Optimizing the polarization and antireflection characteristics of metallic wire grid structures in the Terahertz frequency range

The ever-increasing demand for high-quality quasi-optic components, such as phase shifters, filters, and polar-izers, has led to the exploration of new paradigms for structuring and patterning existing materials, as well as the search for novel materials. In this work, we have found a simple yet efficient way to boost the polarization efficiency of metallic wire grid polarizers made of gold by reducing the period of the wire grid structures. The thus fabricated metallic wire grids offer a degree of polarization as high as 94.3 % and an extinction ratio similar to 22.1 dB over a broad frequency range of 0.2-2.5 THz. Simultaneously, the thus prepared metallic wire grid structures also perform efficiently as anti-reflection coating materials, showcasing their versatility and multifunctionality. We believe that these durable, long-lasting, and low-maintenance metallic wire grid structures will meet the ever-lasting need for efficient THz polarizers.