Single-mode lasing action is obtained from a modified octagonal quasiperiodic photonic crystal single-defect microcavity which supports a well-confined whispering gallery mode with ultralow threshold and high-quality factor. Side-mode reduction is achieved by inserting a central air-hole in the cavity region.

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Single-mode lasing action is obtained from a modified octagonal quasi-periodic photonic crystal (OQPC) single-defect micro-cavity which supports a well-confined whispering-gallery-mode (WGM) with ultra-low threshold and high SMSR.