Tunable metasurfaces open new doors for achieving dynamic wavefront manipulation in an ultracompact footprint. Dielectric metasurfaces are particularly attractive for this application due to their low-loss modes. However, their volumetric modes make them difficult to dynamically tune compared to plasmonic variants with strong field confinement. We overcome this challenge by combining dielectric resonators with an epsilon-near-zero (ENZ) mode in a thin film. By tuning the coupling between modes in the resonators and the ENZ thin film, active control over the transmittance amplitude is achieved. Operating at the wavelength of the Huygens mode, we demonstrate transmittance modulation with an on-state transmittance of 70% and a modulation depth of 31%. In addition, we create a tunable diffraction grating and demonstrate its potential use in beam steering applications. This approach provides a new avenue for high-speed and low-power modulation of dielectric metasurfaces.

中文翻译：

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基于全介电惠更斯超表面的动态传输控制

可调谐的超表面为在超紧凑的占位空间中实现动态波前操纵打开了新的大门。介电超表面由于其低损耗模式而对于这种应用特别有吸引力。但是，与具有强磁场限制的等离激元变体相比，它们的体积模式使它们难以动态调整。我们通过在薄膜中将电介质谐振器与epsilon-near-zero（ENZ）模式结合来克服了这一挑战。通过调整谐振器和ENZ薄膜中各模之间的耦合，可以实现对透射幅度的主动控制。在惠更斯模式的波长下工作，我们演示了透射率调制，其通态透射率为70％，调制深度为31％。此外，我们创建了可调衍射光栅，并演示了其在光束转向应用中的潜在用途。这种方法为介电超表面的高速和低功率调制提供了新途径。