Struktury tunelowe studnia kwantowa-kropki kwantowe jako ośrodek czynny laserów telekomunikacyjnych

Abstract

Quantum dots (QD) offer many advantages as active material for lasers, however in order to take advantage of them in telecom lasers it is necessary to assure high modulation speed, difficult to achieve in purely QD system due to high population of hot carriers. One of feasible solutions is to use hybrid structures, where a quantum well, separated by a thin barrier from QD layer, serves as a reservoir of carriers supplied directly to the ground state. The article presents several material systems used to realise tunnel injection scheme, enabling emission in the telecom infrared range. Complementary optical spectroscopic techniques are employed to investigate the properties of structures in view of laser applications. There are also presented challenges on the way to obtain a laser based on fast and efficient tunneling. (Quantum well-quantum dot tunnel structures as active material for telecom lasers).