On-chip light detection using monolithically integrated quantum dot micropillars
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We demonstrate the on-chip detection of light using photosensitive detectors based on quantum dot (QD) micropillar cavities. These microscale detectors are applied exemplarily to probe the emission of a monolithically integrated, electrically pumped whispering gallery mode microlaser. Light is detected via the photocurrent induced in the electrically contacted micropillar detectors under reverse-bias. In order to demonstrate the high potential and applicability of the microdetector presented, we determine the threshold current of an integrated microlaser to be (54 ± 4) μA, in very good agreement with the value of (53 ± 4) μA inferred from optical data. Within this work we realize the monolithic integration of a laser and a detector in a single device operating in the regime of cavity-quantum electrodynamics. Our results thus advance the research on microscale sensor technology towards the few-photon quantum limit and pave the way for on-chip opto-electronic feedback experiments.
Karow , M M , Munnelly , P , Heindel , T , Kamp , M , Höfling , S , Schneider , C & Reitzenstein , S 2016 , ' On-chip light detection using monolithically integrated quantum dot micropillars ' Applied Physics Letters , vol. 108 , no. 8 , 081110 . https://doi.org/10.1063/1.4942650
Applied Physics Letters
© 2016 AIP Publishing LLC. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at http://dx.doi.org/10.1063/1.4942650