紧凑的线性解耦谐振器用于通过角相位匹配实现高效的自发参量下转换
Compact linearly uncoupled resonators for efficient spontaneous parametric downconversion via angular phase matching
AI总结：
该研究提出了一种紧凑的线性解耦谐振器平台，通过角相位匹配实现高效的自发参量下转换，展示了高光子对生成率和低相关性特征。
摘要：
我们报告了一种基于线性解耦谐振器和角相位匹配的集成平台，用于高效二级非线性相互作用。所提出的架构将相位控制限制在设备的有限部分，从而在同时减少整体占地面积的同时，最大化场增强和有效的非线性相互作用长度。作为示例，我们展示了一个AlGaAs-on-insulator结构的结果，显示在连续波模式下光子对生成率为3.16 GHz/mW，在脉冲泵浦下为5.89 MHz。生成的双光子态具有Schmidt数K=1.02，表明几乎不相关的光子对。这种方法的紧凑性和可重新配置性，以及其不依赖于材料特定的极化技术，使其适用于广泛的一体化χ₂非线性平台。
英文摘要：
We report an integrated platform for efficient second-order nonlinear interactions based on linearly uncoupled resonators and angular phase matching. The proposed architecture confines phase control to a limited section of the device, maximizing field enhancement and effective nonlinear interaction length while simultaneously reducing the overall footprint. As an example we show the results for an AlGaAs-on-insulator structure demonstrating a photon-pair generation rate of 3.16 GHz/mW in the continuous-wave regime and 5.89 MHz under pulsed pumping. The generated biphoton state exhibits a Schmidt number K=1.02, indicating nearly uncorrelated photon pairs. The compact and reconfigurable nature of this approach, together with its independence from material-specific poling techniques, makes it applicable to a broad class of integrated $χ_2$ nonlinear platforms.
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