G. Chern, H. Tureci, A. Stone, R. Chang, M. Kneissl, N. Johnson
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Uni-directionally blue emitting spiral-shaped micropillar laser diode
We demonstrate uni-directional emission near 400 nm from lasing InGaN/InGaN multiple quantum-well (MQW) spiral micropillars. Reduction of the lasing threshold (to current densities as low as 4.6 kA/cm/sup 2/ when current-injected) and enhancement of uni-directionality occurs when the microcavity is selectively optically or electrically pumped near its boundary.