Abstract
Comparing the Q-factor of electromagnetically induced transparency based on a symmetric and asymmetric quasi-dark resonator has been numerically and experimentally demonstrated. The results show that the Q-factor of electromagnetically induced transparency based on the symmetric quasi-dark mode resonator is an order of magnitude larger than that based on the asymmetric quasi-dark mode resonator. The reason for the improved Q-factor is ascribed to the low radiative loss of the symmetric quasi-dark mode resonator. Furthermore, the proposed way holds promise to obtain a different Q-factor of electromagnetically induced transparency in the microwave, terahertz, and optical frequency range.
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