Single- and Twin-Photons Emitted from Fiber-Coupled Quantum Dots in a Distributed Bragg Reflector Cavity
In this work, we develop single-mode fiber devices of an InAs/GaAs quantum dot (QD) by bonding a fiber array with large smooth facet, small core, and small numerical aperture to QDs in a distributed Bragg reflector planar cavity with vertical light extraction that prove mode overlap and efficient ou...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-04-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/12/7/1219 |
| Summary: | In this work, we develop single-mode fiber devices of an InAs/GaAs quantum dot (QD) by bonding a fiber array with large smooth facet, small core, and small numerical aperture to QDs in a distributed Bragg reflector planar cavity with vertical light extraction that prove mode overlap and efficient output for plug-and-play stable use and extensive study. Modulated Si doping as electron reservoir builds electric field and level tunnel coupling to reduce fine-structure splitting (FSS) and populate dominant XX and higher excitons XX<sup>+</sup> and XXX. Epoxy package thermal stress induces light hole (lh) with various behaviors related to the donor field: lh h<sub>1</sub> confined with more anisotropy shows an additional X<sub>Z</sub> line (its space to the traditional X lines reflects the field intensity) and larger FSS; lh h<sub>2</sub> delocalized to wetting layer shows a fast h<sub>2</sub>–h<sub>1</sub> decay; lh h<sub>2</sub> confined shows D<sub>3h</sub> symmetric higher excitons with slow h<sub>2</sub>–h<sub>1</sub> decay and more confined h<sub>1</sub> to raise h<sub>1</sub>–h<sub>1</sub> Coulomb interaction. |
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| ISSN: | 2079-4991 |