Jie Ji, Siyan Zhou, Weijun Wang, Chunya Luo, Yong Liu, Furi Ling, and Jianquan Yao
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| Fig. 1 (a) The schematic of an efficient light modulator based on a frequency-selective tunable terahertz metasurface. The sample size was 15 mm*15mm. (b) the OM image of the sample when the photo-resist was lift off. (c) Geometry of the unit-cell of the metasurface with parameters: L1 = 120 um, L2 = 80 um, h1 = 30 um, h2 = 25 um, a = 30 um, g = w = 5um. Metal thickness for the metasurface: d = 100 nm (5 nm Ti + 95 nm Al). |
https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-27-3-2363&id=404331
An active multifunctional terahertz modulator based on plasmon-induced transparency (PIT) metasurface under the effect of external infrared light was investigated theoretically and experimentally. A distinct transparency window, which resulted from the near-field coupling between two resonators, could be observed in the transmission spectra. Experimental results showed a phenomenon infrared light induced blue shift on the both resonator with increasing optical powers. When the optical power was tuned from 0 mW to 400 mW, the amplitude tunability of transmission at transparency window reached to 34.01%, much larger than that at the two resonance frequencies. Moreover, the phase tunability of the transmission at 0.98 THz reached to 31.35%. Meanwhile, the amplitude variation was limited to 10%. Furthermore, a coupled Lorentz oscillator model was adopted to analyze the near-field interaction of the resonances. Experimental results were in good agreement with the analytical fitting results.
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