Margherita M. P. Colleoni; Qian Wang; Jing Liu; Borja Vidal
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10103/101031T/Printing-sub-THz-wire-grid-polarizers-using-a-composite-liquid/10.1117/12.2251491.pdf?SSO=1
A low-cost method to ink-jet print terahertz
polarizers is presented. A liquid metal printer is used to deliver an eutectic
Gallium and Indium alloy (EGaIn24.5) onto polyvinyl chloride film substrates to
create flexible wire grid polarizers (10 x 20 mm) in the sub-THz band with a
nominal pitch of 200 μm and 300 μm, respectively. A Terahertz Time Domain
Spectroscopy (THz-TDS) setup has been used to characterize the polarizers. The
experimental results have been compared with FIT (Finite Integration Technique)
simulations (CST Studio) showing good agreement. The characterization of the
polarizers shows an extinction ratio up to 14 dB in the 0.1-0.7 THz and low
loss (<1 dB). A microscopic characterization of the polarizers shows a
variance in the line spacing of about 9%. This fabrication method allows a
quick and cost-effective approach for the development of sub-THz polarizers to
be used in polarization-resolved spectroscopy, polarimetric quality monitoring
sensors and the characterization of THz components.
