|Download THz Polarizers Datasheet (PDF, 353 KB)|
For operation in FIR and THz regions we supply polyethylene polarizers designed to polarize radiation from 7 microns to MM waves. They are the sort of diffraction gratings and operate in transmission. The polarizer grating is made by forming grooves of a triangle profile on the substrate and subsequent deposition of a metal coating (aluminum) on one of the groove facets.
Advantages of polyethylene grid polarizers compared to free-standing wire grid polarizers:
Tab. 1 Parameters of polyethylene polarizers.
|Substrate material||Hard polyethylene (HDPE)|
|Spectral range, μm||>= 7|
|Typical operation aperture, mm||25|
|Standard holder size at typical aperture, mm||D34.9 x 7.9|
|Maximal operation aperture, mm||100*|
|Grooves per mm||1200|
|Transmission efficiency K1 (average), %||70 - 80|
|Transmission of unwanted radiation K2 , %||<1 @ 8 μm
<0.1 @ 30-1000 μm
|Degree of polarization (K1-K2)/(K1+ K2 ), %||>98 @ 8 μm
>99.5 @ 30-1000 μm
|Extinction ratio E=K1/(2 x K2)||35-40 @ 8 μm
350-400 @ 30-1000 μm
* For square shape polarizer maximal aperture size can be higher, up to 110 x 110 mm .
Sizes and shapes
Polyethylene polarizers are produced using the ruled grating technique.
The grid is ruled onto large size material, which is subsequently cut. Thus clear aperture can be round or, on customer's request – square or rectangular.
Standard clear aperture (CA) of polarizers is D25 mm, which is available from our stock.
For quotation and delivery please fill in our request form.