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Emission from quantum-dot high-β microcavities: transition from spontaneous emission to lasing and the effects of superradiant emitter coupling 被引量:3

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摘要 Measured and calculated results are presented for the emission properties of a new class of emitters operating in the cavity quantum electrodynamics regime.The structures are based on high-finesse GaAs/AlAs micropillar cavities,each with an active medium consisting of a layer of InGaAs quantum dots(QDs)and the distinguishing feature of having a substantial fraction of spontaneous emission channeled into one cavity mode(highβ-factor).This paper demonstrates that the usual criterion for lasing with a conventional(lowβ-factor)cavity,that is,a sharp non-linearity in the input–output curve accompanied by noticeable linewidth narrowing,has to be reinforced by the equal-time second-order photon autocorrelation function to confirm lasing.The paper also shows that the equal-time second-order photon autocorrelation function is useful for recognizing superradiance,a manifestation of the correlations possible in high-βmicrocavities operating with QDs.In terms of consolidating the collected data and identifying the physics underlying laser action,both theory and experiment suggest a sole dependence on intracavity photon number.Evidence for this assertion comes from all our measured and calculated data on emission coherence and fluctuation,for devices ranging from light-emitting diodes(LEDs)and cavity-enhanced LEDs to lasers,lying on the same two curves:one for linewidth narrowing versus intracavity photon number and the other for g(2)(0)versus intracavity photon number.
出处 《Light(Science & Applications)》 SCIE EI CAS CSCD 2017年第1期638-645,共8页 光(科学与应用)(英文版)
基金 the European Research Council under the Seventh Framework ERC Grant Agreement No.615613 of the European Union the German Research Foundation via the projects RE2974/5-1,Ka23187-1 and JA 619/10-3 the US Department of Energy under Contract No.DE-AC04-94AL85000 the Technical University Berlin for hospitality and the German Research Foundation via collaborative research center 787 for travel support support from the German Science Foundation(DFG) support from the German Federal Ministry of Education and Research(BMBF).
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