Linear polarizing film

Linear polarizing film is a specialized film that only transmits light waves aligned with its polarization plane (see also: polarization). Light passing through the film becomes linearly polarized.

If we compare the polarizing film’s grid filter to the “teeth of a comb,” only waves vibrating along the “teeth” will pass through, while those vibrating perpendicular will be blocked. Of course, like all phenomena occurring at the microscopic level, for such a filter to work, the actual spacing between the “teeth” must be extremely small. This requirement makes manufacturing an effective polarizing film a highly complex technological process.

The film converts unpolarized light into a linearly polarized wave.

Linear polarizing film has a structure resembling micro-louvers. The width of the gaps in this structure must be precisely adjusted to the wavelength of the light wave, requiring a highly complex manufacturing process.

It works on the principle of selective transmission – the film only passes light waves aligned with its polarization direction, while other components of the electromagnetic wave are blocked.

The film is easy to process; it can be cut using a special knife or ordinary scissors.

The film has a special water-activated adhesive applied on the inner side, so no additional components are needed to apply it. The film can be mounted on glass and other similar flat materials (organic glass, acrylic, plexiglass).

Installation is fully reversible; the film can be removed without damaging the surface it was applied to.

On the outer side, the film has a protective layer that guards against scratches. The property of selectively blocking certain types of electromagnetic waves by the polarizing film gives it many diverse applications. The primary use of the film is the elimination of light reflections that occur when light reflects off a flat surface.
Light reflected from wet asphalt – photo without polarizing film
Light reflected from wet asphalt – photo with polarizing film

Film as a polarizing filter

Such a reflection consists of partially or fully polarized light. Therefore, if we place a polarizing film with a polarizer oriented perpendicular to this wave in the path of the light, the film will remove the entire reflection. Polarizing films are used to make all kinds of anti-reflective filters, glasses with polarizing filters, and shields that eliminate reflections and light glare in industrial cameras. Polarizing film is also used as a polarizer for LCD displays and LCD projectors, to create 3D effects for DLP or LCD projectors, and in photography as a polarizing filter.