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, ...
[EN] We propose a very compact metasurface that works as a quarter-wave plate at two
different frequencies, 1 THz and 2.2 THz. The fractional bandwidth of the first band is remarkably
32.2%, beyond the state-of-the-art