Infrared Wire Grid Polarizers
Wire grid polarizers are used for splitting and filtering infrared light into parallel and perpendicularly polarized beams, such as required for many kinds of reflectance FTIR spectroscopy, ellipsometry, and polarimetry measurements. Wire grids are suitable for broadband applications over a wide range of wavelengths. Specac manufacture two types: holographic and free-standing grids. The former are produced on various substrates for the 2 – 35 μm wavelength range; the latter are tightly wound around a supporting frame and are best suited to wavelengths greater than 50 μm.
Holographic IR Wire Grid Polarizers
Wire grid polarizers for the mid-infrared spectral range. SPECAC polarizers are available in a wide range of sizes and substrates to suit the required performance.
Free-Standing IR/THz Wire Grid Polarizers
These polarizers consist of an array of parallel 5 μm or 10 μm tungsten wires secured to a mounting frame with a wire spacing of 12.5 μm or 25 μm. These wires act to reflect the incident radiation electric field component parallel to the direction of the wires, and transmit the electric field component perpendicular to the wires. There is no use of substrates, so the performance is dependent on the diameter and spacing between wires. Operating wavelengths are from 20 μm to 10 mm; ideal for mid-infrared (MIR), far-infrared (FIR), and terahertz (THz) applications.
Holographic Polarizer Rotation Mounts
A slide-mounted (3″ x 2″) manual polarizer rotator mount with 1 degree angle gradations.
