论文标题
电动驱动的可重编程二氧化钒跨表面，使用二进制控制进行宽带光束驱动
Electrically driven reprogrammable vanadium dioxide metasurface using binary control for broadband beam-steering
论文作者
论文摘要
谐振光学阶段阵列是在光学和NIR机制中完全可重新配置的具有低能消耗，低足够的足迹和高可靠性的有希望的方法。连续可调的谐振结构遭受了固有的缺点，例如低相位范围，振幅相关或极端灵敏度，在单个元素级别上可以精确控制非常具有挑战性。为了绕过这些问题，我们使用1位（二进制）控制进行梁转向进行创新的纳米谐波天线，并探索此类阶段阵列的理论能力。提出并使用逆设计对金属绝缘剂 - 金属结构中夹杂的二氧化钒的热结构进行了优化，以增强其在1550 nm处的性能。使用二进制控制成功实现了超过90°范围的连续光束转向，并且基于理论上的第一原理描述，具有极好的一致性。此外，还达到了1500 nm至1700 nm的宽带响应。还展示了设计制造瑕疵的鲁棒性。可以实现这种简化的方法，以优化基于其他材料或分阶段移动机制的各种功能的可调纳米光阶段阵列元面积。
Resonant optical phased arrays are a promising way to reach fully reconfigurable metasurfaces in the optical and NIR regimes with low energy consumption, low footprint and high reliability. Continuously tunable resonant structures suffer from inherent drawbacks such as low phase range, amplitude-phase correlation or extreme sensitivity that makes precise control at the individual element level very challenging. In order to bypass these issues, we use 1-bit (binary) control for beam steering for an innovative nano-resonator antenna and explore the theoretical capabilities of such phased arrays. A thermally realistic structure based on vanadium dioxide sandwiched in a metal-insulator-metal structure is proposed and optimized using inverse design to enhance its performance at 1550 nm. Continuous beam steering over 90° range is successfully achieved using binary control, with excellent agreement with predictions based on the theoretical first principles description of phased arrays. Furthermore a broadband response from 1500 nm to 1700 nm is achieved. The robustness of the design manufacturing imperfections is also demonstrated. This simplified approach can be implemented to optimize tunable nanophotonic phased array metasurfaces based on other materials or phased shifting mechanisms for various functionalities.
