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High extinction ratio terahertz polarizer
Product Introduction
A terahertz polarizer or polarization grid is designed to convert arbitrarily polarized radiation into linearly polarized radiation.
Each polarizer consists of a metal stripe grid, with the stripes arranged at a lateral spacing of 8 micrometers on an ultra-thin terahertz-transparent polymer film at the top and mounted on an annular aluminum support. The deep subwavelength structure and extremely thin substrate of the polarization grid confer high attenuation coefficients for light parallel to the stripes (closed state), while achieving extremely low insertion loss across the entire terahertz spectrum for orthogonal light (open state).
The polarization grating is a "classical" optical component in most terahertz instruments and systems, with high demand in terahertz measurements. It can be used as a component of polarizers, polarimeters, polarization attenuators, or polarization converters.
We offer high-performance standalone polarizers in both single-grid and dual-grid (series) configurations. The latter features superior performance and is recommended for applications requiring exceptional polarization discrimination and low insertion loss.
#1 and #2 are two distinct single-gitter polarizers. Due to certain variations in material parameters, their characteristics cannot be identical. The tandem structure consists of two single-gitter polarizers combined: the gitters are arranged with parallel metal stripes and then bonded together.
Single-grid configuration: Orderable light aperture diameter: ∅43mm,∅52mm,∅77mm. The outer diameters are as follows: ∅51mm、∅64mm、∅85mm.
Two-grid configuration: Orderable light-transmitting aperture diameter: ∅40 mm,∅52 mm,∅77 mm. Their outer diameters are as follows: ∅51mm、∅69mm、∅90mm
(*#1 and #2 are single-raster structures; #1 + #2 are double-raster structures)
Figure 1: Typical Transmission Spectra of a THz Polarizer in the on (ON) and off (OFF) States.
Due to its low insertion loss (<0.5 dB @ 2.5 THz), the transmittance in the off state is nearly equal to the reciprocal of the extinction ratio. For dual-gate polarizers, the transmittance in the off state falls below the noise level of the employed time-domain spectrometer and cannot be measured directly.
