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THz Polarizers
 
   
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THz Polarizers

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.

  • 货  号:GIPOF62-P
  • 品  牌:QPhotonics
  • 销售价:
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THz Polarizers

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.

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Applications

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

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  • Used in extremely wide wavelength range from MIR (7 ??) 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)
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Advantages of polyethylene grid polarizers compared to free-standing wire grid polarizers:

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  • Lower cost
  • Possibility to use one polarizer for the wide wavelength range
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Tab. 1 Parameters of polyethylene polarizers.

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Substrate materialHard polyethylene (HDPE)
Spectral range, ??>= 7
Typical operation aperture, mm25
Standard holder size at typical aperture, mmD34.9 x 7.9
Maximal operation aperture, mm100*
Grooves per mm1200
Transmission efficiency K1 (average), %70 - 80
Transmission of unwanted radiation K2 , %<1 @ 8 ?? 
<0.1 @ 30-1000 ??
Degree of polarization (K1-K2)/(K1+ K2 ), %>98 @ 8 ?? 
>99.5 @ 30-1000 ??
Extinction ratio E=K1/(2 x K2)35-40 @ 8 ?? 
350-400 @ 30-1000 ??

* For square shape polarizer maximal aperture size can be higher, up to 110 x 110 mm .

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nTransmission efficiency
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nTransmission of unwanted radiation

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nDegree of polarization

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Sizes and shapes

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Polyethylene polarizers are produced using the ruled grating technique.

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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.

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Standard clear aperture (CA) of polarizers is D25 mm, which is available from our stock.

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For quotation and delivery please fill in our request form.

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