A high extinction ratio THz polarizer fabricated by double-bilayer wire grid structure

Abstract

We designed a new style of broadband terahertz (THz) polarizer with double-bilayer wire grid structure by fabricating them on both sides of silicon substrate. This THz polarizer shows a high average extinction ratio of 60dB in 0.5 to 2.0 THz frequency range and the maximum of 87 dB at 1.06 THz, which is much higher than that of conventional monolayer wire grid polarizers and single-bilayer wire grid ones.

Optical Reconfigurable Terahertz Devices using Phase Change Materials

“…The strong contrast in THz amplitude signals transmitted through the GeTe films optically prepared in the two different states suggests that simple structures made only in GeTe (without additional metallic structures) could be feasible, offering interesting and promising opportunities for developing active THz reconfigurable devices. In particular, THz polarizers are essential devices, with critical roles in imaging and wireless communication applications [46][47][48][49] . For demonstrating the potential capabilities of the GeTe material for these applications,…”

Active meta polarizer for terahertz frequencies

“…Terahertz radiations, with their extraordinary advantages (large bandwidth, traveling in a line of sight, good penetration and non-ionizing) offer unprecedented capabilities in applications spanning from medical imaging 1 , security 2 , radar 3 , high-speed communications 4 to spectroscopy of complex molecular networks 5 . In particular, active polarizers play an important role in terahertz imaging and wireless communication systems, which are essential for improving imaging and communication qualities 6 , 7 . Recent technologies of adaptive control of propagating terahertz wave polarizations are based on meta-devices (collection of coupled identical meta-atoms) which modify their intrinsic overall topology through mechanical, optical, electrical and thermal stimuli 8 – 33 .…”

Ultra-Precision Replication Technology for Fabricating Spiral-Structure Metamaterial

“…Spiral-structure metamaterial (SSM) can modulate the beam of an electromagnetic plane wave into a spiral wave by controlling the spiral state of the electromagnetic wave. In this paper, we propose a method to fabricate the SSM in a wavelength range in 30 um ∼1 mm, which has an important application in many fields, such as quantum optics, communication, and sensing detection [1][2][3][4]. The relevant characteristic parameters require the fabrication between micro-machining and traditional machining.…”