Hyperbolic metasurfaces are characterized by an extreme anisotropy of their effective conductivity tensor, which may be induced at visible frequencies by sculpting metals at the subwavelength scale. In this work, we explore practical implementations of hyperbolic metasurfaces at mid-infrared wavelengths, exploiting devices composed of metals and high-index semiconductor materials, which can support the required field confinement and extreme anisotropy required to realize low loss hyperbolic surface waves. In particular, we discuss the role of broken symmetries in these hybrid metasurfaces to enable large and broadband hyperbolic responses spanning the entire mid-infrared wavelength range (3–30 μm). Our findings pave the way to the development of large scale nanophotonic devices to manipulate mid-infrared light, with applications in nonlinear optics due to the high field confinement, light routing at the nanoscale, thermal control and management, and sub diffraction imaging.

双曲超表面的特征在于其有效电导率张量的极端各向异性，这可以通过在亚波长尺度上雕刻金属而在可见频率下诱发。在这项工作中，我们探索了中红外波长双曲超曲面的实际实现，利用由金属和高指数半导体材料组成的器件，这些器件可以支持实现低损耗双曲表面波所需的场限制和极端各向异性。特别是，我们讨论了对称性破缺在这些混合超表面中的作用，以实现跨越整个中红外波长范围（3-30 μ米）。我们的发现为开发用于操纵中红外光的大规模纳米光子器件铺平了道路，由于高场限制、纳米级光路由、热控制和管理以及亚衍射成像在非线性光学中的应用。