Surface passivation and oxide encapsulation to improve optical properties of a single GaAs quantum dot close to the surface

• URL: http://arxiv.org/abs/2202.02655v1
• Date: Sat, 5 Feb 2022 23:18:12 GMT
• Title: Surface passivation and oxide encapsulation to improve optical properties of a single GaAs quantum dot close to the surface
• Authors: Santanu Manna, Huiying Huang, Saimon Filipe Covre da Silva, Christian Schimpf, Michele B. Rota, Barbara Lehner, Marcus Reindl, Rinaldo Trotta and Armando Rastelli
• Abstract summary: Integration in some nanophotonic structures requires surface-to-dot distances of less than 100 nm. Sulphur passivation with dielectric overlayer as an encapsulation is used for surface to QD distances of 40 nm.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Epitaxial GaAs quantum dots grown by droplet etching have recently shown excellent properties as sources of single photons as well as entangled photon pairs. Integration in some nanophotonic structures requires surface-to-dot distances of less than 100 nm. This demands a surface passivation scheme, which could be useful to lower the density of surface states. To address this issue, sulphur passivation with dielectric overlayer as an encapsulation is used for surface to QD distances of 40 nm, which results in the partial recovery of emission linewidths to bulk values as well as in the increase of the photoluminescence intensity.

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