In order to further demonstrate and understand spontaneous emission (SE) enhancement in solid-state microcavities, we choose to study microdisks, sustaining low V and potentially high Q "whispering gallery modes". We report the fabrication of high quality GaAs microdisks containing InAs quantum boxes (QBs), thanks to an improved process based on two-step wet-etching. Whispering gallery modes display record high Q's (12000 for 2 /spl mu/m diameter disks instead of 3300 for the previous state of the art) corresponding to a very high Fp (/spl sim/150). We also present an original characterization of the Purcell effect in continuous wave photoluminescence. In our structures, the number of QBs coupled to a given mode is not large enough to sustain lasing. When we raise the excitation power, the emission related to the fundamental optical transition of a QB thus saturates when we inject more than one electron-hole pair per lifetime. This behavior is observed for on-resonance as well as off-resonance QBs. However the beginning of the saturation occurs for a much higher pumping power when QBs are resonantly coupled to a cavity mode, which confirms that their radiative lifetime is much shorter due to the Purcell effect. For micropillars, these cw experiments confirm the previously reported results of time-resolved experiments. For microdisks, due to a much larger Purcell factor, we witnessed a SE enhancement as large as 20 for the best structures. The magnitude of this effect is well understood when considering the spatial and spectral distribution of the QBs.


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    Title :

    Cavity-QED experiments on InAs quantum boxes in micropillars and microdisks


    Contributors:
    Gavral, B. (author) / Gerard, J.M. (author)


    Publication date :

    1999-01-01


    Size :

    138831 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Cavity-QED Experiments on InAs Quantum Boxes in Micropillars and Microdisks

    IEEE | British Library Conference Proceedings | 1999


    Strong Purcell effect for quantum boxes in micropillars and microdisks

    Gerard, J.M. / Gayral, B. / Sermage, B. | IEEE | 1999




    Strong Purcell Effect for InAs Quantum Boxes in Three-Dimensional Solid-State Microcavities

    Gerard, J.-M. / Gayral, B. | British Library Online Contents | 1999