Polarization-variable emitter for terahertz time-domain spectroscopy

Abstract

We report on the progress in the development of linear polarization-variable multi-electrode emitters for terahertz time-domain spectroscopy. The results on its microfabrication, the finite element method modeling of appropriate bias distribution between electrodes, the finite-difference time-domain simulated spectral output, and actual experimental testing are presented. The rotation of the emitted terahertz field with linear polarization on an angle multiple of 45° can be achieved by synchronized bias and single polarizer rotations.

Dual polarization THz time domain spectroscopy system

“…For example, a novel threecontact photoconductive detector [7][8][9][10][11] was developed to simplify the direct detection of polarized signals. This was then replicated and improved in many other works [12][13][14][15][16][17][18] all compared in Fig. 1.…”

A dual-port THz Time Domain Spectroscopy System optimized for recovery of a sample’s Jones matrix

“…With the rapid development of THz radiation generation and detection technology, THz time-domain spectroscopy (THz-TDS) has rapidly matured over the last 30 years 1–4 and has become of mainstream use in research (medical and material science) as well as in industrial applications. At the same time, this has pushed the development of THz emitters 5–9 and detectors 10–15 , improving systems significantly due to advances in device fabrication. Polarization sensitive THz spectroscopy has attracted the interest of researchers due to the importance of the anisotropic dielectric properties of materials in chemical, physical and biochemical fields 16–19 .…”