利用光激发增强三次谐波揭示氧化锌中的新型非线性
Third Harmonic Enhancement Harnessing Photoexcitation Unveils New Nonlinearities in Zinc Oxide
AI总结：
本研究提出利用光激发态与可调电场增强实时调控氧化锌薄膜的THG，实现最高50倍增强并发现二次功率缩放的新机制。
摘要：
非线性光学现象处于高速数据传输、光学逻辑应用以及非互易光学和光子时间晶体设计等新兴领域等多种技术领域的核心。然而，传统非线性材料在制备后对其非线性光学性质进行定制方面存在固有局限。实现对光学非线性的实时控制仍然是一项挑战。在本工作中，我们展示了一种切换三次谐波产生（THG）这一常见非线性光学响应的方法。通过光激发态产生和可调谐电场增强，在氧化锌薄膜中实现了高达50倍的三次谐波产生增强。更有趣的是，增强后的三次谐波产生随入射功率呈二次方缩放，而非传统的三次方缩放，这表明存在一种此前未被报道的三次谐波产生机制。通过调制薄膜中的光学损耗，也可以抑制THG。本工作表明，态的光激发不仅可以增强非线性，还可以创造三次谐波产生的新过程。重要的是，所提出的方法能够实时操控介质的非线性响应。该过程可切换且可逆，调制发生在皮秒时间尺度。我们的研究为增强或抑制固态介质的非线性铺平了道路，从而为非线性光学应用提供稳健、可切换的光源。
英文摘要：
Nonlinear optical phenomena are at the heart of various technological domains such as high-speed data transfer, optical logic applications, and emerging fields such as non-reciprocal optics and photonic time crystal design. However, conventional nonlinear materials exhibit inherent limitations in the post-fabrication tailoring of their nonlinear optical properties. Achieving real-time control over optical nonlinearities remains a challenge. In this work, we demonstrate a method to switch third harmonic generation (THG), a commonly occurring nonlinear optical response. Third harmonic generation enhancements up to 50 times are demonstrated in zinc oxide films via the photoexcited state generation and tunable electric field enhancement. More interestingly, the enhanced third harmonic generation follows a quadratic scaling with incident power, as opposed to the conventional cubic scaling, which demonstrates a previously unreported mechanism of third harmonic generation. The THG can also be suppressed by modulating the optical losses in the film. This work shows that the photoexcitation of states can not only enhance nonlinearities, but can create new processes for third harmonic generation. Importantly, the proposed method enables real-time manipulation of the nonlinear response of a medium. The process is switchable and reversible, with the modulations occurring at picosecond timescale. Our study paves the way to boost or suppress the nonlinearities of solid-state media, enabling robust, switchable sources for nonlinear optical applications.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
