Artificial magnetism in optical frequencies is one of the most intriguing phenomena associated with metamaterials. The Mie resonance of high-index resonators provides an alternative approach to achieving optical magnetism with simple structures. Given the generally moderate refractive index exhibited by available materials at optical frequencies, Mie resonances usually suffer from coupling between the multipole modes, and the corresponding response of the Mie metasurfaces can be analyzed based on the concept of “meta-optics.” Here, we show that the optical magnetism in high-index resonators can be significantly enhanced by adding a highly reflective back mirror to the system. To highlight the transformative ability of this approach for improving meta-optics in the linear and nonlinear regimes, two proof-of-concept demonstrations are presented. Theoretical modeling reveals that low-pump power ultrafast nonlinear optics can be realized in periodic Si nanodisk arrays backed with a gold film, a system supporting guided resonance modes. Moreover, based on the enhanced magnetism of individual high-index resonators, a pair of silicon cuboids is demonstrated as a magnetic antenna for directional excitation of surface plasmon waves. The interference-enhanced magnetism of high-index resonators provides a disruptive technology for enabling meta-optics comprising ultracompact, high-speed, and power-efficient photonic devices.

中文翻译：

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表面高折射率谐振器中的干涉增强光学磁性：通往高性能超紧凑线性和非线性元光学的途径

光学频率中的人造磁性是与超材料相关的最有趣的现象之一。高指数谐振器的米氏共振提供了一种用简单结构实现光学磁性的替代方法。鉴于可用材料在光学频率下通常表现出中等的折射率，Mie 共振通常会受到多极模式之间的耦合的影响，并且可以基于“元光学”的概念来分析 Mie 超表面的相应响应。在这里，我们展示了通过向系统添加高反射后反射镜可以显着增强高折射率谐振器中的光学磁性。为了突出这种方法在线性和非线性区域中改进元光学的变革能力，提出了两个概念验证演示。理论模型表明，低泵浦功率超快非线性光学器件可以在以金膜为支撑的周期性硅纳米盘阵列中实现，金膜是一种支持引导共振模式的系统。此外，基于单个高指数谐振器的增强磁性，一对硅长方体被证明是用于定向激发表面等离子体波的磁性天线。高折射率谐振器的干扰增强磁性提供了一种颠覆性技术，可实现超紧凑、高速和高能效光子器件组成的元光学。一对硅长方体被证明是用于定向激发表面等离子体波的磁性天线。高折射率谐振器的干扰增强磁性提供了一种颠覆性技术，可实现超紧凑、高速和高能效光子器件组成的元光学。一对硅长方体被证明是用于定向激发表面等离子体波的磁性天线。高折射率谐振器的干扰增强磁性提供了一种颠覆性技术，可实现超紧凑、高速和高能效光子器件组成的元光学。