Photonics Research, 2019, 7 (7): 07000734, Published Online: Jun. 17, 2019
Tunable and scalable broadband metamaterial absorber involving VO2-based phase transition Download: 901次
Abstract
Optical absorbers with dynamic tuning features are able to flexibly control the absorption performance, which offers a good platform for realizing optical switching, filtering, modulating, etc. Here, we propose a thermally tunable broadband absorber applying a patterned plasmonic metasurface with thermo-chromic vanadium dioxide (VO 2 ) spacers. An actively tunable absorption bandwidth and peak resonant wavelength in the region from the near- to mid-infrared (NMIR) are simultaneously achieved with the insulating–metallic phase transition of VO 2 . Moreover, the scalable unit cell, which is composed of multi-width sub-cells, provides a new freedom to further manipulate (i.e., broaden or narrow) the absorption bandwidth while maintaining a high relative absorption bandwidth and efficient absorbance at the same time. For both transverse-electric and transverse-magnetic polarizations, the proposed nanostructure exhibits a high absorption over a wide angular range up to 60°. This method holds a promising potential for versatile utilizations in optical integrated devices, NMIR photodetection, thermal emitters, smart temperature control systems, and so forth.
Lei Lei, Fei Lou, Keyu Tao, Haixuan Huang, Xin Cheng, Ping Xu. Tunable and scalable broadband metamaterial absorber involving VO2-based phase transition[J]. Photonics Research, 2019, 7(7): 07000734.