Deterministic positioning of circular Bragg gratings using atomic force lithography for high-performance quantum dot light sources
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866914531043704832 |
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| author | Dhurjati, Sai Abhishikth Langer, Moritz Zena, Yared G. Rahimi, Ahmad Raith, Liesa Bauer, Martin Fitzek, Frank H. P. Bassoli, Riccardo Hopfmann, Caspar |
| author_facet | Dhurjati, Sai Abhishikth Langer, Moritz Zena, Yared G. Rahimi, Ahmad Raith, Liesa Bauer, Martin Fitzek, Frank H. P. Bassoli, Riccardo Hopfmann, Caspar |
| contents | Semiconductor quantum dots (QDs) grown by molecular beam epitaxy are excellent quantum emitters, but their random spatial distribution hinders deterministic coupling to optical microcavities. We demonstrate a room-temperature atomic force microscopy (AFM)-assisted nano-oxidation lithography technique enabling QD positioning with a radial displacement of $51(28)$ nm. Free-standing asymmetric circular Bragg gratings incorporating AFM-positioned GaAs QDs exhibit a $245$-fold photoluminescence enhancement and fine-structure splitting (FSS) comparable to bulk QDs. Polarization-resolved spectroscopy and finite-difference time-domain simulations show robust emission for displacements up to $50$ nm (Stokes parameter $\lvert S \rvert < 0.05$ ). The devices display stable FSS and polarization imbalance below $5 \, \%$ , confirming precise, reproducible alignment and potential for high fidelity devices. This scalable approach enables deterministic integration of high-performance QDs with photonic cavities, advancing practical quantum light sources for quantum information technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_03672 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Deterministic positioning of circular Bragg gratings using atomic force lithography for high-performance quantum dot light sources Dhurjati, Sai Abhishikth Langer, Moritz Zena, Yared G. Rahimi, Ahmad Raith, Liesa Bauer, Martin Fitzek, Frank H. P. Bassoli, Riccardo Hopfmann, Caspar Materials Science Optics Semiconductor quantum dots (QDs) grown by molecular beam epitaxy are excellent quantum emitters, but their random spatial distribution hinders deterministic coupling to optical microcavities. We demonstrate a room-temperature atomic force microscopy (AFM)-assisted nano-oxidation lithography technique enabling QD positioning with a radial displacement of $51(28)$ nm. Free-standing asymmetric circular Bragg gratings incorporating AFM-positioned GaAs QDs exhibit a $245$-fold photoluminescence enhancement and fine-structure splitting (FSS) comparable to bulk QDs. Polarization-resolved spectroscopy and finite-difference time-domain simulations show robust emission for displacements up to $50$ nm (Stokes parameter $\lvert S \rvert < 0.05$ ). The devices display stable FSS and polarization imbalance below $5 \, \%$ , confirming precise, reproducible alignment and potential for high fidelity devices. This scalable approach enables deterministic integration of high-performance QDs with photonic cavities, advancing practical quantum light sources for quantum information technologies. |
| title | Deterministic positioning of circular Bragg gratings using atomic force lithography for high-performance quantum dot light sources |
| topic | Materials Science Optics |
| url | https://arxiv.org/abs/2605.03672 |