论文标题
PT对称性的光学波导中的非对称非线性模式转换
Asymmetric nonlinear-mode-conversion in an optical waveguide with PT symmetry
论文作者
论文摘要
波导中的不对称模式转换对于具有单向效应的芯片片上集成设备具有重要意义，而由于相匹配所施加的限制，因此实现不对称的非线性反传感器（NMC）是具有挑战性的。在这封信中，我们从理论上提出了一种新方案，用于通过在光学波导中结合频率加倍过程和周期性PT对称调制来实现不对称的NMC。通过从PT对称调制的单向动量进行工程，我们证明了使用所需的引导模式从泵到第二谐波的单向转换。我们的发现为用PT对称性操纵非线性光场提供了新的机会，这可以进一步提高对非固有光学辅助的芯片非线性设备的更多探索。
Asymmetric mode transformation in waveguide is of great significance for on-chip integrated devices with one-way effect, while it is challenging to achieve asymmetric nonlinear-mode-conversion (NMC) due to the limitations imposed by phase-matching. In this letter, we theoretically proposed a new scheme for realizing asymmetric NMC by combining frequency-doubling process and periodic PT symmetric modulation in an optical waveguide. By engineering the one-way momentum from PT symmetric modulation, we have demonstrated the unidirectional conversion from pump to second harmonic with desired guided modes. Our findings offer new opportunities for manipulating nonlinear optical fields with PT symmetry, which could further boost more exploration on on-chip nonlinear devices assisted by non-Hermitian optics.
