Wire Grid Polarizers

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The highly efficient Harrick Wire Grid Polarizer consists of a wire grid that is holographically deposited onto a KRS-5 substrate. This polarizer has a wide spectral range from 5000 cm⁻¹ to 285 cm⁻¹. The thin profile of this polarizer makes it convenient for applications in which there are space constraints. The general-purpose model is mounted into a fully 0° to 360° rotatable slide plate. Accessory-specific configurations of this polarizer are designed to fit the Harrick Seagull, VariGATR/GATR, and FastIR accessories. This polarizer is ideal for removing interference fringes from transmission spectra recorded at Brewster’s angle and excellent for obtaining optimum sensitivity for reflectance measurements.

Wire Grid Polarizer
Slide plate mounted FTIR polarizer (KRS-5 substrate)
Model No.
PWG-U1R
Price
N/A
NOTE: A Model No. ending in "XXX" denotes spectrometer code.

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Features
  • Wavelength range: 5000 cm-1 to 285 cm-1.
  • KRS-5 Substrate.
  • High extinction ratio.
  • Clear Aperture: 22 mm in diameter.
  • General purpose model slide plate mounted in a fully rotatable (0° to 360°) holder with an angular scale.
  • Accessory-specific models with a two-position holder (0° and 90°) provide p- and s- polarization.
 
Model No. Product Description Price
BXH-S1G Brewster's Angle Sample Holder

Variable angle transmission accessory for UV-Vis and FTIR

N/A
HON-L-XXX Horizon™ Liquid Sampler

Multiple reflection, ZnSe ATR with trough

N/A
HON-S-XXX Horizon™ Solid Sampler

Multiple reflection, ZnSe ATR with pressure applicator

N/A
RGR-XXX-3 RefractorReactor™

Grazing angle specular reflection, Variable Temperature and Pressure, 24V

N/A
VAT2-XXX Variable Angle Transmission Accessory

Transmission measurements of solids up to 6mm thick

N/A
VRX-XXX Variable Angle Reflection Accessory

Variable angle specular reflection accessory

N/A
 
Model No. Product Description Price
PWD-FAS-XXX Wire Grid Polarizer, FastIR FastIR Polarizer (KRS-5 Substrate), includes mount N/A
PWD-FAS-XXX Wire Grid Polarizer, FastIR FastIR Polarizer (KRS-5 Substrate), includes mount N/A
PWD-GATR-XXX Wire Grid Polarizer, VariGATR VariGATR Polarizer (KRS-5 Substrate), includes mount N/A
PWD-GATR-XXX Wire Grid Polarizer, VariGATR VariGATR Polarizer (KRS-5 Substrate), includes mount N/A
PWG-SEA Wire Grid Polarizer, Seagull Seagull™ FTIR polarizer (KRS-5 Substrate) N/A
Wire Grid Polarizer

The Wire Grid Polarizer consists of regularly spaced thin strips of parallel conductive wires. When the polarizer is placed perpendicular to the incoming radiation, the wires transmit the component of the electric field that is perpendicular to the wires, and reflect the component parallel to the wires.

The efficiency of a wire grid polarizer depends on the conductivity of the wire and also on the ratio of the grid spacing (d) to the wavelength of interest (λ). In theory, all types of parallel grids are efficient polarizers when the ratio of the grid spacing to the wavelength of interest (d/λ) is <<1. In practice, good agreement is obtained between measured and theoretical values when d/ λ <0.5 and when higher conductivity wires are used.

Polarizer performance is generally characterized by:

  • K1: The transmission efficiency for normal incidence polarized light whose electric field vector is perpendicular to the wires, also known as the wanted component. For a perfect polarizer, K1=1.
  • K2: The transmission efficiency for normal incidence polarized light whose electric field vector is parallel to the wires, also known as the unwanted component. For a perfect polarizer, K2=0.

Other commonly used measures of performance deduced from K1 and K2 are the degree of polarization or efficiency and the extinction ratio, whose formulas are shown in Table 1.

Table 1: Wire Grid Polarizer (KRS-5 substrate) Specifications.

Our Wire Grid Polarizer offers high efficiency in a compact form. With its holographically deposited wire grid on a KRS-5 substrate, it is suitable for use from 5000cm-1 to 285cm-1. Table 1 summarizes its specifications. The transmission efficiency from the wanted and unwanted components, in addition to the degree of polarization and extinction ratio, from a typical polarizer are shown in Figures 1 and 2 respectively. Note that there are some artifacts from the manufacturing process that appear as absorption bands in the wanted component (K1, Table 1).

Figure 1. Transmission efficiency for the wanted (K1) and unwanted (K2) components of a typical wire grid polarizer (KRS-5 substrate).

Figure 2. Degree of polarization (efficiency) and extinction ratio of a typical wire grid polarizer (KRS-5 substrate).