• Photonics Research
  • Vol. 7, Issue 7, 734 (2019)
Lei Lei1,4,*, Fei Lou2,5,*, Keyu Tao1, Haixuan Huang3..., Xin Cheng2 and Ping Xu1|Show fewer author(s)
Author Affiliations
  • 1College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China
  • 2School of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen 518055, China
  • 3College of Big Data and Internet, Shenzhen Technology University, Shenzhen 518118, China
  • 4e-mail: leilei@szu.edu.cn
  • 5e-mail: louf@sustc.edu.cn
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    DOI: 10.1364/PRJ.7.000734 Cite this Article Set citation alerts
    Lei Lei, Fei Lou, Keyu Tao, Haixuan Huang, Xin Cheng, Ping Xu, "Tunable and scalable broadband metamaterial absorber involving VO2-based phase transition," Photonics Res. 7, 734 (2019) Copy Citation Text show less

    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 (VO2) 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 VO2. 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.
    εVO2(T)=f(T)εins+[1f(T)]εmetal,(1)

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    f(T)=1/[exp(TTcB·Tc)+1],(2)

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    Lei Lei, Fei Lou, Keyu Tao, Haixuan Huang, Xin Cheng, Ping Xu, "Tunable and scalable broadband metamaterial absorber involving VO2-based phase transition," Photonics Res. 7, 734 (2019)
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