Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 80: II-VI-compounds other than ZnO

HL 80.4: Vortrag

Donnerstag, 14. März 2013, 12:30–12:45, H15

Blue lasing and strong coupling in ZnSe monolithic microcavities — •Kathrin Sebald, Moritz Seyfried, Sebastian Klembt, Carsten Kruse, Detlef Hommel, and Jürgen Gutowski — Institute of Solid State Physics, University of Bremen, Germany

Microcavity structures which consist of a cavity located between two distributed Bragg reflectors can be used to study light-matter interaction in the weak and strong coupling regime. In this contribution microcavities with one or three ZnSe quantum wells embedded into the cavity are presented. By increasing the number of implemented ZnSe quantum wells strong coupling was demonstrated to be achieved with a Rabi splitting energy in the order of 19 meV. By excitation density dependent measurements the transition from the strong to the weak coupling regime was observed. In addition, sample areas with a smaller quality factor show already at low excitation densities just the bare cavity emission. This cavity emission reveals a minimal lasing threshold of 5 pJ for the cavity photons. From the integrated intensity of the sample in the strong and weak coupling regime the β factor can be estimated which describes the fraction of spontaneous emission coupled into the cavity mode. As expected, the sample area with the pure cavity emission possesses a small β factor of 0.01 comparable to classical VCSEL structures. In contrast to that the β factor reaches a value of 0.18 in the sample area where the strong coupling regime was observed.