Terahertz (THz) plays a pivotal part in numerous technology fields in modern times, including the system of the 6th generation wireless communication, imaging and elemental analysis. In addition to light sources and detectors, THz applications require quasi optics as lenses, waveguides, and reflectors for the design of a THz system. Three-dimensional (3D) printing has many advantages. However, 3D printing materials always have higher THz-wave absorption rates. In this study, we attempted to discover the optimum process parameters of the combustion temperature of rice husk ash (RHA) and mix RHA with acrylonitrile butadiene styrene (ABS). According to the THz spectrum, the mixture powder would be very useful in applications of 3D printing to increase the refractive index and decrease the absorption coefficient with RHA added into ABS. This improvement will benefit 3D printing technique applications in the far-infrared and THz range.
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