Inkjet-printed silver-nanoparticle THz metamaterial

We demonstrate a simple and cost-effective method for fabricating silver-nanoparticle metamaterial structures on a flexible substrate based on inkjet printing. Specifically, we used inkjet printing with an ordinary printer to obtain an array of split-ring resonators (SRRs) on a sheet of paper. We designed the SRR array to exhibit a resonance in the THz region, which we observed through THz time-domain spectroscopy. We achieved good agreement between designed and measured THz transmission spectra for x- and j-polarized incident waves. In the measurement, we obtained the resonant frequencies of 0.305 THz and 0.137 THz for x- and j-polarized incident waves, respectively.