用于高次谐波产生的超光子学

中文摘要 AI 辅助

我们总结了在光学超光子结构（如孤立谐振器和超表面）中产生高次谐波的最新进展。在这种亚波长图案化结构中，超快激光脉冲与支持各种谐振的结构化平面表面之间的相互作用有望产生极端非线性效应。高次谐波产生（HHG）被认为是实现极紫外光源和阿秒脉冲的有效工具，此前已在气体、液体和固体中观察到。谐振超光子学可以为HHG效应提供一种新颖的亚波长平台，并为设计高效集成光源提供新策略。我们首先简要概述气体、液体和非结构化固体中的HHG，然后总结在单个谐振纳米颗粒和谐振介电超表面中观察到的HHG的最新实验。我们重点关注不同类型的谐振（等离子体谐振与米氏谐振与连续介质中的束缚态），并展示了由强谐振驱动的产生谐波的非整数幂依赖关系的观察结果。我们还提到了当前未解决的问题，并确定了涉及超表面中HHG的新兴有前景的研究方向。

英文摘要

We summarise the recent advances on the generation of high-order harmonics in optical metaphotonic structures such as isolated resonators and metasurfaces. In such subwavelength-patterned structures, extreme nonlinear effects are expected from the interaction between ultrafast laser pulses and structured planar surfaces which support various resonances. High-harmonic generation (HHG) is considered as an effective tool for realising extreme ultraviolet light sources and attosecond pulses, and it was observed previously in gases, liquids, and solids. Resonant metaphotonics can offer a novel sub-wavelength platform for the HHG effects, and it can provide new strategies for the design of efficient integrated light sources. We start our discussion from a brief overview of HHG in gases, liquids, and unstructured solids, and then move to summarising the recent experimental observations of HHG in individual resonant nanoparticles and resonant dielectric metasurfaces. We focus on different types of resonances (plasmonic vs. Mie resonances vs. bound states in the continuum), and also present the observation of non-integer power dependencies of the generated harmonics driven by strong resonances. We also mention current unsolved problems and identify new promising research directions involving HHG in metasurfaces.

发表机构

• Australian National University（澳大利亚国立大学）
• Université Jean Monnet（让·莫内大学）
• The University of Hong Kong（香港大学）

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