Chen Lingling, Song Zhengyong
Opt Express. 2020 Mar 2;28(5):6565-6571. doi: 10.1364/OE.388066.
By introducing vanadium dioxide film into a multilayer structure, the dual functionalities of perfect absorption and high transmission are presented using the insulator-to-metal phase transition of vanadium dioxide. When vanadium dioxide is in the conducting state, the designed system acts as a narrowband absorber. The proposed absorber is composed of the top metallic ring, silica spacer, and the vanadium dioxide film. The absorption peak is originated from localized magnetic resonance between metallic ring and vanadium dioxide film. When vanadium dioxide is in the insulating state, the designed system acts as a transparent conducting metal. The top metallic ring, the middle dielectric spacer, and the subwavelength metallic mesh are combined together to form an antireflection coating. The influences of incident angle and structure parameter on absorption and transmission are also discussed. This work has demonstrated a new route for developing vanadium dioxide-based switchable photonic devices in the fields of filter and modulator at terahertz frequencies.
通过将二氧化钒薄膜引入多层结构中，利用二氧化钒的绝缘体-金属相变展现出完美吸收和高透射的双重功能。当二氧化钒处于导电状态时，所设计的系统充当窄带吸收器。所提出的吸收器由顶部金属环、二氧化硅间隔层和二氧化钒薄膜组成。吸收峰源于金属环与二氧化钒薄膜之间的局域磁共振。当二氧化钒处于绝缘状态时，所设计的系统充当透明导电金属。顶部金属环、中间电介质间隔层和亚波长金属网组合在一起形成抗反射涂层。还讨论了入射角和结构参数对吸收和透射的影响。这项工作为在太赫兹频率的滤波器和调制器领域开发基于二氧化钒的可切换光子器件开辟了一条新途径。
