As the most stable allotrope of phosphorus, violet phosphorus (VP) has attracted extensive research in the field of all‐optical modulation due to its excellent broadband spatial self‐phase modulation (SSPM) effect. To better exploit the great potential of VP in nonlinear photonics devices, this work explores chemical doping method to artificially enhance the nonlinear optical response of VP. Herein, silver‐modified few‐layer VP (Ag‐VP) is constructed for SSPM experiments. In comparison to pristine VP, a significantly improved third‐order nonlinear susceptibility (χ(3)) and nonlinear optical response for Ag‐VP is obtained in visible light band, and the enhancement ratio increases with the increase of wavelength. Moreover, the excitation threshold of SSPM effect is also significantly reduced, with a reduction ratio up to 3.61. The enhanced nonlinear optical response is attributed to the improved light–matter interaction induced by impurity energy levels. By taking advantage of the outstanding SSPM effect of Ag‐VP, an all‐optical logic gate is designed to demonstrate “OR” logical information transmission. This work provides a new avenue for the design and application of energy‐saving and tunable nonlinear photonic devices in the future.

中文翻译：

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银改性紫磷中的大型光学非线性增强和全光学逻辑门实现


紫磷 （VP） 作为磷最稳定的同素异形体，由于其优异的宽带空间自相位调制 （SSPM） 效应，在全光调制领域引起了广泛的研究。为了更好地开发 VP 在非线性光子器件中的巨大潜力，本文探索了化学掺杂方法，以人为增强 VP 的非线性光学响应。在此，构建了用于 SSPM 实验的银改性少层 VP （Ag-VP）。与原始 VP 相比，Ag-VP 在可见光波段的三阶非线性磁化率 （χ（3）） 和非线性光学响应显著改善，并且增强比随着波长的增加而增加。此外，SSPM 效应的激发阈值也显著降低，降低比高达 3.61。增强的非线性光学响应归因于杂质能级诱导的光-物质相互作用的改善。通过利用 Ag-VP 出色的 SSPM 效应，设计了一个全光逻辑门来演示“OR”逻辑信息传输。这项工作为未来节能和可调谐非线性光子器件的设计和应用提供了一条新的途径。