Free-standing sub-THz metamaterial with the high Q-factor isolated electric dipole response

Achieving high-Q resonances in the terahertz frequency range is crucial for applications such as sensors, filters, and emitters. One effective strategy for achieving such resonances involves the use of metamaterials. However, the performance of terahertz (THz) metamaterials is often limited by radiation losses in their meta-atoms and in substrates. In this paper, we present both simulation and experimental results of a dual-layer free-standing metamaterial, exhibiting Q-factor of 3570 in the sub-terahertz range, achieved by integrating two complementary planar metamaterial layers that induce an isolated dominant electric dipole moment. This unique metamaterial displays the potential for advances in antennas, quantum computing, THz sensors, offering efficient energy confinement and low losses.