Flexible terahertz polarizer based on a dual-sided aluminum wire grid on a single-layer cyclo-olefin copolymer thin film.

Abstract

Terahertz (THz) photonics requires polarization-control components that combine high extinction, high transmission, mechanical flexibility, and scalable fabrication. Here, we demonstrate a flexible THz wire-grid polarizer based on aluminum gratings patterned on both sides of a 50 µm thick cyclo-olefin copolymer (COC) film. The thin, low-loss COC substrate reduces dielectric absorption, while the dual-sided grating geometry improves polarization discrimination. An extinction ratio of over 45 dB with transmittance exceeding 81% over the 0.5-1.5 THz frequency range has been achieved. This device achieves high optical performance with a simple, scalable, and mechanically conformable architecture, making it promising for THz spectroscopy, imaging, and communication applications.

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