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arXiv 2502.09367physics.opticsquant-ph
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GaAs量子点微柱单光子源的确定性制备

Deterministic fabrication of GaAs-quantum-dot micropillar single-photon sources

Technical University of Denmark(丹麦技术大学);Johannes Kepler University Linz(约翰·开普勒林茨大学)

Abdulmalik A. Madigawa, Martin Arentoft Jacobsen, Claudia Piccinini, Paweł Wyborski, Ailton Garcia, Saimon F. Covre da Silva, Armando Rastelli, Battulga Munkhbat, Niels Gregersen

AI总结:

本研究采用确定性制备技术制备集成GaAs量子点的微柱单光子源,实现100%定位良率,明确了电荷噪声等因素的性能影响,并验证了圆柱环结构提升收集效率的设计局限。

摘要:

本研究采用确定性制备技术,探究了集成于微柱结构中的液滴外延GaAs量子点(QDs)的性能。我们在74个器件上实现了100%的量子点定位良率,且器件性能一致性良好。在p壳层激发下,微柱内的量子点衰减动力学呈现双指数行为,伴随的强度涨落将源效率限制在4.5%以下。通过低功率带隙上LED激发实现电荷稳定化,可有效抑制这类涨落,将源效率提升一倍至约9%。此外,我们引入圆柱环结构抑制辐射模式,理论预测该结构可将收集效率提升4倍,但实验中仅获得有限提升,凸显了即便微小的制备缺陷也会对这一先进设计产生影响。研究结果证实了我们的确定性制备方法在制备高良率、均一性器件方面的可靠性,同时为电荷噪声与复杂弛豫动力学对器件性能的影响提供了详细见解。

英文摘要:

This study investigates the performance of droplet-etched GaAs quantum dots (QDs) integrated into micropillar structures using a deterministic fabrication technique. We demonstrate a unity QD positioning yield across 74 devices and consistent device performance. Under p-shell excitation, the QD decay dynamics within the micropillars exhibit biexponential behavior, accompanied by intensity fluctuations limiting the source efficiency to < 4.5%. Charge stabilization via low-power above-band LED excitation effectively reduces these fluctuations, doubling the source efficiency to $\sim$ 9%. Moreover, we introduce suppression of radiation modes by introducing cylindrical rings theoretically predicted to boost the collection efficiency by a factor of 4. Experimentally, only a modest improvement is obtained, underscoring the influence of even minor fabrication imperfections for this advanced design. Our findings demonstrate the reliability of our deterministic fabrication approach in producing high-yield, uniform devices, while offering detailed insights into the influence of charge noise and complex relaxation dynamics on the performance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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