期刊
LIGHT-SCIENCE & APPLICATIONS
卷 6, 期 -, 页码 -出版社
CHINESE ACAD SCIENCES, CHANGCHUN INST OPTICS FINE MECHANICS AND PHYSICS
DOI: 10.1038/lsa.2017.30
关键词
coherence; laser physics; microlasers; nanolasers; optoelectronics; photon statistics; quantum dots; quantum optics
类别
资金
- European Research Council under the Seventh Framework ERC of European Union [615613]
- German Research Foundation [RE2974/5-1, Ka2318 7-1, JA 619/10-3]
- US Department of Energy [DE-AC04-94AL85000]
- German Science Foundation (DFG)
- German Federal Ministry of Education and Research (BMBF)
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 (high beta-factor). This paper demonstrates that the usual criterion for lasing with a conventional (low beta-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-beta microcavities 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.
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