  We demonstrate a practical scalable approach to the fabrication of tunable
metamaterials. Designed for THz wavelengths, the metamaterial is comprised of
polyurethane filled with an array of indium wires using the well-established
fiber drawing technique. Modification of the dimensions of the metamaterial
provides tunability: by compressing the metamaterial we demonstrated a 50%
plasma frequency shift using THz time domain spectroscopy. Releasing the
compression allowed the metamaterial to return to its original dimensions and
plasma frequency, demonstrating dynamic reversible tunability.
