Decorative near-infrared transmission filters featuring high-efficiency and angular-insensitivity employing 1D photonic crystals

摘要

We present a new scheme for visibly-opaque but near-infrared-transmitting filters involving 7 layers based on one-dimensional ternary photonic crystals,with capabilities in reaching nearly 100％ transmission efficiency in the near-infrared region.Different decorative reflection colors can be created by adding additional three layers while maintaining the near-infrared transmission performance.In addition,our proposed structural colors show great angular insensitivity up to ±60° for both transverse electric and transverse magnetic polarizations,which are highly desired in various fields.The facile strategy described here involves a simple deposition method for the fabrication,thereby having great potential in diverse applications such as image sensors,anti-counterfeit tag,and optical measurement systems.