Abstract
In this paper, we present a novel design of an electrically tunable metamaterial device in the terahertz frequency range of 325–500 GHz. The device is analyzed and optimized using an equivalent circuit and numerical simulation. The experimental and simulation results are almost identical in the entire design frequency range. A maximum modulation depth of 90.87% is achieved in the transmission window. The bandpass width decreases from 102.55 to 28.7 GHz as the bias voltage increases from 0 to 30 V. This structure provides new insights into the potential of electrically tunable terahertz devices for a wide range of applications.
Highlights
Terahertz (THz) waves have shown great potential in the fields of high-speed wireless communication, biomedical imaging and sensor because of their many unique characteristics (Nagatsuma et al, 2016; Luo et al, 2019)
We propose a double-layer plasmonic metamaterial composed of symmetric trapezoidal slotted unit cells to demonstrate the transmission characteristics of liquid crystal (LC)-based metamaterial
The modulation depth is almost a constant when the applied bias voltage is less than 1 V, which is the threshold voltage required for the reorientation of liquid crystal molecules
Summary
Terahertz (THz) waves have shown great potential in the fields of high-speed wireless communication, biomedical imaging and sensor because of their many unique characteristics (Nagatsuma et al, 2016; Luo et al, 2019). Modulation depth (MD) are important parameters for judging the modulation capability of a device They can be calculated as follows for the proposed design: FIGURE 2 | (A) Parallel equivalent circuit model of the copper pattern. Due to the monotonic relationship between the dielectric constant and the transmission characteristics, the THz beam can be controlled flexibly and effectively by applying different bias voltages over the design frequency range. The bias voltage is an amplified 1 kHz square wave signal provided by the signal generator to prevent electric charge from accumulating in the sample
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