Natural hyperbolic materials have recently attracted great attention due to their capability of supporting spatial mode frequency much higher than artificial metamaterials and the advantage that they do not require nanofabrication processes. For practical applications, however, hyperbolic bulk materials with lower optical losses in shorter wavelength range should be developed. This work presents the electronic structure and dielectric response of an electride Mg₂N, revealing that this material exhibits hyperbolic responses with low optical loss in the visible and plasmonic responses with high‐quality in the near‐infrared range. Negative refraction in the red spectral range has been analytically and numerically demonstrated. In particular, nanoantenna structures of Mg₂N generate strong plasmonic resonances in the near‐infrared and the intensity enhancement in the gap region is one order of magnitude higher compared with silver nanoantenna due to its much higher quality factor, which can find potential applications for nanoplasmonic purposes such as single molecule detections by surface‐enhanced hyper‐Raman spectroscopy and nonlinear wavelength generations at the nanoscale.

中文翻译：

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电极材料Mg2 N的光子结构中可见和强等离子共振中的负折射。

天然双曲线材料由于其支持比人工超材料高得多的空间模式频率的能力，以及它们不需要纳米制造工艺的优势，最近引起了极大的关注。但是，对于实际应用，应该开发在较短波长范围内具有较低光学损耗的双曲线块状材料。这项工作介绍了Mg ₂ N的电子结构和介电响应，表明该材料在可见光和等离子体响应中表现出双曲线响应，光损耗低，在近红外范围内具有高质量。在红色光谱范围内的负折射已得到分析和数值证明。特别是Mg _2的纳米天线结构氮在近红外区域产生强烈的等离子体共振，并且由于其质量因子高得多，因此与银纳米天线相比，间隙区域的强度增强要高一个数量级，可以发现纳米等离子体的潜在应用，例如通过表面增强的高拉曼光谱和纳米级的非线性波长生成。