Abstract
We report optically pumped room-temperature lasing in a square-lattice photonic crystal cavity consisting of two shifted lattice points and heterogeneous lattices with different air hole sizes. Three-dimensional finite-difference time-domain simulation shows that this cavity has an ultrasmall mode volume of 0.017μm3 ∼1.7 (λ∕2nslab)3. Photoluminescence spectroscopy exhibits pulsed lasing action at 1511nm with a low lasing threshold of ∼130μW. The measured Q factor is ∼2400 that is well agreed with the theoretical Q of 4200. In addition, the computational analysis based on the actual fabricated structural parameters unambiguously presents the successful demonstration of this ultrasmall lasing mode.
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