IR Polarizers, THz Polarizers

Download IR Polarizers Datasheet (PDF, 552 KB)
Download THz Polarizers Datasheet (PDF, 264 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.

FIR-and-THz_Polarizers

Applications

  • THz microscopy
  • Molecular orientation studies of crystal and polymer films
  • Imaging
  • Sensors and detectors
  • FTIR spectroscopy
  • THz spectroscopy studies

Features

  • Used in extremely wide wavelength range from MIR (7 μm) to THz ( 3 mm and even more)
  • Substrate is high density polyethylene (HDPE)
  • High FIR transmission
  • High degree of polarization
  • Polarizers are supplied in holders (protective ring with marked grid direction)

Advantages of polyethylene grid polarizers compared to free-standing wire grid polarizers:

  • Lower cost
  • Possibility to use one polarizer for the wide wavelength range

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 .

Transmission efficiency

Transmission of unwanted radiation

Degree of polarization

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.