Fabrication of freestanding THz band-pass filters

We present a fabrication concept for freestanding THz filters and other photonic elements. It uses a polymer film substrate onto which a designed metamaterial is processed using standard clean-room processes. Elements are framed to custom dimensions and shapes using 3D printing. The resulting freestanding elements are robust, easy to handle, and mountable. We assessed the performance of the fabricated band-pass filters using THz time-domain spectroscopy. The process is adaptable to other wavelength ranges and has the potential for upscaling in manufacturing.