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In this report, we propose a square lattice photonic crystal heteroslab-edge microcavity design. In numerical simulations, three surface modes in this microcavity are investigated and optimized by tuning the slab-edge termination τ and gradual mirror layer. High simulated quality (Q) factor of 2.3 × 10 5 and small mode volume of 0.105 μm 3 are obtained from microcavity with τ = 0.80. In experiments, we obtain and identify different surface modes lasing. The surface mode in the second photonicdoi:10.1364/oe.18.026461 pmid:21164996 fatcat:bra4jeigingvddayh76sytn6u4