Flexible terahertz metasurface lens fabricated by ink-jet printing

In this paper, a flexible metasurface lens is proposed and demonstrated to realize beam focusing in the terahertz (THz) region. The designed metasurface lens consists of a series of silver paste rods on the film. Based on Pancharatnam-Berry phase, the modulation of phase of the scattered THz wave from 0 to 2π is realized by changing the azimuth angle of the silver paste rods. The metasurface lens is fabricated by ink-jet printing, and it has the advantages of high optical transparency and deformation. Meanwhile, due to the advantages of one-time forming and rapid processing, ink-jet printing is a very potential approach for processing of THz metasurface. Compared with the traditional lithography technology, it helps to reduce the processing flow and greatly reduce the processing cost.