摘要
We design and experimentally demonstrate a broadband metamaterial absorber in the terahertz （THz） band based on a periodic array of aluminum （A1） squares with two different sizes. A thin silicon dioxide （SiO2） film rather than a conventional polyimide （PI） layer is used as a dielectric spacer to separate A1 squares from the platinum （Pt） ground plane in our design, which significantly improves the design precision and the feasibility of the device fabrication. The combination of different sizes of AI squares gives rise to an absorption bandwidth of over 210 GHz with an absorption of over 90%. Our results also show that our device is almost polarization-insensitive. It works very well for all azimuthal angles with an absorption of beyond 80%.
We design and experimentally demonstrate a broadband metamaterial absorber in the terahertz （THz） band based on a periodic array of aluminum （A1） squares with two different sizes. A thin silicon dioxide （SiO2） film rather than a conventional polyimide （PI） layer is used as a dielectric spacer to separate A1 squares from the platinum （Pt） ground plane in our design, which significantly improves the design precision and the feasibility of the device fabrication. The combination of different sizes of AI squares gives rise to an absorption bandwidth of over 210 GHz with an absorption of over 90%. Our results also show that our device is almost polarization-insensitive. It works very well for all azimuthal angles with an absorption of beyond 80%.
基金
Project supported by the National Natural Science Foundation of China(Grant No.61131005)
the Key Project of the Chinese Ministry of Education(Grant No.313013)
the New Century Excellent Talent Foundation,China(Grant No.NCET-11-0068)
the Sichuan Youth Science and Technology Foundation,China(Grant No.2011JQ0001)
the Specialized Research Fund for the Doctoral Program of Higher Education,China(Grant No.20110185130002)
the THzScience and Technology Foundation from the China Academy of Engineering Physics,China(Grant No.CAEPTHZ201207)
