A strong and dynamically controlled circular dichroism (CD) effect has aroused great attention due to its desirable applications in modern chemistry and life sciences. In this Letter, we propose a graphene–metal hybrid chiral metamaterial to generate mid-infrared CD with an intensity of more than 10%, which can be actively controlled over a wide wavelength range. In addition to the strong tunability, the CD signal intensity of our nanostructure is drastically larger than that of the purely graphene-based chiroptical nanostructures. Our design offers a new strategy for developing tunable chiral metadevices, which could be used in various applications, such as biochemical detection and information processing.

中文翻译：

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石墨烯-金属杂化超材料，可产生强且可调节的圆二色性

强大且动态控制的圆二色性（CD）效应因其在现代化学和生命科学中的理想应用而引起了极大的关注。在这封信中，我们提出了一种石墨烯-金属混合手性超材料，以产生强度超过10％的中红外CD，可以在很宽的波长范围内对其进行主动控制。除了强大的可调性外，我们纳米结构的CD信号强度比纯石墨烯基手性纳米结构的CD信号强度大得多。我们的设计为开发可调谐手性元设备提供了新的策略，该设备可用于各种应用中，例如生化检测和信息处理。