光子时间晶体的二次谐波产生与非线性频率转换

IF 23.4 Q1 OPTICS

Light-Science & Applications Pub Date : 2025-04-02 DOI:10.1038/s41377-025-01788-z

Noa Konforty, Moshe-Ishay Cohen, Ohad Segal, Yonatan Plotnik, Vladimir M. Shalaev, Mordechai Segev

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引用次数: 0

摘要

研究了折射率随时间突变和周期性变化的光子时间晶体中二次谐波产生的非线性过程，得到了该过程的相位匹配条件。我们发现，即使在没有相位匹配的情况下，二次谐波的产生也会被光子时间晶体的动量间隙中的模式的指数增长所控制。此外，在这些条件下，高阶谐波级联以增长的指数速率产生。该过程是鲁棒的，不需要相位匹配，共振或阈值的存在，从调制中吸取能量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Second harmonic generation and nonlinear frequency conversion in photonic time-crystals

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Second harmonic generation and nonlinear frequency conversion in photonic time-crystals

We study the nonlinear process of second harmonic generation in photonic time-crystals, materials with refractive index that varies abruptly and periodically in time, and obtain the phase matching condition for this process. We find conditions for which the second harmonic generation is highly enhanced even in the absence of phase matching, governed by the exponential growth of the modes residing in the momentum gap of the photonic time crystal. Additionally, under these conditions, a cascade of higher-order harmonics is generated at growing exponential rates. The process is robust, with no requirement for phase-matching, the presence of a resonance or a threshold, drawing energy from the modulation.

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来源期刊

Light-Science & Applications 数理科学, 物理学I, 光学, 凝聚态物性 II ：电子结构、电学、磁学和光学性质, 无机非金属材料, 无机非金属类光电信息与功能材料, 工程与材料, 信息科学, 光学和光电子学, 光学和光电子材料, 非线性光学与量子光学

自引率

0.00%

发文量

803

审稿时长

2.1 months