Improving Q-factor of electromagnetically induced transparency based on mirrored metasurface

Improving Q-factor of analogy of electromagnetically induced transparency (EIT-like) based on the symmetric and asymmetric quasi-dark mode has been numerically demonstrated. The Q-factor of EIT-like based on the symmetric quasi-dark mode (mirrored metasurface) is an order of magnitude larger than the Q-factor of EIT-like based on the asymmetric quasi-dark mode. The low radiative loss of the symmetric quasi-dark mode causes the improved Q-factor. Furthermore, the proposed way of improving the Q-factor has important application in microwave, terahertz and optical metasurface.