THz Polarizers

Download THz Polarizers Datasheet (PDF, 500 KB)



FIR-and-THz_Polarizers

We offer the following polarizer types operating in far IR and THz wavelength ranges:

1.  Polyethylene Polarizers*

These are transmission gratings. Polarizer grating is formed by triangular notches with one aluminum-coated facet.

*temporarily out of production

Effective transmittance (Max) and unwanted polarization transmittance (Min) of a polyethylene polarizer

Fig.  1. Effective transmittance (Max) and unwanted polarization transmittance (Min) of a polyethylene polarizer.



Degree of polarization by a polyethylene polarizer

Fig.  2. Degree of polarization by a polyethylene polarizer.

2. Polypropylene Polarizers

These are also transmission gratings, but produced using holographic technology (sine-shaped profile with partial aluminum coating).

Effective transmittance (Max) and unwanted polarization transmittance (Min) of a polyethylene polarizer

Fig.  3. Effective transmittance (Max) and unwanted polarization transmittance (Min) of a polypropylene polarizer.

Degree of polarization by a polypropylene polarizer

Fig.  4. Degree of polarization by a polypropylene polarizer.


3. Polarizers on Crystalline Quartz Substrates

These polarizers are produced by depositing gold dashes onto a plane crystalline quartz substrate of z-orientation.

Compared to film-based polarizers, crystal quartz-based polarizers have better properties in imagining optics and high-power laser applications.

 
Effective transmittance (Max) and unwanted polarization transmittance (Min) of a polyethylene polarizer

Fig.  5. Effective transmittance (Max) and unwanted polarization transmittance (Min) of a crystalline quartz-based polarizer.

Degree of polarization by crystalline quartz-based polarizer

Fig.  6. Degree of polarization by crystalline quartz-based polarizer.


 Data Sheet

Substrate material Polyethylene Polypropylene      Crystalline quartz 
Spectral range, μm >=15 >=15 >=100
Standard aperture, mm 25 25 25
Standard frame dimensions, mm L34.9x7.9 L40х8 L44х8
Maximum aperture, mm 50 50 38
Notches/dashes per mm 1200 1200 333
Effective transmittance K1, % 85-100 (avg. 91)
@15-500 μm

70-90 (avg. 80)
@15-1500 μm

70-80 (avg. 75)
@100-1500 μm

Unwanted polarization transmittance K2, % <1 up to 8 μm
<0.3 @15-600 μm
<1 @600-1500 μm

0.2 @15 μm
<0.3 @15-600 μm
<1 @600-1500 μm

<0.1 @100-500 μm
<1 @500-1500 μm

Degree of polarization P1=(K1-K2)/(K1+K2), %

98 @8 μm
>99 @15-500 μm
>98 @500-1500 μm

99.5 @15 μm
>96 @15-1500 μm

>98 @100-400 μm
>97 @400-1500 μm

Extinction coefficient E=K1/(2xK2)

100-1500 @15-300 μm
100-700 @300-1500 μm

100-10000 @15-500 μm
75-200 @500-1500 μm

200-5000 @150-300 μm
40-600 @300-1500 μm

Applications:

  •   THz microscopy;
  •   Studying molecule orientation in crystalline and polymer films;
  •   Imaging optics;
  •   Sensors and detectors;
  •   Fourier spectroscopy;
  •   THz spectroscopic studies.


Key properties:

  •   Can be used in a very wide wavelength range, from mid-IR to THz;
  •   High transmittance in far IR region;
  •   High degree of polarization;
  •   Polarizers are supplied in frames (protective rings marked with notch/dash direction).


Advantages of grating polarizers over metal mesh-based polarizers:

  •   Lower price;
  •   Single polarizer can be used in a wide wavelength range.

For price quotation and delivery please fill in our Request Form.