Polar dielectrics with low crystal symmetry and sharp phonon resonances can support hyperbolic shear polaritons, which are highly confined surface modes with frequency-dependent optical axes and asymmetric dissipation features. So far, these modes have been observed only in bulk natural materials at midinfrared frequencies, with properties limited by available crystal geometries and phonon resonance strength. Here, we introduce hyperbolic shear metasurfaces, which are ultrathin engineered surfaces supporting hyperbolic surface modes with symmetry-tailored axial dispersion and loss redistribution that can maximally enhance light-matter interactions. By engineering effective shear phenomena in these engineered surfaces, we demonstrate geometry-controlled, ultraconfined, low-loss hyperbolic surface waves with broadband Purcell enhancements applicable across a broad range of the electromagnetic spectrum.

中文翻译：

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双曲剪切超表面


具有低晶体对称性和尖锐声子共振的极性电介质可以支持双曲剪切极化激元，双曲剪切极化激元是高度受限的表面模式，具有频率相关的光轴和不对称耗散特征。到目前为止，这些模式仅在中红外频率的块状天然材料中观察到，其特性受到可用晶体几何形状和声子共振强度的限制。在这里，我们介绍了双曲剪切超表面，它是支持双曲表面模式的超薄工程表面，具有对称定制的轴向色散和损耗重新分布，可以最大限度地增强光与物质的相互作用。通过在这些工程表面中设计有效的剪切现象，我们展示了几何控制的、超受限的、低损耗的双曲表面波，具有适用于广泛电磁频谱的宽带珀塞尔增强功能。