Open AccessHigh extinction ratio terahertz wire-grid polarizers with connecting bridges on quartz substrates
Author(s) -
John S. Cetnar,
Shivashankar Vangala,
Weidong Zhang,
Carl Pfeiffer,
E. R. Brown,
Junpeng Guo
Publication year - 2017
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.42.000955
Subject(s) - polarizer , extinction ratio , terahertz radiation , materials science , optics , transmittance , optoelectronics , polarization (electrochemistry) , birefringence , physics , wavelength , chemistry
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-polarization transmittance of less than -3 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.