Abstract-High extinction ratio terahertz wire-grid polarizers with connecting bridges on quartz substrates

John S. Cetnar, Shivashankar Vangala, Weidong Zhang, Carl Pfeiffer, Elliott R. Brown, and Junpeng Guo

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-42-5-955&origin=search

A terahertz (THz) wire-grid polarizer with metallic bridges on a quartz substrate was simulated, fabricated, and tested. The device functions as a wide-band polarizer to incident THz radiation. In addition, the metallic bridges permit the device to function as a transparent electrode when a DC bias is applied to it. Three design variations of the polarizer with bridges and a polarizer without bridges were studied. Results show the devices with bridges have average 𝑠$s$-polarization transmittance of less than −3  dB$-3\mathrm{dB}$ and average extinction ratios of approximately 40 dB across a frequency range of 220–990 GHz and thus are comparable to a polarizer without bridges.