014.2330860S16791682261