CST – Computer Simulation Technology

Compact Dual-Band Terahertz Quarter-Wave Plate Metasurface
Víctor Torres, Nuria Sánchez, David Etayo, Rubén Ortuño, Miguel Navarro-Cía, Alejandro Martínez, Miguel Beruete
VOL. 26, NO. 16, AUGUST 15, 2014
pp 1679 - 1682
Quarter-wave plate, terahertz applications, metasurface, extraordinary transmission, birefringence
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-? and 0.29-? 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.

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