Single-shot terahertz polarization detection based on terahertz time-domain spectroscopy

Abstract

This paper presents a novel design for single-shot terahertz polarization detection based on terahertz time-domain spectroscopy (THz-TDS). Its validity has been confirmed by comparing its detection results with those of the THz common-path spectral interferometer through two separate measurements for the orthogonal components. Our results also show that its detection signal-to-noise ratios (SNRs) are obviously superior to those of the 45° optical bias THz-TDS by electro-optical sampling due to its operation on common-path spectral interference rather than the polarization-sensitive intensity modulation. The setup works without need of any optical scan, which does not only save time, but also efficiently avoids the disturbances from the fluctuations of the system and environment. Its single-shot mode allows it to work well for the applications with poor or no repeatability.

Wide-angle metalens array with quadratic phase for terahertz polarization detection

“…In 2024, Lin et al proposed a metasurface composed of four wide-angle metalenses to realize wide-field full-Stokes polarization imaging in the visible region [46], the supercell is adopted to eliminate the crosstalk between orthogonally polarized incident light, the design process becomes complicated due to the introduction of supercell. Terahertz wave is located between the microwave and infrared, accurate measurement of SOP of terahertz wave can contribute to the research of magneto-optical effect, material properties and chiral molecular/metamaterial identification [47,48]. There have been several endeavors to be devoted to the metasurface-based polarimeter in the terahertz region [49,50], but most of them only consider normally incident terahertz wave.…”

Frequency response of terahertz electro-optic sampling detection technology with thin GaSe crystal

“…In these methods, the EOS detection technology with simply optical setup, high detection sensitivity, and high signal-to-noise ratio in the low frequency band of terahertz waves, is nearly the standard coherent detection method, and can be used to calibrate the new broadband terahertz radiation source. It also has been improved to simultaneously detect the polarizations and the time wave-form of the terahertz pulse in a single-shot scheme [7].…”