Tunable metamaterial absorber based on resonant strontium titanate artificial atoms

doi:10.1016/j.jmst.2020.03.082

J. Mater. Sci. Technol. ›› 2021, Vol. 62: 249-253.DOI: 10.1016/j.jmst.2020.03.082

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Tunable metamaterial absorber based on resonant strontium titanate artificial atoms

Xiaoming Liu^a^,^b, Zhiyu Ren^a^,^b, Tian Yang, Luping Chen^a^,^b, Qiang Wang^a^,^b^,^*(), Ji Zhou^**()

^aKey Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang, 110819, China
^aDepartment of New Energy Science & Engineering, School of Metallurgy, Northeastern University, Shenyang, 110819, China
^bDepartment of New Energy Science & Engineering, School of Metallurgy, Northeastern University, Shenyang, 110819, China
^bState Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

Received:2019-12-30 Published:2021-01-30 Online:2021-02-01
Contact: Qiang Wang,Ji Zhou
About author:** E-mail addresses: zhouji@mail.tsinghua.edu.cn (J. Zhou).
* Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang, 110819, China. E-mail addresses: wangq@epm.neu.edu.cn (Q. Wang),

Abstract

Abstract:

Dynamic control of the absorption frequency and intensity of metamaterial absorbers has attracted considerable attention, and many kinds of tunable metamaterial absorbers have been proposed. Unfortunately, due to the integration of separate resonant unit and tunable unit, these designed metamaterial absorbers suffer from complex structure and low sensitivity. We numerically and experimentally demonstrate a tunable metamaterial absorber composed of artificial dielectric atoms as both resonant and tunable unit arrayed periodically in the background matrix on the metallic plate. Polarization insensitive and wide incident angle absorption band with simulated and experimental absorptivity of 99 % and 96 % at 9.65 GHz are achieved at room temperature. The absorption frequency can be gradually modulated by temperature, however, the absorption intensity at working frequency remains near unity. The dielectric atoms based tunable metamaterial absorbers with simple structure have potential applications as temperature sensors and frequency selective thermal emitters.

Xiaoming Liu, Zhiyu Ren, Tian Yang, Luping Chen, Qiang Wang, Ji Zhou. Tunable metamaterial absorber based on resonant strontium titanate artificial atoms[J]. J. Mater. Sci. Technol., 2021, 62: 249-253.

Figures/Tables 4

Fig. 1. Unit cell of the designed dielectric metamaterial absorber and the absorptivity spectra with polarization angle φ and incident angle θ at room temperature.

Fig. 2. Electric (a) and magnetic (b) field distributions in the dielectric atoms at 9.56 GHz when the polarization angle φ is 0°, 45°, and 90° at room temperature. (c) The frequency-dependent input impedance versus temperature from 292 K to 302 K. The insets show the electric field distributions in the dielectric cube at 9.56 GHz and 9.54 GHz when Re(Z)=Re(Z0) = 1 at room temperature.

Fig. 3. Absorptivity spectra with temperature changing from 292 K to 302 K. (a) The numerial absorptivity spectra. The insets show the real and imaginary parts of STO. (b) The experimental absorptivity spectra.

Fig. 4. Experimental measurement. (a) Dielectric metamaterial absorber sample. (b) The experimental measuring environment.

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Tunable metamaterial absorber based on resonant strontium titanate artificial atoms

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