Kim Soo Jin, Brongersma Mark L
Opt Lett. 2017 Jan 1;42(1):5-8. doi: 10.1364/OL.42.000005.
Dynamically-controlled flat optics relies on achieving active and effective control over light-matter interaction in ultrathin layers. A variety of metasurface designs have achieved efficient amplitude and phase modulation. Particularly, noteworthy progress has been made with the incorporation of newly emerging electro-optical materials into such metasurfaces, including graphene, phase change materials, and transparent conductive oxides. In this Letter, we demonstrate dynamic light-matter interaction in a silicon-based subwavelength grating that supports a guided mode resonance. By overcoating the grating with indium tin oxide as an electrically tunable material, its reflectance can be tuned from 4% to 86%. Guided mode resonances naturally afford higher optical quality factors than the optical antennas used in the construction of metasurfaces. As such, they facilitate more effective control over the flow of light within the same layer thickness.
动态控制平面光学依赖于在超薄层中实现对光与物质相互作用的主动且有效的控制。多种超表面设计已实现了高效的幅度和相位调制。特别值得一提的是，将新出现的电光材料纳入此类超表面已取得了显著进展，这些材料包括石墨烯、相变材料和透明导电氧化物。在本信函中，我们展示了在支持导模共振的硅基亚波长光栅中的动态光与物质相互作用。通过用作为电可调材料的氧化铟锡覆盖该光栅，其反射率可从4%调至86%。与用于构建超表面的光学天线相比，导模共振自然具有更高的光学品质因数。因此，它们有助于在相同层厚度内对光的传播进行更有效的控制。
