CST – Computer Simulation Technology

Title:
Compact Dual-Band Terahertz Quarter-Wave Plate Metasurface
Author(s):
Víctor Torres, Nuria Sánchez, David Etayo, Rubén Ortuño, Miguel Navarro-Cía, Alejandro Martínez, Miguel Beruete
Source:
IEEE PHOTONICS TECHNOLOGY LETTERS
Vol./Issue/Date:
VOL. 26, NO. 16, AUGUST 15, 2014
Year:
2015
Page(s):
pp 1679 - 1682
Keywords:
Quarter-wave plate, terahertz applications, metasurface, extraordinary transmission, birefringence
Abstract:
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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