We propose to construct a microring resonator with a slotted photonic crystal nanobeam and demonstrate its basic resonance characteristics by numerical simulation. Resonance spectra and field localization in the ring at resonant wavelengths are calculated. It is found that in the slotted photonic crystal microring resonator, the optical field of the first passband is well confined in the slot zones between every two holes. Due to the large loss, the quality factor of the structure is less than that of the solid-core waveguide ring with the same parameters.
The transmission characteristics of one-dimensional photonic crystal microring resonators are studied. Transmission spectra and field localization in the ring at resonant wavelengths are calculated. It is indicated that there is a relationship between the number of the periodic circular holes in the ring waveguide and the number of the field localization regions. When the number of the periodic circular holes is even or odd, the number of the localization regions is also even or odd. At the same time, the existence of the coupled-resonator-induced transparency is confirmed by the transmission spectra and field distribution in the ring.