Multilayer angular optical filter as a smart window

The ability for controlling the light based on the angle of incidence played an essential role in many technological applications. In the present work, an angular optical filter consists of multilayers designed by Essential Macleod software within the visible and near-infrared regions. By using the transfer matrix method, we have obtained the transmission properties for the p-polarized light depending on the angle of incidence. The proposed filter can be easily used to control the transmission of visible and NIR light depending on the angle of incidence. Transmission of NIR at 1200 nm increases from 21.26 to 78.89% as the incident angle changed from 5 degrees to 55 degrees, respectively. Simultaneously, the transmission of the visible light is higher than 87%. These results may have a potential application in controlling the light and heat within the building, solar greenhouse, optical switch and other future applications. Also, the simplicity of the current structure makes it conducive to the industrial design using low-cost and massive product nanofabrication technique.