在石英衬底上带有连接桥的高消光比太赫兹线栅偏振器。

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

作者信息

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

出版信息

Opt Lett. 2017 Mar 1;42(5):955-958. doi: 10.1364/OL.42.000955.

DOI:10.1364/OL.42.000955

Abstract

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.

摘要

对一种在石英衬底上带有金属桥的太赫兹（THz）线栅偏振器进行了模拟、制作和测试。该器件可作为宽带偏振器用于入射太赫兹辐射。此外，当给其施加直流偏置时，金属桥使该器件能够用作透明电极。研究了带桥偏振器的三种设计变体以及不带桥的偏振器。结果表明，带桥的器件在220 - 990 GHz频率范围内，平均s偏振透射率小于 -3 dB，平均消光比约为40 dB，因此与不带桥的偏振器相当。