Silicon lenses with HDPE anti-reflection coatings for low THz frequency range

Presented in this paper have been the design, fabrication, and testing of the high resistance floating-zone silicon (HRFZ-Si) optics with the anti-reflection (AR) high-density polyethylene (HDPE) coatings, for the low part of terahertz (THz) frequency range (ν ≈ 0.14 THz), by using the precision press molding. Experimental results of the transmission of the wafers and lenses with double-sided anti-reflection HDPE coatings for radiation frequency 0.14 THz showed an increase in the transmittance T values up to ≈1.45 times as compared to T magnitudes in wafers and lenses without HDPE coatings. The capability to use terahertz lenses with HDPE interference films and the technology of press molding, as a cheaper alternative to the horn antenna applications for the terahertz range of 0.14 THz was shown. With advancements in THz imaging and 6G communication technologies, further implementation of these Si optical elements is possible.