Abstract
Photonic structures with optical resonances beyond a single controllable mode are strongly desired for enhancing light-matter interactions and bringing about advanced photonic devices. However, the realization of effective multimodal photonic structures has been restricted by the limited tunable range of mode manipulation, the spatial dispersions of electric fields or the polarization-dependent excitations. To overcome these limitations, we create a dualmode metasurface by integrating the plasmonic surface lattice resonance and the gap plasmonic modes; this metasurface offers a widely tunable spectral range, good overlap in the spatial distribution of electric fields, and polarization independence of excitation light. To show that such dual-mode metasurfaces are versatile platforms for enhancing light-matter interactions, we experimentally demonstrate a significant enhancement of second-harmonic generation using our design, with a conversion efficiency of 1–3 orders of magnitude larger than those previously obtained in plasmonic systems. These results may inspire new designs for functional multimodal photonic structures.
摘要
克服光子结构中只有单个可控共振模式的问题对于增强光- 物相互作用和实现先进光子器件具有重要意义. 然而, 由于模式调 控的可调范围有限、电场增强的空间分布差异或模式激发具有偏 振依赖等因素的限制, 构建可调的多共振的光子结构一直受到限 制. 为了克服这些局限, 本文将等离激元表面晶格共振模式和间隙 等离激元模式相结合, 构建了一种双共振超表面体系, 该体系具有 覆盖可见光到近红外波段的光谱可调范围以及良好的电场增强空 间重叠性的特点. 为了证明该双共振超构表面的优势, 我们研究了 该体系的二次谐波效应, 发现该双共振超构表面的二次谐波转化 效率比以往等离激元体系效率高1–3个数量级. 以上结果显示, 我 们的发现为制备基于多模式共振光子结构的功能化器件提供了一 个有效方案.
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Acknowledgements
This work was supported by the National Key R&D Program of China (2016YFA0301300), the National Natural Science Foundation of China (11974437 and 91750207), the Key-Area Research and Development Program of Guangdong Province (2018B030329001), Guangdong Special Support Program (2017TQ04C487), Guangdong Natural Science Funds for Distinguished Young Scholars (2017B030306007), Guangdong Natural Science Funds (2020A0505140004), Pearl River S&T Nova Program of Guangzhou (201806010033), the Open Fund of IPOC (BUPT) (IPOC2019A003), and the Fundamental Research Funds for the Central Universities (20lgzd30).
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Zhou ZK conceived the idea of the research. Zhou ZK, Lin L and Xue J designed the research processes. Lin L and Xue J conducted most of the experiments and simulations. Xu H participated in the fabrication process. Zhao Q, Zhang W and Zheng Y performed the simulation of modal strong coupling. Zhou ZK, Wu L, Lin L and Xue J analyzed the results and wrote the manuscript. All authors contributed to the discussion of the manuscript.
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Limin Lin is currently a master candidate at Sun Yat-sen University. She received her B.Eng. (majored in information engineering) from the Department of Optoelectronic Engineering, Jinan University in 2018. Her master research focuses on optical metamaterials and their nonlinear device applications.
Jiancai Xue received his PhD degree (majored in optics) and BSc degree (majored in optical information science and technology) from Sun Yat-sen University in 2018 and 2013, respectively. He has been a postdoctoral fellow at Sun Yat-sen University since 2018. His research focuses on nanophotonics, including plasmonic devices, metasurfaces and functional nano-structures
Zhang-Kai Zhou received his PhD degree in physics from Wuhan University in 2011 and joined Sun Yat-sen University in the same year. He is currently a professor of physics, as well as the deputy dean of the Department of Optics and Optical Engineering, School of Physics, Sun Yatsen University. His research interests mainly focus on the field of meta-optics, including quantum plasmonics, optical metamaterials, and functional nanodevices based on metasurfaces.
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The authors declare no conflict of interest.
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Lin, L., Xue, J., Xu, H. et al. Integrating lattice and gap plasmonic modes to construct dual-mode metasurfaces for enhancing light–matter interaction. Sci. China Mater. 64, 3007–3016 (2021). https://doi.org/10.1007/s40843-021-1686-2
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DOI: https://doi.org/10.1007/s40843-021-1686-2