Abstract
Liquid crystals, which have high dielectric anisotropy even in the terahertz region and are easily controllable for dielectric permittivity by applying an electric field, have become increasingly attractive in recent years. The non-radiative dielectric (NRD) waveguide has a structure in which a dielectric line is sandwiched between two metal plates and by replacing the dielectric part with liquid crystal, a low loss liquid crystal-loaded NRD waveguide type terahertz phase shifter can be obtained. However, since the thickness of the liquid crystal layer is several hundred micrometers, it has a response time of as long as several hundred seconds when the driving voltage is removed. It is necessary to devise improvements for practical application. By inserting two polyethylene terephthalate (PET) films and reducing the thickness of the liquid crystal layer, the decay time was improved well, but the phase change was significantly reduced. In this study, we report improving both decay time and phase change with aligned nanofiber/liquid crystal complex. In addition, we demonstrate liquid crystal-load phase shifter, which has 360° phase change and the response time below one second.
Highlights
The speed of wireless transmission has been progressing, and the demand for large capacity and high-speed connection has increased
At the same driving voltage, 5CB and RDP-A3123 have almost the same rise terahertz wave is 350 GHz, the maximum phase change of 5CB can be calculated by using Equation time, but that of RDP-94990 is more than three times longer
Conclusions and confirmed that the non-radiative dielectric (NRD) waveguide works in the terahertz waveband with characteristics We observed the distribution of the electric field component of the terahertz wave by simulation such as low loss and non-radiation
Summary
The speed of wireless transmission has been progressing, and the demand for large capacity and high-speed connection has increased. With the development of satellite communication, a high-performance high-frequency band variable phase shifter is becoming increasingly required. Nematic LCs (NLCs) have high dielectric anisotropy, which exists in the terahertz wave region Because of their low level of orientation order, NLCs have low viscosity and good responsiveness to an electric field. Since their alignment can be controlled by an external electric field, a phase shifter that enables variable phase change, high-speed response, and electrical drive can be realized by using NLCs. In previous research, we had succeeded in realizing a LC-loaded non-radiative dielectric (NRD). The liquid crystal-load phase shifter, which has 360◦ phase change and the response time below one second, is demonstrated
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