Controlling the gain contribution of background emitters in few-quantum-dot microlasers
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We provide experimental and theoretical insight into single-emitter lasing effects in a quantum dot (QD)-microlaser under controlled variation of background gain provided by off-resonant discrete gain centers. For that purpose, we apply an advanced two-color excitation concept where the background gain contribution of off-resonant QDs can be continuously tuned by precisely balancing the relative excitation power of two lasers emitting at different wavelengths. In this way, by selectively exciting a singleresonant QD and off-resonant QDs, we identify distinct single-QD signatures in the lasing characteristics and distinguish between gain contributions of a single resonant emitter and a countable number of offresonant background emitters to the optical output of the microlaser. Our work addresses the importantquestion whether single-QD lasing is feasible in experimentally accessible systems and shows that, for the investigated microlaser, the single-QD gain needs to be supported by the background gain contribution ofoff-resonant QDs to reach the transition to lasing. Interestingly, while a single QD cannot drive the investigated micropillar into lasing, its relative contribution to the emission can be as high as 70% and it dominates the statistics of emitted photons in the intermediate excitation regime below threshold.
Gericke , F , Segnon , M , von Helversen , M M , Hopfmann , M , Heindel , T , Schneider , C , Höfling , S , Kamp , M , Musiał , A , Porte , X , Gies , C & Reitzenstein , S 2018 , ' Controlling the gain contribution of background emitters in few-quantum-dot microlasers ' New Journal of Physics , vol 20 , 023036 . DOI: 10.1088/1367-2630/aaa477
New Journal of Physics
© 2018 The Author(s). Published by IOP Publishing Ltd on behalf of Deutsche Physikalische Gesellschaft. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Funding: European Research Council under the European Union's Seventh Framework ERC Grant Agreement No. 615613; German Research Foundation via Grant-No.: Re2974/10-1, Gi1121/1-1.
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