Liquid Crystal Terahertz Modulator Based on Double-layer Plasmonic Metamaterial

In this article, we have designed an electrically tunable terahertz (THz) device with a large amplitude modulation depth (MD) and low insertion loss (IL) in the frequency range of 220-330 GHz. The proposed device consists of two layers of metal metamaterial microstructures that are printed on a 200-micron thick quartz substrate, which is immersed in a liquid crystal layer. Calculation results show that the device has the best performance at 287.76 GHz. At this frequency, MD and IL are 89.6% and 0.88 dB, respectively. The designed structure provides a potential solution for electrically tunable THz devices.