Deng Yanhui, Shi Zhonghong, Zheng Yaqin, Zhang Houjiao, Li Haoyang, Li Siyang, Zhou Zhang-Kai
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou, 510275, China.
Adv Sci (Weinh). 2024 Sep;11(34):e2404094. doi: 10.1002/advs.202404094. Epub 2024 Jul 8.
Nonlinear nanophotonic devices have shown great potential for on-chip information processing, quantum source, 3D microfabrication, greatly promoting the developments of integrated optics, quantum science, nanoscience and technologies, etc. To promote the applications of nonlinear nanodevices, improving the nonlinear efficiency, expanding the spectra region of nonlinear response and reducing device thickness are three key issues. Herein, this study focuses on the nonlinear effect of third-harmonic generation (THG), and present a thin Si meta-sructure to improve the THG efficiency in the ultraviolet (UV) region. The measured THG efficiency is up to 10 at an emission wavelength of 309 nm. Also, the THG nanosystem is only 100 nm in thickness, which is two-five times thinner than previous all-dielectric nanosystems applied in THG studies. These findings not only present a powerful thin meta-structure with highly efficient THG emission in UV region, but also provide a constructive avenue for further understanding the light-matter interactions at subwavelength scales, guiding the design and fabricating of advanced photonic devices in future.
非线性纳米光子器件在片上信息处理、量子源、3D微纳加工等方面展现出巨大潜力，极大地推动了集成光学、量子科学、纳米科学与技术等领域的发展。为促进非线性纳米器件的应用，提高非线性效率、拓展非线性响应的光谱区域以及减小器件厚度是三个关键问题。在此，本研究聚焦于三次谐波产生（THG）的非线性效应，并提出一种薄硅超结构以提高紫外（UV）区域的THG效率。在309nm发射波长下测得的THG效率高达10。此外，THG纳米系统厚度仅为100nm，比先前用于THG研究的全介质纳米系统薄两到五倍。这些发现不仅展示了一种在紫外区域具有高效THG发射的强大薄超结构，还为进一步理解亚波长尺度下的光与物质相互作用提供了建设性途径，为未来先进光子器件的设计与制造提供了指导。
