Luo Si Si, Ruan Ying, Chen Lei
Opt Express. 2021 Feb 15;29(4):5867-5876. doi: 10.1364/OE.415204.
Recently, optically-transparent metasurface based on indium tin oxide (ITO) film has attracted wide attention due to its remarkable optical and electromagnetic characteristics. However, most previous researches on the ITO film mainly focus on the absorption because of its prominent loss-resistance property, but neglecting the further exploration on programmable functions. Here, we present a programmable metasurface based on an optically-transparent ITO glass, on which varactors are integrated to achieve flexible amplitude manipulation range of about 25 dB. More importantly, the presented programmable design can be applied for direct modulation on the carrier incident wave with the desired pre-designed analog wave-form. Within the 10 MHz modulation speed, both programmable amplitude manipulation and analog information modulation are demonstrated in the measurements, showing good agreement with theoretical analysis and simulations. Combining both optical transparency and programmable modulation capability, the presented metasurface will promote the potential applications in wireless communication, internet of things and other smart scenarios.
近年来，基于氧化铟锡（ITO）薄膜的光学透明超表面因其卓越的光学和电磁特性而备受关注。然而，此前大多数关于ITO薄膜的研究主要集中在吸收方面，因为其具有突出的损耗抗性，但却忽略了对可编程功能的进一步探索。在此，我们展示了一种基于光学透明ITO玻璃的可编程超表面，在其上集成了变容二极管，以实现约25 dB的灵活幅度操纵范围。更重要的是，所展示的可编程设计可用于对具有所需预先设计模拟波形的载波入射波进行直接调制。在10 MHz调制速度下，测量结果展示了可编程幅度操纵和模拟信息调制，与理论分析和模拟结果吻合良好。结合光学透明性和可编程调制能力，所展示的超表面将推动其在无线通信、物联网及其他智能场景中的潜在应用。
