arXiv 2407.106432024-07-15physics.optics

弯曲波导中通过自发四波混频提升光子对产生速率

Enhancement of the photon pair generation rate by spontaneous four-wave mixing in bent waveguides

Maria Paszkiewicz-Idzik, Carsten Rockstuhl

AI总结：

本研究针对非线性光学效应增强需求，提出通过弯曲波导利用模场局域化提升有效非线性，在适中弯曲半径下实现光子对产生速率5%-270%的提升，为集成量子光子器件设计提供新思路。

摘要：

增强非线性光学效应对于提升众多用于非线性和量子光学应用的功能器件的性能至关重要。本文研究了通过弯曲波导来提升自发四波混频过程中光子对产生速率的可能性。尽管直觉可能认为弯曲会降低该过程的效率——因为波导弯曲时损耗更高，但我们表明，对于适中的弯曲半径，有效非线性的提升足以抵消这一劣势。这可以用被导本征模的局域性更好、从而导致模场面积减小来解释。通过研究选定的固定长度波导器件，我们证明在最优弯曲半径下，光子对产生速率可实现5%到270%的优化提升。这些发现对未来用于量子光学应用的集成光子器件设计具有指导意义，尤其是在芯片面积往往成为限制因素的场景中。

英文摘要：

Enhancing nonlinear optical effects is critical to improving the performance of many functional devices for nonlinear and quantum optical applications. Here we study the possibility of bending a waveguide to enhance the photon pair generation rate in a spontaneous four-wave mixing process. Whereas intuition might suggest that bending makes the process less efficient, because the waveguides are more lossy when bent, we show that the increase in the effective nonlinearity outperforms the disadvantage for moderate bending radii. That can be explained by a better localization of the guided eigenmodes, leading to a reduced mode area. By studying selected waveguide devices with a fixed length, we demonstrate an optimal improvement between 5 % and 270 % in the photon pair generation rate for an optimal bending radius. These findings have implications for the future design of integrated photonic devices for quantum optical applications, especially in cases where the chip estate tends to be a limiting factor.

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