Electronic Science and Technology ›› 2022, Vol. 35 ›› Issue (6): 43-47.doi: 10.16180/j.cnki.issn1007-7820.2022.06.007

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Electrically Tunable Terahertz Metamaterial Absorber Based on Liquid Crystal

SHI Tian,XU Junjie,SUN Shuangyuan,YIN Mingjun,YANG Jun,YIN Zhiping   

  1. Academy of Opto-electric Technology,Hefei University of Technology,Hefei 230009,China
  • Received:2021-01-22 Online:2022-06-15 Published:2022-06-20
  • Supported by:
    National Natural Science Foundation of China(61871171)


A liquid crystal terahertz electronically controlled metamaterial absorber is designed to change the equivalent dielectric constant of the liquid crystal layer to realize the regulation of the terahertz reflected wave through an external electric field. The transmission performance of the device is calculated, and the surface current distribution and energy loss density at the resonance frequency are analyzed. By using ultraviolet lithography and wet etching technology, a 30×30 unit metamaterial absorber array is fabricated and verified. The results show that when the bias voltage is changed between 0 and 30 V, the resonance frequency of the absorber can be dynamically adjusted in the range of 101.5 to 117.95 GHz, and the comprehensive adjustable rate can reach 13.9%. In the working frequency band, the absorptivity of the proposed absorber is higher than 90%.

Key words: terahertz, metamaterial, absorber, liquid crystal, electrically tunable, absorptivity, ultraviolet lithography, permittivity

CLC Number: 

  • TN99