Optical Coatings Icon

Metal & Mirror Optical Thin Film Coatings

JNS precisely deposits enhanced aluminum and protected silver and additional reflective metals for numerous optical applications.  Precision reflective coatings from JNS offer stability of reflectance and polarization state over a broad range of angles. Precision reflective metal coatings from JNS can be used throughout the UV, VIS and IR spectral regions.

JNS can also add a di-electric overcoat to enhance the reflection and increase the durability of the coating.  This process of adding a di-electric overcoat is known as a protected metal mirror.

Protected Aluminum

Standard protected aluminum is our most popular mirror coating for applications in the visible and near infrared. A λ/2 coating of Silicon Monoxide (SiO) is typically used as an overcoat to protect the delicate aluminum. This treatment provides an abrasion-resistant surface while maintaining the performance of aluminum mirror.

Enhanced Aluminum

In an Enhanced Aluminum coating, a multi-layer film of dielectrics on top of aluminum is used to increase the reflectance in the visible or ultraviolet regions. This coating is ideal for applications requiring increased reflectance from 400 – 650nm while the UV and DUV Enhanced Aluminum coatings yield increased reflectance from 120 – 400nm range. The multi-layer film also provides the improved handling characteristics of the protected aluminum coating.

Protected Silver

Silver offers high reflectance in the visible and infrared spectral regions, making it an excellent choice for broadband applications that span multiple spectral regions. A protective coating reduces silver’s tendency to tarnish but the coating still performs best in low humidity environments.