Unidirectionally blue emitting spiral-shaped micropillar laser diode
We demonstrate uni-directional emission near 400 nm from lasing InGaN/InGaN multiple quantumwell(MQW) spiral micropillars. Reduction of the lasing threshold (to current densities as low as 4.6 kA/cm2 when current-injected) and enhancement of uni-directionality occurs when the microcavity is selectively optically or electrically pumped near its boundary.
Chern, G. D.; Tureci, H. E.; Stone, A. D.; Chang, R. K.; Kneissl, M. A. ; Johnson, N. M. Unidirectionally blue emitting spiral-shaped micropillar laser diode. LEOS Summer Topicals 2004 Meeting; 2004 June 28-30; San Diego; CA.