纳米线量子点与薄膜铌酸锂光子平台兼容的动态应变调制
Dynamic strain modulation of a nanowire quantum dot compatible with a thin-film lithium niobate photonic platform
AI总结：
本研究将纳米线量子点集成到铌酸锂平台，通过表面声波实现动态应变调谐发射，保持单光子纯度，并提出了与薄膜波导耦合的器件架构。
摘要：
将按需单光子源集成到光子电路中是片上量子应用的主要先决条件。在各种高质量光源中，纳米线量子点因其沿生长方向的优选发射方向，可以高效耦合到光波导。然而，发射特性的局部调谐仍然具有挑战性。在本工作中，我们将纳米线量子点转移到块状铌酸锂衬底上，并表明其发射可以通过与表面声波的声光耦合进行动态调谐。在应变调制过程中，单光子源的纯度得以保持。我们进一步证明，即使在纳米线顶部沉积一层作为光子电路包层的SiO2封装层，这种换能作用仍然得以维持。基于这些实验结果和数值模拟，我们提出了一种器件架构，该架构由高效耦合到薄膜铌酸锂脊形波导的纳米线量子点组成，并通过表面声波实现应变可调谐。
英文摘要：
The integration of on-demand single photon sources in photonic circuits is a major prerequisite for on-chip quantum applications. Among the various high-quality sources, nanowire quantum dots can be efficiently coupled to optical waveguides because of their preferred emission direction along their growth direction. However, local tuning of the emission properties remains challenging. In this work, we transfer a nanowire quantum dot on a bulk lithium niobate substrate and show that its emission can be dynamically tuned by acousto-optical coupling with surface acoustic waves. The purity of the single photon source is preserved during the strain modulation. We further demonstrate that the transduction is maintained even with a SiO2 encapsulation layer deposited on top of the nanowire acting as the cladding of a photonic circuit. Based on these experimental findings and numerical simulations, we introduce a device architecture consisting of a nanowire quantum dot efficiently coupled to a thin film lithium niobate rib waveguide and strain-tunable by surface acoustic waves.
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