The research on the optical response of the collected system of the active semiconductor micro-materials

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Very long photon lifetimes and resultant very high quality factors (Q factors) are theoretically achieved in a system where microstructures are arranged periodically to make a closed chain loop. We call it a photonic-atoll resonator. The radiative Q factor reaches an extremely high value in the vicinity of the edges of the light energy bands that could be regarded as the photonic bands created in the quasi-one-dimensional photonic crystal. This resonator is shown to have advantages over other resonators, e.g., a resonator using the defect mode localized in a regular photonic crystal.