Anti-reflective coatings reduce reflections, reduce first-surface optical losses, and increase contrast and optical transparency. Antireflection coatings are used to reduce specular reflectance and prevent light loss in optical systems.
Alfa Chemistry's coating skills enable us to create unique anti-reflective coatings for your application, with high adhesion and thermal durability on both conventional and non-standard substrates. If you are unsure how to develop your coating, our experts will assist you in finding the best design for your optical system.
Anti-reflective coatings are often made up of numerous layers of opposing refractive indices that alternate. Different coatings for different substrates are available based on the substrate material, size, and wavelength range. Our anti-reflective coatings are designed to work in both narrow and wide applications, with performance varied according to bandwidth and incidence angle. At near vertical incidence, our narrow-band antireflective coatings often achieve less than 0.03 percent front surface reflection. Maximum reflections will be higher in antireflection coatings designed for wider bandwidths.
Fig 1. Schematic illustration of diffusion of light in (a) single layer film (ns > n) and (b) multiple layer film. (Shanmugam N, et al. 2020)
The optical characteristics of narrow-band antireflective coatings are identical when deposited at low and high temperatures. Broadband antireflective coatings deposited at higher temperatures, on the other hand, yield lower average reflections over a given bandwidth, hence their performance varies with deposition temperature. Even on the most difficult polymeric substrates, our low temperature anti-reflective coatings are formulated and coated to assure high adhesion and thermal stability.
Our anti-reflective coatings have been used in a variety of applications, the most prevalent of which being lasers. To deposit high-power laser-resistant transmissive films, Alfa Chemistry typically uses ion beam sputtering or electron beam techniques.
Alfa Chemistry provides a comprehensive range of antireflective coating customization services. You can specify the wavelength range, substrate refractive index, angle of incidence, incident medium, and so on.
Glass Anti-Reflection Coatings
Alfa Chemistry sets up and customizes glass antireflective coatings for your specific application. Our coatings are designed for wavelengths between 200 and 2500 nm and can be applied to a range of glass substrates, including fused silica, precision glass optics, CaF2, BaF2, ultra-thin wafers, and more.
Fig 2. Classification of commonly used fabrication techniques for ARCs. (Shanmugam N, et al. 2020)
Anti-Reflection Coatings for Low-Temperature Optical Applications
Alfa Chemistry produces and customizes the anti-reflection coatings for your temperature sensitive substrates in a broad wavelength range. Our coatings are developed to deliver at wavelengths spanning from 300 to 2000 nm and can be applied to a wide range of cryogenic optics, including acrylic, styrene, COC, Fresnel lenses, and other materials.
IBS Anti-Reflection Coatings
Alfa Chemistry uses optical beam sputtering (IBS) technology to produce antireflective coatings for your unique application. The coatings include a highly aligned surface structure, exceptional surface quality, minimal optical loss, and a high laser damage threshold. The low sensitivity to moisture, which results in little or no spectrum shift, is one of the many advantages.
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