Introduction to the characteristics and application fields of optical PET film:
One or more layers of film that are plated on the surface of an optical component to change the optical properties of the optical component surface are optical PET films.
The characteristics of the optical PET film are: the surface is smooth, the interface between the layers is geometrically divided; the refractive index of the film layer can jump at the interface, but it is continuous in the film layer; it can be a transparent medium, or it can be Absorbing medium; either normal or uniform. The actual application of the film is much more complicated than the ideal film. This is because the optical properties and physical properties of the film deviate from the bulk material during preparation, and the surface and interface are rough, resulting in diffuse scattering of the light beam; interpenetration between the film layers forms a diffusion interface; due to the growth of the film layer, The anisotropy of the film is formed by reasons such as structure and stress; the film layer has a complicated time effect.
Optical PET films are classified into reflective films, antireflection films, filter films, optical protective films, polarizing films, spectroscopic films, and phase films. The first four are commonly used. Optical reflective films are used to increase specular reflectance and are commonly used to fabricate reflective, refractive, and resonant cavity devices. An optical antireflection film is deposited on the surface of the optical element to reduce surface reflection and increase optical system transmission, also known as anti-reflection film. Optical filter films are used for spectral or other optical segmentation, and they are numerous and complex in structure. The optical protective film is deposited on the surface of a metal or other soft, erosive material or film to increase its strength or stability and to improve optical properties. The most common is the protective film of the metal mirror.
◆ The application of optical PET film is everywhere, from glasses coating to mobile phone, computer, TV LCD display to LED lighting, etc. It is full of all aspects of our lives and makes our life more colorful.
◆ Optical PET film can be divided into “geometric optics and physical optics”. Geometry optics is a geometric dielectric film formed by the surface of the optical device to change the optical path to achieve beam adjustment or redistribution; physical optics will The characteristic optical material elements in nature are nano-treated to the dielectric film layer formed on the surface of the desired optical device, and the characteristics of the optical material elements transmitted through the dielectric film layer are enhanced to change the functions of light polarization, transmission, reflection and the like.
◆ Generally, the preparation conditions of optical PET film are required to be high and precise, and the optical film is divided into dry preparation method and wet preparation method. Dry preparation method (including vacuum coating: evaporation plating, magnetron sputtering, ion plating, etc.) is generally used for The preparation of physical optical films, wet preparation methods (including coating, casting, thermoplastic, etc.) are generally used for the preparation of geometric optical films.

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