Fig. 1. (a) Schematic diagram and (b) optical picture of the home-made electrostatic jet printing system based on EHD principle

Fig. 2. Picture of a nozzle with an internal diameter of 500 μm producing a jet with the diameter of 4.4 μm (Scale bar is 300 μm)

Fig. 3. (a) A transparent metal grid sample with the line width of about 5 μm on a glass substrate (the scale bar is 200 μm and 50 μm); (b) Visible light transmission spectrum of the sample

Fig. 4. Complex patterns with discontinuous points printed on the glass substrate (Scale bar is 5 mm)

Fig. 5. Schematic of (a) structure and (b) equivalent circuit model of the multilayer terahertz absorber

Fig. 6. Absorption curves obtained by simulation, equivalent circuit calculation, and experimental results

Fig. 7. Picture of the terahertz absorber sample indicating the good optical transparency (Scale bar is 400 μm)

Fig. 8. Schematic of (a) unit structure and (b) the top schematic view of a terahertz polarization converter

Fig. 9. (a) Co- and cross-polarized reflectance and (b) polarization conversion rate of the terahertz polarization converter