Abstract
We achieve a frequency-switchable and amplitude-tunable terahertz metamaterial absorber (MMA) by means of introducing two different controlling degrees of freedom. Frequency-switchable function is controlled by external laser excitation, and amplitude-tunable function is controlled by the incident polarization angle. Two discrete resonance peaks can be detected, and the causes are investigated. With and without laser excitation, the absorption peak in the low-frequency band can dynamically switch between 1.285 and 1.295 THz and, in the high-frequency band, the one can dynamically switch between 2.845 and 2.42 THz. Meanwhile, the absorber is polarization sensitive for its symmetry structure. By rotating the device clockwise, an amplitude modulation depth of 13% can be obtained for the resonance absorption peak in the low-frequency band, and it is up to 100% for the one in the high-frequency band. Therefore, the amplitude dynamic modulation is realized at the same time as frequency switching, which provides a new approach for future terahertz devices possessing the characteristics of multifunction, portability, and intelligence.
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Li, Y., Wang, X. Laser-Excited Frequency-Switchable and Polarization-Controlled Amplitude-Tunable Terahertz Metamaterial Absorber. J Russ Laser Res 43, 346–353 (2022). https://doi.org/10.1007/s10946-022-10058-x
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DOI: https://doi.org/10.1007/s10946-022-10058-x