MIFP PUBLICATIONS

D. V. Lebedev, M. M. Kulagina, S. I. Troshkov, A. S. Vlasov, V. Y. Davydov, A. N. Smirnov, A. A. Bogdanov, J. L. Merz, J. Kapaldo, A. Gocalinska, G. Juska, S. T. Moroni, E. Pelucchi, D. Barettin, S. Rouvimov, and A. M. Mintairov

Formation, emission, and lasing properties of strain-free InP(As)/AlInAs quantum dots (QDs) embedded in AlInAs microdisk (MD) cavity were investigated using transmission electron microscopy and photoluminescence (PL) techniques. In MD structures, the QDs have the nano-pan-cake shape with the height of ˜2 nm, the lateral size of 20–50 nm, and the density of ˜5x10⁹ cm^-2. Their emission observed at ˜940 nm revealed strong temperature quenching, which points to exciton decomposition. It also showed unexpected type-I character, indicating In-As intermixing as confirmed by band structure calculations. We observed lasing of InP(As) QD excitons into whispering gallery modes in MD having the diameter of ˜3.2 lm and providing a free spectral range of ˜27 nm and quality factors up to Q˜13 000. Threshold of ˜50 W/cm2 and spontaneous emission coupling coefficient of ˜0.2 were measured for this MD-QD system.