Mao Min, Liang Yaoyao, Liang Ruisheng, Zhao Lin, Xu Ning, Guo Jianping, Wang Faqiang, Meng Hongyun, Liu Hongzhan, Wei Zhongchao
Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China.
Nanomaterials (Basel). 2019 Aug 1;9(8):1101. doi: 10.3390/nano9081101.
Vanadium dioxide (VO) is a temperature phase change material that has metallic properties at high temperatures and insulation properties at room temperature. In this article, a novel device has been designed based on the dielectric metasurface consisting of VO and graphene array, which can achieve multiple functions by adjusting temperature and voltage. When the temperature is high (340 K), the device is in the absorption state and its absorptivity can be dynamically controlled by changing the temperature. On the other hand, the device is in the polarization state under room temperature, and the polarization of electromagnetic waves can be dynamically controlled by adjusting the voltage of graphene. This device can achieve a broadband absorber (the maximum absorptance reaches 99.415% at wavelengths ranging from 44 THz to 52 THz) and high polarization conversion efficiency (>99.89%) in the mid-infrared range, which has great advantages over other single-function devices. Our results demonstrate that this multifunctional device may have widespread applications in emitters, sensors, spatial light modulators, IR camouflages, and can be used in thermophotovoltaics and wireless communication.
二氧化钒（VO₂）是一种温度相变材料，在高温下具有金属特性，在室温下具有绝缘特性。在本文中，基于由VO₂和石墨烯阵列组成的介电超表面设计了一种新型器件，该器件可以通过调节温度和电压实现多种功能。当温度较高（340K）时，器件处于吸收状态，其吸收率可通过改变温度进行动态控制。另一方面，器件在室温下处于偏振状态，通过调节石墨烯的电压可动态控制电磁波的偏振。该器件在中红外范围内可实现宽带吸收器（在44太赫兹至52太赫兹波长范围内最大吸收率达到99.415%）和高偏振转换效率（>99.89%），这相对于其他单功能器件具有很大优势。我们的结果表明，这种多功能器件可能在发射器、传感器、空间光调制器、红外伪装等方面有广泛应用，并且可用于热光伏和无线通信。
