Efficient stray-light suppression for resonance fluorescence in quantum dot-micropillars using self-aligned metal apertures
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Within this work we propose and demonstrate a technological approach to efficiently suppress excitation laser stray-light in resonance fluorescence experiments on quantum dot-micropillars. To ensure efficient stray-light suppression, their fabrication process includes a planarization step and the subsequent covering with a titanium mask to fabricate self-aligned apertures at the micropillar positions. These apertures aim at limiting laser straylight in side-excitation vertical-detection configuration, while enabling detection of the optical signal through the top facet of the micropillars. Beneficial effects of these apertures are proven and quantitatively evaluated within a statistical study in which we determine and compare the stray-light suppression of 48 micropillars with and without metal apertures. Actual resonance fluorescence experiments on single quantum dots coupled to the cavity mode prove the relevance of the proposed approach and demonstrate that it will foster further studies on cavity quantum electrodynamics phenomena under coherent optical excitation.
Hopfmann , C , Musial , A , Maier , S , Emmerling , M , Schneider , C , Hoefling , S , Kamp , M & Reitzenstein , S 2016 , ' Efficient stray-light suppression for resonance fluorescence in quantum dot-micropillars using self-aligned metal apertures ' , Semiconductor Science and Technology , vol. 31 , no. 9 , 095007 . https://doi.org/10.1088/0268-1242/31/9/095007
Semiconductor Science and Technology
© 2016, IOP Publishing Ltd. 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 iopscience.iop.org / https://dx.doi.org/10.1088/0268-1242/31/9/095007
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