| Summary: | In the previous work, two new nematic liquid crystal (NLC) mixtures, E7-2 and S200-2, were produced by adding eight LC monomers to two commercial LCs S200 and E7, respectively. At λ = 589 nm, the birefringence (Δ<i>n</i>) characteristics of the two LC nematic mixtures E7-2 (Δ<i>n</i> = 0.260) and S200-2 (Δ<i>n</i> = 0.298) are greater than those of the commercial LC E7 (Δ<i>n</i> = 0.224) and S200 (Δ<i>n</i> = 0.266). The properties (<i>T</i><sub>N-I</sub>, <i>ε</i><sub>//</sub>, Δ<i>ɛ</i>, <i>K</i><sub>11</sub>, and <i>K</i><sub>33</sub>) of these four NLCs were measured. A double-layer metal loop arrays modulation structure based on metamaterial (MM) metal−dielectric−metal (MDM) was designed and fabricated for use in the THz frequency range. The results show that the LC mixtures E7-2 and S200-2 have greater modulation depth (<i>MD</i>) and less modulation insertion loss (<i>IL</i>) than E7 and S200 at THz frequencies. The results show that LC mixtures have significant potential for designing active tunable LC-based devices in the THz and visible light range.
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