The FDTD simulation of microring feedback bend-based coupling resonator system for electromagnetically-induced transparency-like effect

A microring feedback bend-based coupling resonant system is proposed and is finite difference time domain (FDTD)-simulated to generate electromagnetically-induced transparency (EIT)-like transmission and mode distribution. The coupling between the cross-section of the waveguides gives rise to EIT-like spectrum. Most of the mode field energy is concentrated in the coupling region of the feedback bend. The full-width at half-maximum (FWHM) can be tuned by controlling the gap parameter between two feedback bends. The device enables integration with some photonic devices on a chip and shows great promise in applications such as fast–slow light and optical filters.