Laser-patterned foil offers low-cost alternative for terahertz polarization

Physicists have created wire-grid polarizers for terahertz radiation using laser-cut aluminum foil, drastically reducing costs compared to commercial devices. The inexpensive components could make terahertz experiments more accessible.

Terahertz radiation sits between microwaves and infrared, with uses in imaging, spectroscopy, and security screening. Polarizers, which filter specific wave orientations, are essential for many such experiments. Commercial wire-grid polarizers often rely on microfabrication techniques, making them costly. This new approach uses a laser to cut a fine grid directly into ordinary aluminum foil, producing a functional polarizer at a fraction of the price. The simplicity of the method means researchers with limited budgets could assemble their own components. While the summary does not specify performance metrics, the potential for widespread, low-cost production may lower the barrier to entry for university labs and startups exploring terahertz technologies.