A Review of Multilayer Thin Film Filters in the Infrared Region

Multilayers thin film structure is very promising and important structure for its unique properties such as electrical and optical properties. It is useful for both civil and military applications. Here, we conducted a concentrated review on the most important multilayers structures and their optical properties. Different structures have been introduced and proposed by researchers to provide new properties and solutions. Several approaches to design the multilayers structures. In addition to, different techniques for the fabrication. Usually using a substrate from specific material and coating with this film multilayer structure. This type of design will change the optical properties according to the coating material and thickness for each layer within the coating. Hence, this change may lead to reflect, absorb or transmit the incident light. Therefore, according to required optical application, the coating could be applied to reflect, absorbs or transmit the incident light. It might include all of them at the same time.