Realization of a Single-Layer Terahertz Magnetic Mirror

We experimentally demonstrate a single-layer terahertz dielectric metasurface. The metasurface consists of an array of sub-wavelength fibers. It is shown that this single-layer terahertz metasurface has high transmission window and can also behave like a terahertz magnetic or electric mirror due to the excitation of resonances in the fibers. It is also observed that changing the excitation angle (φ > 5°) leads to appearance of new resonances, which narrows and widens the transmission window for s- and p- polarizations, respectively. By exploring the variation of resonances due to excitation of single, double or array of fibers, we have demonstrated that the individual element resonances can interact and lead to high transmission when the fibers are arranged in an array. The proposed single-layer metasurface that can operate both in transmission and reflection mode, opens new opportunities to develop single-layer terahertz devices for wavefront engineering.