Abstract Metasurfaces for chromatic aberration compensation have attracted a lot of research attentions since almost all imaging systems suffer from the intrinsic dispersion of composite materials and the chromatic aberration. However, most of them rely on complicated optimization of the structural parameters, hindering their practical application. Here we proposed a new and simple scheme of metasurface for chromatic aberration compensation based on phase change materials. As a demonstration, Ge2Sb2Te5(GST) is used to design metalens and deflector with reduced chromatic aberration that works over a broad band of wavelengths. Simulation results show that we can simply reduce the chromatic aberration fromλ = 8 μm to λ = 9 μm via uniformly tuning the crystalline fraction of GST. In addition, we demonstrate that the working wavelength can be extended to a wider range fromλ = 8 μm to λ = 11 μm via individually engineering the crystalline fraction of each GST cylinder. Our metadevice serves as a novel paradigm for mid-infrared devices with compensated chromatic aberration, enabling a wide variety of application.

中文翻译：

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用于中红外色差补偿的可调 GST 超表面

摘要 由于几乎所有的成像系统都受到复合材料的固有色散和色差的影响，用于色差补偿的超表面引起了很多研究的关注。然而，它们大多依赖于复杂的结构参数优化，阻碍了它们的实际应用。在这里，我们提出了一种新的简单的超表面方案，用于基于相变材料的色差补偿。作为演示，Ge2Sb2Te5(GST) 用于设计具有减少色差的超透镜和偏转器，可在很宽的波长范围内工作。仿真结果表明，我们可以通过统一调整 GST 的结晶分数，将色差从 λ = 8 μm 简单地降低到 λ = 9 μm。此外，我们证明了通过单独设计每个 GST 圆柱体的结晶分数，工作波长可以扩展到更宽的范围，从 λ = 8 μm 到 λ = 11 μm。我们的元设备作为具有补偿色差的中红外设备的新范例，可实现广泛的应用。