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A Tunable Ultra-Broadband THz Absorber Based on a Phase Change Material

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Abstract

In this paper, by using a kind of phase change material, a tailored ultra-broadband THz metamaterial absorber is realized, which is based on vanadium dioxide (VO2). Compared with the prior works, the tunable absorption bandwidth can be obtained in the proposed tunable phase change material absorber (TPMA), which can be manipulated by the temperature. The absorption of such a TPMA goes beyond 90% in the frequency region 10.28–15.56 THz and its relative bandwidth is 40.9% when the temperature is equal to or larger than 68°C, and excellent frequency detectability also can be observed. However, when the temperature is less than 68°C, the present TPMA can act as a perfect reflector. The absorption also is investigated for oblique incidence, which shows that the proposed TPMA is incident angle-dependent. The relationships between the structure parameters and the features of absorption also are investigated. The distribution of current surface, the electric field and power loss density are used to elucidate the physical mechanism of such a TPMA. In addition, a reconfigurable device can be realized with such a TPMA by tailoring different temperatures.

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Authors and Affiliations

  1. College of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China

    Xin-ru Kong, Hai-feng Zhang & Ri-na Dao

  2. National Electronic Science and Technology Experimental Teaching Demonstrating Center, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China

    Hai-feng Zhang

  3. National Information and Electronic Technology Virtual Simulation Experiment Teaching Center, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China

    Hai-feng Zhang

  4. Key Laboratory of Radar Imaging and Microwave Photonics (Nanjing University of Aeronautics and Astronautics), Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Hai-feng Zhang

  5. State Key Laboratory of Millimeter Waves of Southeast University, Nanjing, 210096, China

    Hai-feng Zhang

  6. School of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China

    Hai-feng Zhang

Authors
  1. Xin-ru Kong
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  2. Hai-feng Zhang
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  3. Ri-na Dao
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Correspondence to Hai-feng Zhang.

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Kong, Xr., Zhang, Hf. & Dao, Rn. A Tunable Ultra-Broadband THz Absorber Based on a Phase Change Material. J. Electron. Mater. 48, 7040–7047 (2019). https://doi.org/10.1007/s11664-019-07511-0

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  • DOI: https://doi.org/10.1007/s11664-019-07511-0

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